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SOME NEW DEEP SEA CRUSTACEANS-BENEDICT. 245 in species having an armature of v^ery small spines, as if chance conditions more easily pushed aside the less emphatic character. In old specimens of some species (and perhaps of all) the spines have a tendency to become blunted or even aborted, the chelipeds to become elongated, and the lingers to be separated })y a hiatus. The relative lengths of the supraocular spines are as a rule uniform, and, in connection with others, furnish a very good character. The size and arrangement of the spines of the carapace and also of the abdomen, if armed, are important. Correlated with other characters, the width of the lines of the carapace, the length and character of the cilia, and the size of the granules are of value in determining species. Some of the species in the U. S. National Museum are represented by but few specimens or even single individuals. In other cases the representation is greater. Large numbers of Miiuida iris A. Milne-Edwards, were taken on the tile-fish grounds during the first years work of the U. S. Fish Commission steamer J^ish Ilmvk. So numerous in fact was this Munida that it gave character to the ground. Yet two years later, when the Albatross went over the same ground, the hauls of the beam trawl showed that this species, formerly so abundant, was wanting. Three degrees farther south, however, in latitude 87°north, numerous specimens were found. I NO. 1311. SOME NEW DEEP SEA CRUSTACEANS-BENEDICT. 247 e. Palm narrow. /. Spines of rostrum weak andrev:si, p. 300 /. Spines of rostrum strong intermedia, p. 302 d. Row of nine or ten spines on the palm of the hand orientalh, p. 302 c. Two pairs of spines on the rostrum beyond the basal \>di\r .califormenshy p. 247 a. With more than two spines or spinules on the front of the gastric area or none. I). With a row of spinules on the front of the gastric area. c. Rostrum entire lieyond the l)asal spines integra, p. 248 c. Rostrum armed. d. lines on the carapace strong, elevated, few rostrata, p. 303 d. Lines but little elevated, more numerous intermedia, p. 302 b. Without a row of spinules on the front of the gastric area. c. Spines on the rostrum weak or none. d. No spines on the rostrum beyond the basal pair agassizi, p. 300 (/. With spines on the rostrum beyond the basal pair pauciUneata, p. 249 c. Spines on the rostrum large dispersa and nexa, pp. 301, 302

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Typical species Eupagurus splendescens (Owen). Eupagurus with the manus of the left cbeliped cylindrical. Under this section I have included but three species, the type, E. mertensi Brandt, and E. parvus nov. Subgenus EUPAGURUS. Eupagurus alaskensis. Anterior portion of carapace a little broader than long. Kostral tooth produced to the base of the eye scales; lateral projections much less produced. Eye-stalks short and stout, constricted in the middle. The eye scales taper from the base to a blunt apex; the subtermiual spine is conspicuous from above. The acicles of the antenna? reach the proximal end of the flagella and are three-sided ; sides flat, iridescent. V 18P2 XV ] PROCEEDINGS OF THE NATIONAL MUSEUM. 3 on the outer distal margins and on the inner upper surface of the merus joints of the cbeliped. The lower outer surface of the carpal joints of the ambulatory legs are pointed with red. The propodal joints and dactyls are longitudinally streaked with red. This species is very close to bernhardus, but is easily distinguished by its broader and shorter left hand, by the wide dactyls of the ambulatory legs, by the acicula, and by its pearly iridescence. Alaska. Eupagurus aleuticus. Front with three teeth sharper and a little more prominent than in alaskensis.

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