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The name of the type species of each genus and subgenus is given next following the generic name with its accompanying author and date, or after entries needed for definition of the name if it is involved in homonymy. The originally published combination of generic and trivial names for this species is cited, accompanied by an asterisk (to), with notation of the author and date of original publication. An exception in this procedure is made, however, if the species was first published in the same

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INDO-PACIFIC SPECIES OFTHE GENUS DISTICHOPORA size of the gastropores (whether large or small), and to the configuration of the ampullae.When taken in a general sense, the relative depth of the sulcus in many instances indeed furnishes a character of specific importance.

The collection of the United States National Museum contains among a large number of other specimens, which for the greater part are representatives of previously described genera, one that is remark- In general structure Briarosaccus reminds one strongly of that of Peltogaster, from which it differs chiefly in the relative narrowness of the mesentery, the more complicated structure of the colleteric glands, and in its peculiar retinacula. The mesentery which joins the mantle to the visceral mass in Peltogaster is very broad (Boschma, 1928, fig. 4), having the breadth of one-fourth or more of the surface of the latter. Consequently it can not be compared directly with that in the Sacculinidae, in which there is a narrow ligament connect-