412 



distinct families necessary. He would place the Discoboli not at 

 all with Gobius, but in the neighborhood of the sculpins. He pre- 

 sented to the Society specimens of three new genera of this fam- 

 ily, as follows : Crossognathus, Ag., from Charleston, S. Carolina ; 

 Lobognathus, Ag., from Peru ; and Plychoclieilus, Ag., from 

 Puget Sound. 



The following communication was received from Mr. 

 William Stimpson : — 



Smithsonian Institution, Washington, D. C, Oct. 1, 1858. 

 I wish to place on record in the Proceedings of the Society the 

 existence of a remarkable new form of Brachyurous Crustacean 

 on the coral reefs at Hawaii. It cannot be properly I'eferred to 

 any known family, although having perhaps more resemblance to 

 Pinnotheres than any other known genus, as its integuments ai-e 

 soft, and the female abdomen of great size, — in fact larger than 

 the carapax. Its place in the series is pi'obably between Pin- 

 notheres and Hymenosoma. Four specimens only are in my 

 possession, which are, unfortunately, all females. They were 

 collected by the scientific corps of the U. S. North Pacific Sur- 

 veying Expedition, under the command of Capt. John Rodgers. 

 It may be called 



HAPALOCARCINUS MARSUPIALIS. 



The shell or general integument of the body is but little indu- 

 rated, quite soft and flexible, such as occurs after moulting in 

 other crabs. The feet however, particularly the chelipeds, are 

 sufficiently firm. The carapax is leather depressed, smooth, and 

 glabrous, suboval, longer than broad, narrower in front than be- 

 hind, somewhat truncated at either extremity, and without teeth 

 or spines on any part. Front horizontal, straight. Orbits small, 

 excavated in the anterior margin. Eyes short, oblique, inclining 

 to longitudinal, and scarcely retractile. Antennula3 very short 

 and minute, placed at the inner angle of the orbit. The epis- 

 tome is scarcely distinct, as the lamelliform maxiUipeds reach 

 nearly to the eyes and antenna?. The buccal area occupies the 

 whole breadth of the carapax anteriorly, the outer maxillipeds 

 covering the subhepatic regions. The maxillipeds are loosely 

 applied, as in some Anomoura, and those of the two sides are 



