NATURAL SCIENCES OP PHILADELPHIA. 153 



June 2Ls. 

 Yice-President Bridges in the Chair. 

 Fourteen members present. 



June 28<&. 

 Dr. Carson in the Chair. 



Eleven members present. 



A letter was read from Thos. B. Wilson, M. D., of date June 28th, 

 1864, tendering his resignation as President of the Academy. 



On report of the respective committees, the following papers were 

 ordered to be published in the Proceedings : 



Descriptions of new species of Marine INVEBTEBBATA from Puget Sound, 

 collected by the Naturalists of the North-west Boundary Commission, A. H. 

 Campbell, Esq., Commissioner. 



BY DR. WM. STIMPSON. 



The following descriptions are extracted, by permission, from the Zoological Report of tho Boun- 

 dary Commission. They were written in the year 1860, and accompanied by illustrative drawings 

 of all the species, which, It may be hoped, will suon be published. 



CRUSTACEA. 



ECPAGURUS KeNNKRLYI. 



Carapax smooth, except where the seta? are attached. Median tooth of the 

 front nearly obsolete ; lateral teeth small but sharp and well-marked. Eyes 

 moderately long and slender, but not longer than the peduncle of the outer 

 antennae ; cornea little dilated, with a tuft of hair at the apex. Acicles small, 

 pilose, not reaching the tips of the eyes. Feet all very hairy. Chelipeds 

 short and stout, both falling considerably short of the extremities of the am- 

 bulatory feet, and strongly but not very thickly armed with short spines. 

 In the greater cheliped the carpus is about as long as the palm of the hand ; 

 fingers shorter than the palm ; two distinct rows of sharp tubercles on the 

 dactylus. Smaller cheliped hardly reaching to the middle of the dactylus of 

 the greater one, convex, or with an obtuse median carina armed with strong 

 spines. There are no prominent spines or tubercles on the inferior surface 

 of the merus and carpus in either cheliped. Color of hands in alcoholic spe- 

 cimens light red. 



Length 2 inches ; length of carapax, 0*4; of right carpus and hand together 

 0-51 inch. 



An orthodactyle species, near E. pubescentulus, but with shorter and strongly 

 spinous chelipeds. We have named it after the late lamented naturalist who 

 discovered it. 



HlPPOLYTE PRIONOTA. 



A short, plump species. Carapax with a high, compressed back, crested 

 nearly the whole length, somewhat channelled longitudinally on each side 

 near the crest, and armed with three spines in a longitudinal row above 

 and behind the eyes ; also with a strong antennal and a pterygostomian spine. 

 Dorsal crest not sharp and lamelliform, but armed with four strong teeth, the 

 front edges of which are beset with aculei, which, especially in the posterior 

 teeth, form a transverse row when viewed from above. Rostrum more than 

 half as long as the carapax, lamelliform, very broad, though not as broad as 



1864.] 



