502 Stimpson on the Crustacea and Echinodermata 



PANDALUS HYPSINOTUS. Brandt. 

 Pandalus hypsinotus, Brandt; Sibirische Reise, i. 125. 



Hah. Unalaschka, (Wosnessenski.) 



Mns. Acad. Petrop. 



The preceding four species appear to resemble each other 

 closely, and may perhaps be reduced to two upon more 

 careful examinations of numerous individuals. Having no 

 specimens of any of them, I have preferred to follow pre- 

 vious authors rather than to attempt identifications from 

 descriptions alone. 



PANDALUS DAM. Stimpson. 



PI. XXI. f. 6, 7. 

 Pandalus Dance, Stimpson; Proc. Bost. Soc. Nat. Hist. vi. 87. 



Thorax glabrous. Twelve teeth on the superior edge of 

 the rostrum, including the dorsal crest, the posterior one 

 being at about the middle of the carapax. Rostrum smooth 

 above near its trifid apex, and six-toothed below, the basal 

 tooth being large and much curved. Feet spinulose ; the 

 spinules on the third joints few and distant. Length two 

 and five tenths inches. 



This species differs from all of those above mentioned in 

 the much smaller number of teeth on the dorsal crest. The 

 trifid apex is also quite characteristic. 



Dredged opposite Fort Townsend, in Puget Sound, by 

 Capt. Murden, of the cutter "Jefferson Davis." This, with 

 several other species of great interest, were forwarded by 

 Dr. Suckley. 



Mus. Smithsonian ; Phil. Acad. 



PAL^MON BRACHYDACTYLUS. Wiegmann. 

 Palsemon brachydactylus, Wiegmann; Arckiofiir Naturgeschichte, 1836, i. 148. 



Inhabits the fresh waters of Western Mexico. 

 Mus. Berlin. 



