450 Stimpson on the Crustacea and Echinodermata 
dredged on a muddy bottom at the depth of thirty fathoms, 
off Cape Romanzoff. It was also found in Behring's 
Straits, by Commodore Ropeerrs, of the North Pacific 
Expedition. 
It is in the Museums of the Boston Society of Natural 
History, of the Smithsonian Institution, and of the Jardin 
des Plantes." 
HYAS COARCTATUS. Leach. 
Hyas coarctatus, Leacu; Malac. Pod. Brit, Pl. XXI. b. Mirxz-Epnwanps; Hist. 
at. des Crust., i. 312. BRANDT; Sibirische Reise, i. 79 
anded off Cape Romanzoff by the North Pacific Ex- 
pedition 
This is an arctic species, found on both boreal shores of 
the Atlantic. It is also the most common crab found in 
Behring's Straits, and is reported to exist on the shores of 
Kamtschatka and in the Sea of Ochotsk. 
Mus. Smithsonian. 
HYAS LYRATUS. Dana. 
Hyas lyratus, Dawa; U. S. Exploring Expedition, Crust. i. 86, PL L f. 1. 
Distinguished from the preceding species by the broad, 
wing-like, antero-lateral expansions of the carapax. It in- 
* As it is always desirable to know where typical specimens may be found for 
comparison, I shall indicate in every case the different museums in which exam- 
ples of the species herein catalogued are deposited. For convenience, the fol- 
lowing abbreviations will be used :— 
Posen of the Boston Society of bones History . Mus. Bost. Soc. 
* * Smithsonian Instit . * Smithsonian. 
*  * * Philadelphia aly eters ‘of Natural Sciences « Phil Acad. 
‘6 go onc Exploring Expeditio Er Expl. Exped. 
" . " California Academy of Natural Sciences a Cal. Acad 
e 
mno c Yale Colligo ter trop. 
" —— M" Imperial Academy of St. Petersburg due Acad. P 
etes | | Berin 
" |. * the Garden of Plants E Paris i iu. 05 PNE 
*  * * Royal College of Surgeons, London oe R. C. S. 
*  * * Zoólogical Society of London . - +: ` Zoöl. Boc. 
Dub Miun =- . .-. 4H E cwm 7 
