10 Crustacea and Echinodermata of the 



hyas coakctatus. Leach. 



Hyas coarctatus, Leach ; Malac. Pod. Brit., PL XXI. b. Milne-Edwards ; Hist. 

 Nat. des Crust., i. 312. Brandt; Sibirische Reise, i. 79. 



Dredged 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 lyratns. Dana : T r . S. Exploring Expedition, Crust, i. 86, PL I. f. 1. 



Distinguished from the preceding species by the broad, 

 wing-like, antero-lateral expansions of the carapax. It in- 

 habits deep water on the coast of Oregon, where it was 

 found by the U. S. Exploring Expedition. 



Mus. Expl. Expedition. 



BERBSTIA PABVIFEONS. Randall. 



Herbfitia parvifrons, Randall; Journal of the Academy of Natural Sciences of 

 Philadelphia, viii. l<>7. Gibbeb; Proceedings of the American Association for the 

 Advana m ,,t oj >■ u no , 1 850. p. 1 70. 



" Western America." (Nuttall.) This species I have 

 not seen. 



LOXORHYNCHUS. nov. gen. 



Carapax piriformis, plus minusve spinosus et pubescens ; regione stomacbali 

 ampla, convexa ; regionibaa hcpaticis parvis, promincntibus, spina una saltern 

 valida in medio armatis. Rostrum biritlum, plus minusve dcflexum ; cornu- 

 bns divaricatis. Orbita imperfecta, supra infraqnesinu jjrofundo longitudinali 

 intenupta; cavo pedieuli siilitubulato. Oeuli sat breves, retraetiles, non sese 

 latentes. Dens praeorbitalis validus ; spina postorbitalis acuta, fere longitu- 

 dinalis, sub qua spina parva juxta basim externam articuli primi antennae 

 extern* sita. Pars mobilis antennarum externarum rostro vix celata, flagel- 



