ISOPODS OF THE ATLANTIC COAST— RICHARDSON. 



563 



Hahitat. — Greenland; North America at Woods Hole, Massa- 

 chusetts, and Providence, Rhode Island; also Sweden'; Denmark; 

 Germany; Holland; Great Britain; France; Spain; Itah" Azores; 

 Iceland; and coast of Norway. 



140. ONISCUS AFFINIS Say. 



Ormcus affinu Say, Jour. Ac. Nat. Sci. Phila., I, 1818, )>. 430-4;U. 

 Oiise?/^ r'jcariits Stuxberg, Ofvers. Svenska Vet. Acad. Forh., 1872, Pt. 9, p. 8, and 

 1875, Pt. 2, p. 50. 



Habitat. — North America. 



61. SYNUROPUS, new genus. 



Body oyal, not contractile into a ball, with the segments laterally 

 expanded, as in Oniscus. 



Head with lateral and frontal lobes. Antennjij with iiagellum con- 

 taining three joints. 



Abdomen not narrower than thorax; abdominal epimera large. 



Terminal segment of body much broader than long, widel}' rounded 

 posteriorly, not conically produced as in Onis- 

 CK-s. Basal joint of the uropoda large, broadly 

 expanded inside, not oblong as in On/.sr>/-'<: 

 inner branches close together, their internal 

 lateral margins contiguous. Outer branch 

 somewhat longer than inner branch. 



141. SYNUROPUS GRANULATUS, new species. 



Body oyal, not able tu be contracted into a 

 ball, with the lateral parts of the segments 

 expanded. 



Entire surface of body covered with small 

 tubercles. 



Head deeply set in first thoracic segment, 

 whose rounded anterior angula- 

 tions reach the antero-lateral 

 angles of the head. The anterior 

 margin of the head is produced in J^'^- 3o.-synuropus gram- 



, , T • i 1 T IT LATUS. a, DORSAI, VIKW; b, 



an obtusely pointed median lobe. uropoda. 



The lateral lobes are very acute. 



The antennte are geniculate at the articulation of the 



fourth and fifth peduncular joints; the flagellum contains 



three joints. 



The first thoracic segment is longest; the others sub- 

 equal. The abdomen is not narrower than the thorax. 

 The first two segments have their lateral margins concealed. The 

 foUow^ing three have their lateral margins broadly expanded. The t(n-- 

 minal segment is twice as broad as long, with the posterior margin 



Fic;. 31.— Max 



ILLIPED. 



