ISOPODS OF NORTH AMERICA. 671 



merit. The outer branch is broad, flattened, and round; the inner 

 branch is smaller and narrower, and posteriorly rounded. 



There are but six pairs of legs, those of the seventh thoracic seg- 

 ment being wanting. 



A few specimens were collected by Prof. A. E. Verrill and party at the 

 Bermudas in 1898, and at Castle Island in 19(>1, under stones, in dry 

 places. 



Type in the Peabody Museum, Yale University. Cat. No. 3224. 



Family XXV11. SCYPHACID^. 



Head without median or antero-lateral lobes. Front not margined, 

 but continuous with the epistome. Second pair of antennae with flagel- 

 lum composed of four articles. First maxillae with the inner lobe 

 furnished with two plumose setae; outer lobe furnished with teeth. 

 Second maxilla? furnished with hairs. Mandibles without molar 

 process. Maxilliped with masticatory lobe acutely produced; palp 

 elongate, much longer than masticatory lobe, with articles large and 

 not distinctly defined. 



Abdomen not abruptly narrower than thorax. 



Uropoda extending beyond the tip of the abdomen; inner branch 

 inserted at the upper inner angle of the basal article. 



122. Genus SCYPHACELLA Smith. 



i 



Outer lobe of first niaxillse furnished along the distal half of the 

 inner margin with recurved spines. 



Inner lobe furnished with two widely separate plumose processes, 

 one at the tip and the other on the inner margin. 



Second maxilla? furnished with hairs at the tip. 



Both first and second maxilla? long and slender. 



Epignath of maxillipeds long and narrow, acutely produced at the tip. 



Eyes large, composed of many ocelli. 



Abdomen not narrower than thorax. 



Cropoda exposed, both branches styliform. 



SCYPHACELLA ARENICOLA Smith. 



Scyphacella arenicola SMITH, Report U. S. Commissioner of Fish and Fisheries, 

 1873, Pt. 1, p. 567 (274). HARGER with VERRILL, Report U. S. Commis- 

 sioner of Fish and Fisheries, 1873, Pt. 1, p. 337 (43). HARGER, Proc. U. S. 

 Nat. Mus., II, 1879, p. 157; Report U. S. Commissioner of Fish and Fish- 

 eries, 1880, Pt. 6, pp. 307-308, pi. i, fig. 2. 



Trichoniscus arenicola BUDDE-LUND, Crust. Isop. Terrestria, 1885, p. 249. 



Sci/phacella arenicola UNDERWOOD, Bull. 111. State Lab. Nat. Hist., II, 1886, p. 

 363. RICHARDSON, American Naturalist, XXXIV, 1900, p. 307; Proc. U. S. 

 Nat. Mus., XXIII, 1901, p. 576. 



