MARINE ISOPODA OF NEW ENGLAND, ETC. 



307. 



The color of these animals is dull and somewhat variable, usually- 

 brownish or fuscous, with lighter margins and two broad dorsal vittae. 

 Length S""^, breadth 4:"''^. 



This species has been found under rubbish and stones from Great Egg 

 Harbor, ! N. J., to Barnstable, ! Mass. All the specimens that I have seen 

 have been from the coast, although Say states that it is " very common 

 under stones, wood, &c., in moist situations." 



Specimens examined. 



Scyphacella Smith. 

 Scypliacella, Smith, This Eeport, part i, p. 567 (273), 1874. 



Antenna composed of eight distinct segments, with a geniculation at 

 the articulation of the fourth with the fifth segment ; terminal portion, 

 or flagellum, composed of three closely articulated segments besides a 

 minute apical one; mandibles slender; exposed portion of the maxilli- 

 peds formed of only two segments. 



The genus Scyphacella was founded by Professor S. I. Smith, in part 

 I of this Report, for the reception of the following species, the only one 

 yet known. In regard to the relations of the present genus with Scypliax 

 Dana* Professor Smith says : " This genus differs from Scyphax most 

 notably in the form of the maxillipeds, which in Scyphax have the ter- 

 minal segment broad and serrately lobed, while in our genus it is elon- 

 gated, tapering, and has entire margins. In Scyphax, also, the posterior 

 pair of thoracic legs are much smaller than the others, and weak ; the 

 last segment of the abdomen is truncated at the apex, and the articula- 

 tions between the segments of the terminal portion of the antennse, are 

 much more comj)lete than in our species. The general form and appear- 

 ance of the genera are the same, and the known species agree remark- 

 ably in habits, the Scyphax, according to Dana, occurring on the beach 

 of Parua Harbor, New Zealand, and found in the sand by turning it 

 over for the depth of a few inches." 



Scyphacella arenicola Smith. 



Scyphacella arenicola Smith, This Eeport, part i, p. 5C8 (274), 1874. 

 VcrriU, This Eeport, part i, p. 337 (43), 1874. 

 Harger, Proc. U. S. Nat. Mus., 1879, vol. ii, p. 157, 1879. 

 Plate I, Fig. 2. 

 The small size, nearly white color, and peculiarly roughened surface 

 of this Isopod will in general serve for its recognition, and the presence 

 * U. S. Exploring Expedition, Crustacea, p. 733, pi. 48, fig. 5. 



