12 C. BOVALLIUS. ASELLIDA. 
The head is broader than long, the margins entire. Eyes 
wanting. The fagellum of the first pair of antenn&e consists 
of 6—38 articles, with 6 olfactory tubes in the male, and 3 in 
the female. The second pair of antenn&e are as long as the 
body. The metacarpus of the first pair of pereiopoda dilated, 
ovate. The first pair of pleopoda consist of a peduncle 
and an elongate ovate lamina, in the male; in the female of 
an elongate lamina, with the outer margin convex, the inner 
straight. The outer ramus of the uropoda is half as long as 
the inner, 
Colour. White, without spots. 
Length. 8—10 mm. 
Hab. Recorded from caves and wells in Germany and 
France, and also from Helgoland. 
4. Asellus communis. TH. SAY. 
Syn. 1818. Asellus communis. SAY. »An account of the 
Crustacea of the Uni- 
ted States» Journal 
of the Academy of 
Sciences of Phila- 
delphia. Vol. 1, part. 
2, p. 427, 
1840. 2 3 2 H. MILNE-EDWARDS. Histo- 
ire naturelle des 
Crustacés. Tome 
3:me,.p. 1475 Parid 
184. 2 vulgaris. LATREILLE. GouLD. Report on the In- 
vertebrata of Massa- 
chusetts. Pp. "337. 
Boston. 
184. > communis. SAY. DE KaY. Zoology of New- 
York or the New- 
York Fauna, Part 
6, Crustacea. p. 49. 
Albany. 4:to. 
174, 3 3 3 S. I. SmITH (and HARGER). 
»The Crustacea of the 
fresh waters of the 
United States» Re- 
portof the U.S. Com- 
missioner of Fish and 
Fisheries. Part 2, p. 
6ö7, pl 1; DEE 
