Phyllopod Crustacea. -337 



As tlius restricted, the genus is characterized by the stout 

 two-jointed claspers of the male, with or without a tooth near 

 the base of the hook, the basal joint being swollen, by having 

 a pair of simple appendages resembling antennae between the 

 bases of tlie claspers in front, by the large, thick, oval egg- 

 pouches of the female, and, apparently, by the structure of the 

 branchial organs. It includes B. stagnalis^ B. spinosus, Edw., 



B. vernah's, Verrill, sp. nov., &c. Perhaps B. paludosus, 

 Miiller, also belongs here. 



^,MTSf'2kQMj}^(<LQ'- — -A. group of species allied to these, but de- 

 stitute of all appendages between the bases of the claspers of 

 the male, which are more slender and simple — with a much 

 elongated egg-pouch, having lateral lobes at the base — a more 

 slender body, with more elongated brancliial organs, the middle 

 ones longest — and having, in general appearance, a much 

 stronger resemblance to Artemta, probably constitutes an- 

 other genus ; but for the present we prefer to regard it as a 

 subgenus of BrancMjous. 



For this group we propose the name BrancMnecta. It in- 

 cludes two new arctic species, B. grcenlandica and B. arctica^ 

 and B.ferox (Edw., sp.) from near Odessa. 



Heterohranchipus. — Dr. Lov^n* has described a singular 

 species, B.cafer-j which appears worthy to constitute a distinct 

 genus. It is remarkable on account of the very curious claspers 

 of the male, which are very long, three-jointed, flexuous, the 

 basal joint bearing a long cirrus externally and a lacerate tooth 

 on the inner side of the base, the outer joint bifid, the internal 

 part cirriform, the external one deeply bilobed. External 

 male organs very long, slender, curved, outer portion serrate 

 on the outer edge, with short setse on the inner edge ; egg- 

 pouches long, slender, slightly enlarged and beaked at the 

 end ; branchiae of a peculiar structure ; front of head between 

 the claspers with a short bimucronate rostrum. 



H. cafer is from the marshes of Natal, South Africa. 



ChirocejjhaluSj Prevost, 1803. — This genus, established for 



C. diajjJianus^ is evidently very distinct from all the preceding. 

 The typical species is large, stout, and remarkable for the 

 singular appendages between the claspers of the male, on the 

 front of the head. These consist of two long, ligulate, fleshy 

 processes, serrated on each side, which coil in a spiral beneath 

 the head, but when extended, as in copulation, reach beyond 

 the claspers ; attached to the outer side of each of these 

 are four long processes strongly serrate on the inner edge, aud 

 near the base another large, broad, thin, subtriangular appen- 



* Kongl. Vet. Akad. Hancll. 1846, p. 433, tab. 5. 



