CAMPYLASPID^— PSEUDOCUMID.E 807 



inner branch, of the uropods is one-jointed. The telson is 

 wanting. 



The single genus, Campylaspis, Sars, 1865, is well 

 marked by the enormous development of the carapace, 

 which usually bulges backward over some of the free 

 segments of the trunk. Sars has found in this genus the 

 liver consisting of only a single pair of caecal tubes instead 

 of three pairs. Thirteen species have been described, 

 eleven of them by Sars himself, the other two being 

 rubicunda (Lilljeborg) and carinata^ Hansen. GamiJi/laspis 

 costata, Sars, has been recorded from the Clyde by Mr. 

 Thomas Scott, F.L.S. 



Family 6 . — Pse udocumidce. 



The first antennae have one of the flagella rudimentary. 

 The flagellum of the second antennas is composed of rather 

 long slender joints. The anterior branch of the mandibles 

 has few spines. The epipod of the first maxillipeds has 

 only slight traces of branchial sacs. The first two pairs 

 of perseopods in the female and the first four in the male 

 have well-developed swimming- branches. The male has 

 but a single pair of well-developed pleopods. The inner 

 branch of the uropods is one-jointed. The telson is dis- 

 tinct, but very small, and unarmed. 



The family contains two genera. 



Pseudocuma, Sars, 1865, has an eye; there are two- 

 jointed rudimentary exopods on the third and fourth pairs 

 of per^opods in the female, and in the male rudimentary 

 pleopods on the second segment of the pleon, and plumose 

 setse in place of pleopods on the third, fourth, and fifth 

 segments. Pseudocuma longicornis (Spence Bate) is an 

 abundant British species, often spoken of as Pseudocuma 

 cercaria (van Beneden), but Bate's name is the older. In 

 speaking of the species as British, it will be understood 

 that there is no intention to exclude any number of other 

 localities. Pseudocuma ciliata, Sars, is the only other 

 species in the genus, and this it would be better to call 

 ciliatus, since, if the gender of the generic name is 

 attended to, it would rather become ciliatum than ciliata. 



