THE VAUXTHOHPSONIIDJE 303 



The minute Cuma pulchella, Sars, has recently been taken 

 by Mr. Thomas Scott in the Firth of Forth. 



Cydaspis, ' with orbed carapace,' contains seven species, 

 one of which cormyera, Sars, by the pair of horns on the 

 sides at the anterior part of the carapace is a very marked 

 form. Cydaspis levis, G. M. Thomson, and Cydaspis pusilla, 

 Sars, are notable for having the carapace entirely devoid of 

 spines and sculpturing. 



Iphinoe trispinosa (Goodsir) is plentiful in some British 

 waters. The number of spines or teeth on the central 

 crest of the cai'apace is far from being always limited to 

 three. In the males these teeth are always set away from 

 the front of the carapace, and sometimes in that sex there 

 are none, though it is doubtful whether this is so frequently 

 the case that it can be called the rule. Iphinoe tenella, 

 Sars, has recently been taken in the Clyde. 



Cumopsis contains two species which are both British, 

 one, Cumopsis Edwardsii (Spence Bate), which was placed 

 successively in Cuma, Vaunthompsonia, and Bodotria, till 

 Sars established a new genus for it, and the other, Cumop- 

 sis longipes (Dohrn), the specific name of which has 

 priority over Icevis given by Sars. 



Family 2. Vaunthompsoniidce. 



General form, first antennas and mandibles, pleopods 

 and absence of telson, are as in the Cumidae. The flagel- 

 lum of the second antennae in the male is composed of 

 long slender joints. The epipod of the first maxillipeds 

 in the female is very narrow, with few, finger-like bran- 

 chial sacs arranged in a semicircle. The third maxillipeds 

 have the joints scarcely expanded. The first three pairs 

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

 have well-developed swimming-branches. The inner branch 

 of the uropods is two-jointed. 



There are at present three genera. 



Vaunthompsonia, Spence Bate, 1858, has the body not 

 very slender, scarcely compressed ; the eye distinct ; the 

 second joint of the third maxillipeds not produced; the 



