460 Mr. C. Spencc Bate on the British Diastylidse. 



terminal shorter ones. None of these are furnished with a palpe, 

 or secondary appendage. They are moderately covered with 

 cilia, most of which are of a peculiar form, very long and slight 

 (15 a), with a smaller, short stout hair at the base. The longer 

 one is very straight, and through two-thirds of its length pos- 

 sesses what appears to be an internal spiral. 



The penultimate segment of the abdomen is furnished on each 

 side with a member consisting of a long basal joint and a pair of 

 terminal styliform appendages, each of which is double-jointed ; 

 the outer one being fringed on the inner side only with plu- 

 mose cilia, the inner one with corresponding serrated spinules. 

 The termination of the alimentary canal is seen to debouche in the 

 rudimentary telson (or terminal joint of the animal). 



We have received this species through the kindness of the 

 Rev. Geo. Gordon, who took it in the Moray Frith. Mr. Goodsir 

 took a single species in the Frith of Forth. 



Genus Bodotria, Goodsir, Edin. New Phil. Journ. 1843. 



Bodotria arenosa, Goodsir *. PI. XV. fig. vi. 



First, second, third, fourth and fifth segments of the abdomen 

 each armed with a pair of bifurcate finlets. The two terminal 

 scales of the caudal styles are single-jointed. The superior 

 antennae are quite obsolete ; the inferior pair are of considerable 

 length, and are terminated by means of two long spines. 



Genus A^exilia, u. g. 



Carapace with the lateral angles meeting in front of the 

 antennal segments. Both pairs of antennae well developed. 

 Five of the posterior segments of the thorax exposed. Each of 

 the five anterior abdominal segments carries a pair of swimming 

 feet ; the penultimate is furnished with a pair of appendages of 

 the form common to the family. Telson rudimentary. 



Venilia gracilis, mihi. PI. XV. fig. vii. 



Carapace long and narrow, the lateral angles meeting in front 

 of the antennal segments, and projecting anteriorly into a 

 rostrum-like point. The superior antenna well developed, and 

 reaching much beyond the anterior margin of the carapace. 

 The inferior antenna consisting of a peduncle formed of three 

 (or more) articulations, the last of which is longest, and an 

 extremely long and delicate terminal filamentary appendage, 



* For this description, together with the figure, I am indebted to 

 Mr. Goodsir's paper, to which I must refer the reader for a more complete 

 account. 



