236 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



in July; and Colwyn Bay in September, very few 

 individuals were taken in the bottom tow-net. It is 

 possible that this may partly account for the small takes 

 of fish at Ehos Weir this summer. 



" The following are the more noteworthy Crustacea 

 taken during the past season. : — 



" My sis longicornis, M. Edw. [G. 0. Sars, Middelhavets 

 Mysider, p. 22 (separate copy) pis. ix and x.] 



" This species, hitherto recorded only from the Bay of 

 Naples, may be at once distinguished from all the other 

 British species of the old genus Mys is, except M. {Neomysis) 

 vulgaris, J. V. Thompson, by the absence of a notch, or 

 cleft, at the end of the telson, and from that species by 

 its telson having the end rounded, and the margins 

 furnished with closely set setae of unequal length. On the 

 other hand, the resemblance of the telson and antennal 

 scales to the genus Leptomysis is remarkable. The female 

 of this species is practically indistinguishable from the 

 same sex in Leptomysis apiops, G. 0. Sars, except by the 

 length of the spine on each side of the two small central 

 spines at the apex of the telson. These in M. longicornis 

 are but little longer than the other long spines on the 

 margin, while in L. apiops they are quite twice as long. 

 The resemblance extends to the curious trigonate points 

 of the spines round the end of the telson, which I have 

 not observed in any Crustacean except these two. A new 

 genus is required for this species, the characters of which 

 do not agree with any of the existing genera of Mysidae. 



" One female was taken in the bottom tow-net at Bull 

 Bay, June 10th, 1898, in 20 fath. Length 6 mm. 



" Cumella pygmcea, G. O. Sars. Several females and 

 three males taken at the same time and place as the last. 

 Not previously recorded in Liverpool Bay. 



" Argissa hamatipes (Norman) ; = Syrrho'e hamatipes, 



