28o CRUSTACEA OF NORTHUMBERLAND AND DURHAM 



shorter flagellum small, equal in length to first joint of the 

 longer flagellum. 



The first feet have their basal joint spinose all over, and the 

 basal joint of the palp is also spinose ; the penultimate and 

 antipenultimate joints are subequal, and the last joint nearly 

 as long as the preceding. The basal joint of all the following 

 feet is also spinose, but not so strongly as that of the first pair. 



The telson has about 14-19 spines on each side. Uropods 

 with 20-25 spines on the peduncle; inner branch with first 

 joint bearing 9-1 1 spines on the inner margin; the second 3-4, 

 the third 3-6 and terminal spines. Length, 11-12 mills. 



The adult male has the raised line which in that sex 

 commonly occupies a longitudinal position on the side of the 

 carapace only slightly developed, and it is not until a high 

 power of the microscope is used that it is seen to bear very 

 minute spines. The legs are very spiny. The upper and 

 lower lateral margins of the segments of the tail are strongly 

 spined. The telson has only about nine slender spines on 

 each side ; it equals in length the peduncle of the uropods. 



This species was first dredged by the "Porcupine" in 1869 

 in 15 fathoms in Lough Swilley, Co. Donegal. Mr. A. O. 

 Walker has taken it in the Irish Sea. A. M. N. has found it 

 to be not uncommon at Plymouth. 



On the Durham coast it was dredged in shallow water off 

 Seaton Carew (A. M. N.) D. 



DiASTYLIS CORNUTA (Boeck). 



1863. Cnma cornuta, Boeck, Christiania Vid.-Selsk. 

 Forhand., p. 190. 



1864. Diastylis bispinosa, G. O. Sars (nee Stimpson), Om 

 de aberrante Krebsdyrgruppe Cumacea, Vid.-Selsk. 

 Forhand., p. 39. 



1865. Diastylis bicornis, Bate, Ann. and Mag. Nat. Hist., 

 ser. 3, vol. XV., p. 84, pi. i., fig. 2. 



1869. Diastylis bispinosa, Norman, Last Report Shetland 

 Dredging, Brit. Assoc. Rep. for 1868, p. 270. 



1900. Diastylis cor/n/ta, G. O. Sars, Crust. Norway, 

 iii. Cumacea, p. 45, pis. xxxv. and xxxvi. 



