162 



Appendices to Fourth Annual Report 



Mysis aculeata, a MS. name by which I had called the female when first 

 found. 



Cynthia Flemingii, Goodsir, is a male of this genus, and most probably 

 of this species, but it is impossible to identify it with any degree of 

 certainty from the description given. 



In the Mediterranean this species was found by Sars in company with 

 S. Clausii at Goletta. 



Siriella Brooki, Norman, n. sp. 



Very like the three species which have just been described- The 

 rostrum is shorter, and bent downwards at the extremity. The anten- 

 nules have one seta on inner margin of last joint of peduncle. The 

 pereiopods are intermediate in thickness between those of Clatisii 

 and crassipes, the finger strong, the first joint not longer in its lesser 

 (front) length than its breadth, second joint or nail strong and well 

 curved. Telson terminating in a small spinule, flanked on each side by 

 the usual setae and a very minute spinule between the ultimate spines. 

 Uropods narrow, outer pair with ten to twelve spines on exterior margin 

 of first joint, terminal joint twice as long as broad. Inner uropod with 

 seven or more distal spines of interior margin without smaller intermediate 

 spines, and even above these they only become decidedly smaller by 

 degrees. Colour of specimens which had been a few days in spirit, white, 

 the eyestalks and peduncles of antenna suffused with yellow, telson and 

 uropods more or less stained with yellow or pink. Length from the end 

 of antennal scale to extremity of uropod rather more than half an inch, or 

 14 mm. About a dozen specimens, including both sexes, examined. 



Very near to crassipes, from which it differs in being more slender in 

 general form, with less strong pereiopods, and a single seta only on inner 

 margin of ultimate joint of peduncle of antennules. 



Possibly it may prove to be a variety of crassipes, but more extended 

 observation is necessary to clear up this point. 



With regard to the number of setae on inner side of last joint of 

 peduncle of the antennules, I may mention that in some specimens of S. 

 crassipes I have not been able to make out more than two, and in one 

 specimen of S. Brooki the left antennule has a second seta, while the 

 right bears as usual one. 



S. Brooki has been found at Tarbert, Loch Fyne, by the Fishery 

 Board, in company sometimes with 8. Clausii, I have named the species 

 after Mr G. Brook. 



Siriella armata (M.-Edw.). 



Cynthia armata, M.-Edw., Hist. Nat d. Crust, ii. p. 463 (mas fide 

 G. O. Sars). 



Mysis Griffithsice, Bell, Hist Brit. Crust, p. 342. 



Mysis rostratus, Gu6rin, Iconog. Crust., pL xxiii. fig. 3 (probably). 



Siriella armata, G. O. Sars, Middelhavets Mysider^ 1876, p. 96, pi. 



XXXV. 



Animal very long and slender. Rostrum of great size, the extremity 

 very acute and reaching the end of the second joint of the peduncle of 

 the antennules. Antennal scale long and narrow, not quite as long as 

 peduncle of antennules. Pereiopods slender. Telson terminating usually 

 in four equal sized spinules and two seta between the ultimate spines. 

 Wide intervals between the larger spines of lateral margin, these intervals 

 occupied by six to ten smaller crowded spines of nearly equal size. 



