of the Fishery Board for Scotland, 



161 



The distinguishing characters of S. Clausii are the single seta on inner 

 margin of last joint of peduncle of antennules, the slender legs and claws, 

 and three equal-sized spinules between the ultimate spines of the telson. 



Siriella norvegica^ G. 0. Sars. 



Sinella norvegica G. O. Sars, Untersog. over Christianiafjordens Dyh- 

 vandsfauna, 1869, p. 30 ; Monog. over de ved Norges kysters forekom- 

 mende Mysider, 1879, p. 24, pis. xvii. and xviii. 



Very like the last in general characters, and in rostrum, antennal scale, 

 pereiopods, &c., but it attains a larger size, 19 mm. as against 10 mm. 

 The following are points of distinction : — Last joint of peduncle of anten- 

 nules with three setae on inner margin ; antennal scales perhaps rather 

 longer, reaching end of peduncle of antennules ; and rather wider in 

 the middle than towards extremity. General character of telson as in last 

 species, but the extremity having a central small spinule, flanked on each 

 side by a still more minute spinule and pair of setae between the ultimate 

 spines. Outer uropods with 17 to 25 spines on outer margin of first joint. 

 Inner uropods with smaller spines alternating with larger throughout the 

 inner margin, except between the last and penultimate spine. 



Norway, Christiania Fjord and West Coast (G. 0. Sars) ; Lervig, Har- 

 danger Fjord (A. M. K). 



Siriella norvegica has not as yet been found on our coast, but may be 

 expected to occur. Its characters are given here, as well as those of the 

 next species, for comparison with, their very close allies. 



Siriella crassipes^ G. O. Sars. 



? Cynthia Flemingii H. Goodsir, Bell British Stalk-Eyed Crustacea. 

 1853, p. 379 {mas.). 



Siriella crassipes G. O. Sars, Middlehavets Mysider^ 1876, p. 89, pi. 

 xxxii. 



In general characters very near the two preceding species, but the whole 

 form is somewhat more robust in proportion to size, and the legs are much 

 stronger. The following will supply diagnostic characters. 



Antennules with three setae on inner margin of third joint of peduncle. 

 Antennal scale less parallel sided than in Clausii, widening slightly about 

 the middle, as in norvegica. Pereiopods stout and strongly built, the 

 joints more flattened and wider in proportion to their length than in the 

 two preceding species ; finger with first joint not longer in lesser (front 

 length) than broad, second joint or nail strong and well curved. Telson 

 terminating in a small spinule flanked on each side by the usual setae, 

 and a more minute spinule between the ultimate pair of spines ; 3 to 4 basal 

 spines of lateral margin, as usual, separated by an interval from following 

 spines ; on hinder portion 2 to 6 smaller spines (varying in number accord- 

 ing to size of specimen) in the intervals between the larger spines. Uro- 

 pods narrow ; outer with 9 to 12 spines on external margin of basal joints, 

 terminal joint twice as long as broad. Inner uropods with smaller spines 

 alternating with the larger on the upper half of inner margin, but eight or 

 more distal spines without such smaller spines between them. 



This species has been known to me as a member of our fauna for the 

 last twenty-five years, at which time I found it at Cullercoats, Northum- 

 berland. Specimens are also in my collection from Banff (T. Edward) ; 

 Starcross, Devon (C. Parker, 1883); Jersey (Sinel & Co., 1884). 



It is recorded in The Life of a Scotch Naturalist under the name 



L 



