I. '08. 157 



of the somite to form a pair of sharp spines on either side of 

 the telson. The sixth somite is about one and a half times the 

 length of the fifth. The lateral portions of all the somites are 

 occupied by obscure elevations and depressions ; in the male 

 the 2)lcui-a ai'c bluntly pointed below, but more rounded in the 

 female. 



The telson is not quite one and a half times the length of the 

 sixth somite, but is somewhat longer than the inner uropod, 

 slightly sulcate dorsally, and terminates in an acute point, 

 which, in perfect specimens, is provided with a few long setae ; 

 dorso-laterally it is furnished with one or two very minute 

 pairs of spinules. 



The eyes are short and widest distally ; the cornea, which 

 is black, occupies only a comparatively small area at the apex 

 of the stalk. 



The peduncle of the inner a)ite}niae reaches more"* than half 

 the length of the antennal scale ; the lateral process is apically 

 pointed and scarcely reaches to the distal end of the basal seg- 

 ment, the second joint is rather longer than the third. In the 

 female the two flagella are of about equal thickness, the inner, 

 which is longer than the outer, being somewhat shorter than 

 the peduncle. In the male (fig. 3) the inner flagellum is 

 quite twice the length of the peduncle, while the outer is 

 shorter and greatly thickened basally. 



The aniennal scale (fig. 4) is almost twice as long as wide ; 

 its outer edge is very definitely concave and the apical spine 

 projects beyond the lamellar portion. 



The oral appendages do not appear to differ in any im- 

 portant particular from those of A. cataphractus, but are pro- 

 vided with finer and less dense fringes of setae. In both 

 species the podobranch at the base of the second maxillipede 

 is practically rudimentary, consisting only of a few simple 

 plates. 



The pereiopods also bear the closest resemblance to those of 

 A. cataphractus ; as a whole they are rather more slender and 

 a trifle longer than in that species and the setae are finer and 

 less numerous. The small exopod at the base of the first pair 

 of pereiopods is rather densely clothed with fine setae. In 

 the second paii' the propodus, carpus, and merus are all nearly 

 the same length and each shorter than the ischium. The 

 third pair is longer and more slender than the fourth and fifth 

 which are of about equal length. 



The first five abdominal sterna are each furnished with a 

 small median tubercle which is far less conspicuous than the 

 stout spine present in cataphractus. 



The inner uropod is narrow, about six times as long as 

 bioad, and is much longer than the outer, which is little more 

 than three and a half times as long as broad. 



Size. — The largest specimen is a female measuring 32 mm. 



Through the good offices of M. Penot I have been able to 

 compare the Irish specimens, w^hich were recently described 

 as A. Brendani, with authentic examples of A. Lacazei from 



