84 MESSES. NOEMAX AXD STEBBJNG ON THE 



its peculiar structure and position seem to indicate that it may be a delicate organ of 



touch. 



Last legs (i. frp'') having the hinder margin of all the upper joints set with long 

 plumose seta; ; meros bearing a long spine at the lower corner of the front margin ; 

 carpus with three spines on the front, and an oblique row of four spines on its flattened 

 side ; hand with a small simple spine at the base and a longer spine on each side of the 

 insertion of the dactylos, also a row of 4-5 spiues on the side ; these spines, when 

 carefully examined, are found to have their terminal portion channelled, and the edges 

 of the channel denticulately serrated, but the extreme end of the spine is without this 

 serration and is gently curved ; but the most remarkable part of this remarkable hand 

 is that the whole palm and distal margin, except when occupied by the spines already 

 described, is beautifully pectinated with a row (about 30) of closely placed lancet-shaped 

 spinelets, which, under a high power, are found to be exquisitely serrulated on both 

 margins ; finger long and slender, subequal in length to the hand, unguiculate, with a 

 minute cilium at the origin of the unguis and a cilium on the middle of the upper 

 margin. 



Uropods (i. PI. V.) haA-ing the outer branch 4-jointed, first very short, second and 

 third subequal, and each more than double the length of the first, fourth nearly as 

 long as the second and third combined ; inner branch very long, of about 32-36 

 articulations. 



The female differs from the male in having the first pair of legs of much less robust 

 character, especially as regards the hand, which is feebler and narrower (i. git" ? ) ; the 

 thumb without the tooth and with the serrated-edge lancet-processes excessively trans- 

 parent ; there is also a bunch of long cilia witliout, and a line of short cilia within 

 the thumb. 



Length 7 millim., or -^q of an inch. 



Ajiseudes latreUlii has not been taken in any of the Atlantic dredging expeditions ; 

 but it has seemed to us desirable, indeed necessary, that this species and A. talpa 

 should be carefully described in order that they may be distinguished from each other 

 and from the species first recorded in this paper, as well as from the many more allies 

 which it is probable will before long be brought to light. 



Our description is chiefly drawn up from specimens dredged by A. M. Norman in 

 Guernsey, in Brelade Bay, Aug. 10, 1865. Some of these were placed in Bate and 

 Westwood's hands, when they were preparing their work, and they are erroneously 

 referred to by them as belonging to A. talpa. The specimen of this species which 

 constituted the type described and figured by Bate and Westwood as A. latreUlii is also 

 in our collection. It is a female, and was taken on the Northumberland coast. 

 Professor G. O. Sars has taken it at Goletta and Naples. 



