334 ASELLID^E. 



of the cephalon considerably within the margin. The 

 anterior pair we take to be those that are figured pos- 

 teriorly in our cut, the basal parts of which are seen 

 through the transparent tissue. These have the joints 

 of the peduncle, which we believe to be of the normal 

 number, surmounted by a slender flagellum consisting of 

 four articuli. The posterior pair of antennae are much 

 longer, having the joints of the peduncle very long, and 

 terminate in a slender flagellum, consisting of one long 

 and four short articuli. 



The anterior pair of legs (first pair of gnathopoda) are 

 moderately robust, and terminate in a hand of con- 

 siderable prehensile power. All the other legs are 

 slender and tolerably free from hairs. The pleon is pear- 

 shaped, broader anteriorly : on each side, somewhere 

 about two-thirds from the anterior margin, the posterior 

 pair of pleopoda are implanted in the margin, these are 

 fringed with two or three very fine cilia ; between this 

 and the anterior margin the edge of the pleon is fringed 

 with a delicate, serrated margin : so transparent is the 

 structure, that it escaped our observation, when we drew 

 the figure, that nine minute teeth were present. On 

 each side of the pereion the hairs are connected 

 together by an exquisitely fine fibrous membrane, that 

 nearly reaches to their extremities. 



The animal lives in the mud ; two or three specimens 

 have been taken by Mr. Robertson at Cumbrae, to whom 

 we are indebted for it. 



