218 PEOFESSOE F. M. BALFOUE. 



The Buccal Cavity, Jaws, and Lips are described below. 



The Ambulatory Appendages. — The claw-bearing legs are 

 usually seventeen in number; but in two cases of small females 

 we have observed that the anal papillae bear claws, and pre- 

 sent all the essential features of the ambulatory appendages. 

 In one small female specimen there were twenty pairs of claw- 

 bearing appendages, the last being like the claw-bearing 

 anal papillae last mentioned, and the generative opening being 

 placed between them. 



The ambulatory appendages, with the exception of the fourth 

 and fifth pairs in both sexes, and the last pair (seventeenth) in the 

 male, all resemble each other fairly closely. A typical appen- 

 dage (figs. 2 and 3) will first be described, and the small 

 variations found in the appendages just mentioned will then 

 be pointed out. Each consists of two main divisions, a larger 

 proximal portion, the leg, and a narrow distal claw-bearing 

 portion, the foot. 



The leg has the form of a truncated cone, the broad end of 

 which is attached to the ventro-lateral body-wall, of which it 

 appears to be, and is, a prolongation. It is marked by a number 

 of rings of primary papillae, placed transversely to the long 

 axis of the leg, the dorsal of which contain a green and 

 the ventral a brown pigment. These rings of papillae, at 

 the attachment of the leg, gradually change their direction 

 and merge into the body rings. At the narrow end of the cone 

 there are three ventrally placed pads, in which the brown pig- 

 ment is dark, and which are covered by a number of spines 

 precisely resembling the spines of the primary papillaj. These 

 spinous pads are continued dorsally, each into a ring of 

 papillee. 



The papilla} of the ventral row next the proximal of these 

 spinous pads are intermediate in character between the primary 

 papilla) and the spinous pads. Each of these papilla? is larger 

 than a normal papilla, and bears several spines (fig, 2). This 

 character of the papilla of this row is even more marked in 

 some of the anterior legs than in the one figured ; it seems 

 probable that the pads have been formed by the coalescence of 



