BY E. J. GODDARD. 469 



External characters. — The aiitei-ior half of the body is of a blue- 

 grey colour dorsally, the posterior half being a dirty yellow. 

 When removed from the substratum, the caeca of the crop were 

 plainly visible, and had a greenish colour, the last pair in one 

 individual being reddish-brown. When fully extended, the body 

 was greatly attenuated towards the anterior end, the posterior 

 half being the widest body-portion and this in uniformity. 

 Length in state of extension 33; length in state of contraction 

 14; greatest breadth 4*6 mm. The ventral surface is deeply 

 concave in killed specimens, the lateral margins of the body 

 projecting downwards for a considerable distance. 



No ornamentation, in the way of pigmented areas or prominent 

 sensory papillae, was noted in the living individuals, but in the 

 killed specimens sensory papillae are plainly visible. These can 

 be traced from the posterior extremity forwards, as far as the 

 22nd annulus, in the form of minute white tubercles, by no means 

 prominent, as regards size, but standing out slightly against the 

 surrounding body-surface, under detailed examination, as flattened 

 structures of a purer white colour. The colour mentioned is no 

 doubt due to the bleaching action of the corrosive sublimate, and, 

 in all probability, the colouration of the papillae themselves differs 

 in no wise from that of the ordinary body-surface. They can be 

 traced forwards as far as the 51st annulus from the posterior 

 extremity, and serve in this way as the only external sign of the 

 somitic constitution. Except at the posterior extremity, where 

 abbreviation has taken place and the triannulate somite lost, they 

 occur on every third annulus, each papuliferous annulus bearing 

 four papillae, two occurring on each side of the median line as 

 shown in fig. 9. The papilla on either side of the median line is 

 much more prominent than that nearer the margin. The surface 

 in general may be described as smooth. Total number of annuli 

 about 70. 



The disposition of the annuli, with reference to the somites, has 

 been made out chiefly from a study of the sensory papilhe, of the 

 position of the eyes, and the arrangement of the nerve-ganglia. 



