314 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



of its length rather more than half the prostomial diameter. The 

 terminal half narrows gradually to a moderately sharp point. Prom- 

 inent dark-brown spots occur on the tentacles, tentacular cirri, and 

 palps. 



The protruded pharynx is 8 mm. long. Above and below on its 

 terminal margin on either side of the mid line there is a row of six. 

 papillae. Dorsally the mid line is marked with a more prominent 

 papilla. A smaller one lies in a corresponding position on the mid- 

 ventral line. Brown spots similar to those on the head appendages 

 occur on the papillae. In each of the upper and lower jaws are two 

 sharp-pointed, strong, light-brown teeth. 



Dorsally and ventrally the central longitudinal areas of the body 

 are sharply differentiated from the lateral by two longitudinal 

 muscle bands, which are more widely separated from each other 



Figure 1. — Macellicephala maculosa, new species : a, Head, 

 X 1V-2 ; o, fifteenth parapodium, X 17%; c, d, e, various 

 types of dorsal setae, X 250 ; /, neuropodial seta, X 250 ; 

 g, anterior stout seta, X 250 



ventrally than dorsally. The first pair of elytra are large enough to> 

 overlap dorsally and completely cover the head. Actually, in this 

 preserved specimen, they are thrown forward so as to leave the head 

 uncovered, and their anterior margins extend to the middle of the 

 length of the palp. The second pair are smaller, and this decrease in. 

 size continues in later somites, so that in the region of the twenty- 

 fifth they barely reach to the margin of the dorsal muscle band. 

 They are all very thin and transparent, especially the posterior ones, 

 which are quite invisible until lifted on the point of a needle. 

 They are oval in outline, with smooth margins and no noticeable 

 surface markings. 



The anterior somites are closely crowded together, and the para- 

 podia are nearly as long as the somites. This is doubtless due to 

 contraction in preservation. Later somites are longer and the para- 

 podia more prominent. A conspicuous feature of later somites is the 

 presence of a large chitinous coiled rod, like that described in a 



