BY X. A. COBB, 405 



It is manifestly closely related to H. robustus. The tail is 

 short and tapers suddenly from near the anus, soon becoming- 

 setaceous to the naked terminus which is not expanded, 

 but has a peculiar cylindrical outlet for the secretion of the 

 caudal glands. The cuticle is finely transversely striated with 

 rows of fine dots, resolvable with moderate powers. Near 

 the lateral lines the dots are larger, and are arranged also in 

 longitudinal rows. On either side of the lateral line, separated by 

 a distance equal to one-eighth of the width of the body, two such 

 longitudinal rows are found, and clustered together between them 

 three other more irregular rows. This longitudinal arrangement 

 of the lateral dots ceases near the head and near the tail. The 

 cylindroid neck terminates anteriorly in a squarely truncate head 

 which bears on its margin ten papilla-like setfe, the only hairs to 

 be seen on the whole body. Each of the six conoid transparent 

 lips bears a papilla. The spiral lateral organs, consisting of three 

 winds, are one-fourth as wide as the head and are situated 

 opposite the middle of the pharynx; the right is a left-handed 

 spiral and the left a right-handed spiral. There are no eyes. 

 The pharynx is two-parted : the anterior cyathiform twelve-ribbed 

 part is one-half as wide as the head and nearly as deep as wide; 

 the posterior triquetrous part is as long as the anterior part, but 

 only about one-half as wide, each of its angles being the location 

 of a conspicuous longitudinal chitinous structure whose function 

 is to furnish attachment for one end of the powerful pharyngeal 

 muscles. The interior surface of the pharynx is supplied at its 

 narrowest part, namely, between the two chambers of which it is 

 composed, with numerous chitinous teeth whose function is, as 

 Dr. de Man has suggested, doubtless masticatory. I noticed also 

 a decided transverse striation, or rather file-like roughness, 

 between the longitudinal ribs of the anterior part of the pharynx, 

 designed, doubtless, to give a better grip on the food. It is 

 noticeable that these ribs of the anterior chamber are the summits 

 of ridges and are not conspicuous!}^ jointed as in Cyatholahmis 

 and many species of Chrornadora. The cylindroid oesophagus is 

 slightly expanded both anteriorly and posteriorly, and measures 



