136 PROCEEDINGS OF THE ACADEMY OF [Feb., 



worm, retaining sonic of its larval features, with seta> and parapodia 

 undeveloped, and whose peritoneiun and ccelom have been transformed 

 into a generative organ. 



S. SuDiniarij. 



External Form. — The head of the female (text fig. I) is bluntly 

 conical in front and tapers rapidly behind to a well-defined neck. A 

 pair of red kidney-shaped eyes are borne on the dorsal surface of the 

 head. On its anterior surface are two long sense hairs, symmetrically 

 placed, and a number of smaller ones. A group of small sense hairs is 

 also present on its dorsal surface. The body is cigar-shaped, and 

 divided by constrictions into six segments, each of which bears a single 

 band of cilia. A circumanal band of cilia is also present, but is inter- 

 rupted on the dorsal surface. The head bears two rings of cilia, one 

 in front of the eyes, and one behind them, the latter band encircling 

 the head at its greatest diameter. Both of these bands are interrupted 

 by a dorsal gap. The anterior cephalic bands bend backward between 

 the ej^es. On each side of the head, behind the second cephalic ring, 

 is a shallow ciliated groove which runs ventrad to the lateral borders 

 of the mouth. A strip of cilia clothes the ventral surface of the animal 

 from the anterior tip of the head to the end of the caudal append age. 

 The males (text fig. II) are minute in size, short cylindrical in form, and 

 slightly constricted in the middle. A circular band of cilia is borne at 

 the anterior end, and a ciliated strip covers the ventral surface. A 

 conical penis is found near the posterior end of the body. 



Body Wall. — The body wall is composed of a one-layered hypo- 

 dermis, covered on the exterior by a thin cuticle. It is thin in the 

 intersegmental regions, thick in the intrasegmental. A ventral 

 thickened area extends the entire length of the animal. 



Gland Cells. — The body wall contains glands of three types. The 

 glands of the first type are mucous in character, scarce, and confined 

 to the ventral surface. Those of the second are also mucous glands,^ 

 long-p}Tiform in shape, metameric and symmetrical in their distribution, 

 and fairly constant in number (text fig. III). The glands of the third 

 type are non-mucous, very long-pyriform in shape, and found prin- 

 cipally near the middle of the trunk segments, and on the head. 



Muscles. — The muscles comprise two sets^ longitudinal and trans- 

 verse. The former are divided into three pairs. One pair lies close 

 together on the ventral side of the trunk, and traverses the latter from 

 the anus to the posterior side of the mouth. The second pair are 

 ventro-lateral in position and run from the anus to the anterior por- 



