ENCHYTR^ID^ 



41 



penial bulb consists exclusively of muscular tissue, and contains no 

 glands. Sperm-funnels arc thin and long, and doubled on themselves. 

 Both testes and ovaries arc lobed. The testes are connected with each 

 other ventrally. Sperm-sacs are thin, entirely confined to the ventral 

 side of the coelom. Lymphocytes are small, elongated ovoid, numer- 

 ous. Nephridia possess one lobe considerably larger than the other. 

 Color gray. Whole body pigmented. 



Locality. — Ice-House Lake, St. Paul Island, Bering Sea, Alaska. 

 Collected by Prof. Trevor Kincaid, for whom I have the pleasure of 

 naming the species. 



Characteristics. — The most prominent character of this species is 

 the complete absence of glands connected with the efferent apparatus. 

 Even inside the penial bulb there is nothing but connective tissue and 

 muscular strands surrounding the lower part of the sperm-duct. 



DETAILED DESCRIPTION. 



Septal glands . — In transverse sections of the body it is seen that 

 the septal glands are much lobed and consist of two or three folds of 

 unequal sizes. Each lobe is made up of a row of glandular cells along 

 each margin. 



Dorsal vessel. — So far as I can judge from a series of cross-sec- 

 tions, the dorsal vessel appears to rise in XV. It is thinly covered with 

 very short chloragogen glands. A single row of similar short glands 

 covers also the intestine. The epithelial cells of the intestine of about 

 the same length as the chloragogen cells. A continuous blood-sinus 

 in the intestine, at least in the clitellar somites. 



Spermathecce (fig. 17? ^)' — The junction of the spermathecae and 

 the intestine on the dorsal median line of the intestine. Muscular duct 

 of the spermatheca short. The club-shaped diverticles are of the 

 same length as the ampulla. 



Sperm-ducts (p1. vii, fig. 7). — As in many Mesenchytraeids, the 

 sperm-ducts extend posteriorly through several somites, in this species 

 as far back as XV. This would make the sperm-ducts about seven 

 times as long as the funnel. They end at the place where the sperm- 

 sacs suddenly widen out. Sperm-duct widens slightly as it enters the 

 penial bulb ; no atrium, as in some species, nor can I detect any glands 

 connected with the penial chamber. The penial bulb consists of a 

 thickening of the longitudinal muscular layer of the body and contains 

 principally connective tissue interwoven with muscle fibers. When 

 retracted it projects to or slightly beyond the center of the coelomic 

 cavity. 



