ENCHYTR^ID^ 



69 



distinct, XI to XIII, saddle-shaped. Septal glands in IV, V and VI. 

 Peptonephridia short and undivided. Brain posteriorly slightly con- 

 cave, oblong. Dorsal vessel rises in XV, but separates only in XII. 

 Esophagus gradually emerging in the sacculated 

 intestine. Spermathecs w^ith long stalk and a 

 lopsided ampulla connecting with the intestine. 

 Sperm-funnels short, bent. Sperm-ducts nar- 

 row, coiled, in XII and XI, opening on the side 

 of small penial papillae. A pair of large inte- 

 rior penial papillae near the male pores. Ncph- 

 ridia large, rounded, with granular neck and 

 greatly coiled duct. Anteseptal consists merely 

 of the nephrostome. Lymphocytes of two 

 forms, rounded-oval and tapering. Both are 

 erythrophil. Color white. 



Locality. — Garforth Island, Muir Inlet, Gla- 

 cier Bay, Alaska, June 9, 1899, Prof. W. E. 

 Ritter. 



DETAILED DESCRIPTION. 



Penial interior fapillce. — The most interest- 

 ing features of the species of this genus are 

 the structure of these organs. The penial in- 

 terior papilla is in itself very small, and con- 

 sists of two unequal papillae, between which 

 the sperm-ducts open. The smaller is situated 

 close to the body-wall (p1. xix, fig. 4), while 

 the larger is situated nearer the ventral gang- 

 lion. The sperm-ducts open between these two 

 papillae. There are numerous muscles between 

 the two papillae as well as between the sperm-duct and the papillse. 

 The papillae contain only one kind of glands, which do not open into 

 any lumen, but onto the exterior surface of the body. No glands open 

 into the sperm-duct. Besides these comparatively small penial papillae 

 we find located more centrally two larger penial papillae close to the ven- 

 tral ganglion (p1. xix, fig. 6) . In a transverse section of the body of the 

 worm these penial papillae are not cut at the same time as the other 

 penial papillae, the latter being situated a little anterior to the former. 

 The penial papillae are all of the same general structure and contain a 

 number of unicellular glands arranged in many isolated bunches, each 

 bunch opening separately from the other. Between these papilla are 



Fig. 



39. Enchytrceus 

 alaskce. 



