212 NEOMENIA VERRILLI. 



moderate height and in addition to containing small amounts of some finely- 

 granular substance support a well-defined cifiated coat. 



At the junction of the dorsal and ventral divisions of the coelomoducts 

 on each side is a large vesicular appendage (re) that probably functions as a 

 seminal receptacle since each contains a very few spermatozoa together with a 

 small amount of some glandular secretion. The walls of the neck-like duct 

 are similar to those of the dorsal Hmb of the coelomoduct, and are heavily ciU- 

 ated, as are the cells of the receptacle adjacent to it. On the other hand 

 the walls of the expanded portion comprise cells of two types, goblet-shaped 

 glandular elements with basal or subcentral nuclei, and exceedingly slender 

 supporting cells. The secretion of the first named class is restricted to the 

 distal half of the cell, and from its homogeneous appearance and seemingly 

 viscous character probably exists in the form of a fluid in Uving material. 



The ventral Umbs of the coelomoducts hold the customary relation to 

 the other organs in the posterior end of the body, and are not only of relatively 

 small diameter but the walls are comparatively thin. From the quantities 

 of secretion imbedded in the walls it appears probable that this is the usual 

 state of affairs. The epithelial lining is thrown into folds of varying sizes each 

 supported usually by fibres sent in from the sheath surrounding the organ. 

 The cells are high, slender elements with the distal portion containing groups 

 of small granules staining moderately with Delafield's haematoxyUn. This 

 state of affairs continues to the median, undivided section where the cells become 

 more nearly cubical especially in the neighborhood of the opening into the 

 cloacal chamber. The external reproductive pore does not communicate 

 directly with the general cloacal cavity, but with a compartment of it that in 

 turn gives rise to the diverticula responsible for the development of the penial 

 spines. Ventrally this same space leads into a heavy tubular outgrowth termed 

 by Wiren (1892) the vagina or copulation organ. 



The so-called vagina (co) is a diverticulum of the anterior cloacal wall 

 reinforced with a heavy muscular sheath. The muscular elements comprise 

 three classes, an innermost, heavy circular layer external to which is a thin 

 covering of longitudinal fibres, while here and there small, radiating bundles 

 extend through these layers from the neighborhood of the inner epithelial lin- 

 ing. The internal bounding membrane consists of slender, ciliated cells, appar- 

 ently slightly glandular, produced into numerous small folds. Along the mid- 

 ventral line the muscular sheaths are pushed inward, thus producing a species 

 of typhlosole that continues throughout the greater part of the organ. 



Distally the vagina opens into a pair of relatively large sac-like organs 



