DREPANOMENIA VAINIPYRELLA. 77 



the pericardial wall becomes thickened and numerous small folds appear which 

 converge and in some cases at least become continuous with the adjacent sec- 

 tion of the duct. A short distance beyond the pericardial cavity and as far 

 distally as the seminal receptacle each duct affords attachment for a vast num- 

 ber of glands of unknown function. These are slender diverticula (Plate 40, 

 fig. 2), composed of very small cells with indistinct boundaries filled with a finely 

 granular faintly staining secretion. In the present specimen large quantities of 

 spermatozoa are present in the coelomoducts and frequently these have made 

 their way into some of the diverticula where they form masses without definite 

 arrangement. Whether this is a normal occurrence or a post mortevi effect 

 cannot be definitely decided with the material in hand. Beyond these glands 

 the dorsal section of the coelomoduct becomes thin walled, without folds and soon 

 joins the ventral division which as Plate 39, fig. 2, indicates is of large size, thin 

 walled, with few folds and is crowded with sperms. Immediately ventral to 

 the union of the dorsal and ventral limb of each duct there is a small globular 

 outpouching to whose internal wall large numbers of spermatozoa are attached 

 so that in position and function it is to be considered as a seminal receptacle. 

 Sperms with the same mode of attachment are found in considerable numbers 

 adjacent to the seminal receptacles and rarely at much greater distances, even 

 as far as the undivided section or shell gland. The cavity of this last named 

 organ is not much larger than that of the dorsal section and its epithelial lining 

 is relatively thin but a multitude of glands, attached throughout its entire extent, 

 give it a heavy appearance. These glands are composed of compact, pear-shaped 

 cells arranged in lobules that open by intercellular channels in the epithelial 

 lining of the shell gland. As may be seen in Plate 39, fig. 2, the shell gland pushes 

 inward the anterior wall of the cloacal chamber so that its outlet is far within 

 this last named cavity. 



Drepanomenia vampyrella, sp. nov. 



This species is represented by a single specimen dredged off the southern 

 coast of Oahu Island (Sta. 3907) at a depth of 304-315 fath., where the tempera- 

 ture was 43.7 F. It was coiled tightly about a solitary polyp of Epizoanthus, 

 and further examination showed that the proboscis of the mollusc was protruded 

 through the body wall of the coelenterate, whose reproductive and other tissues 

 had been drawn into the alimentary canal of its captor. There is therefore no 

 doubt that this species is carnivorous and that its association with the actinian 

 is not an accidental one or a case of commensalism. 



