STROPHOMENIA FARCIMEN. 119 



secretion that stains intensely and in this form makes its escape. In the poste- 

 rior sixth the cells are of essentially the same form, but their contents stain a 

 faint pink. As noted above the rectum opens with the halves of the shell 

 gland into a shallow depression on the forward wall of the cloaca. 



Strophomenia farcimen, sp. nov. 



Two specimens of this species were collected off the southern end of Honshu 

 Island, Japan (Sta. 3748), at a depth of 73-200 fathoms. One was attached 

 to a colony of the alcj'onarian, Acanthogorgia angustiflora; the other was likewise 

 clinging to a mass of a species of Dendronepthya (Spongodes). The length of 

 the type specimen (Plate 1, fig. 1) is 18 mm., width 2 mm. The color in formalde- 

 hyde is creamy white. A well-defined dorsal sense organ is present. From 

 external view the outlet of the anterior pedal gland is no wider than the ventral 

 furrow generally which is continuous with the cloaca. 



The cuticle, approximately one tenth the thickness of the total body width, 

 rests upon a hypodermal layer of unusual thinness (Plate 33, fig. 2), and is com- 

 posed of minute elements most unfavorable for study. The papillae are of mod- 

 erate size, and are attached to long fibrous stalks containing 3-5 nuclei and at the 

 surface of the cuticle are closely crowded together. At the junction of the stalk 

 and dilated portion as many as 5-9 nuclei may occur in a given section; the 

 remainder of the dilation is filled with numerous small greenish yellow granules. 

 The ordinary type of spicule, needle-like (Plate 17, fig. 17), forms 5-7 layers, 

 while the second type, usually with more truncated base and more curved acute 

 tip, is located more at right angles to the hypodermal layer. It is worthy of 

 note that the somatic musculature is exceptionally thin, the plump rounded 

 appearance of the specimens in hand being due to the firm consistency of the 

 cuticle. 



The anterior pedal gland, holding a position from the atrium to the hinder 

 border of the crypt-like outlet, is composed of lobules of small cells filled with a 

 faintly or darkly staining secretion according to the stage of its development. 

 The ductules make their way through intercellular spaces into the forward end 

 of the pedal furrow, which is comparatively small and in cross section usually 

 presents the appearance represented (Plate 17, fig. 11). Near its anterior border 

 the foot originates as a high slender fold and extends to the cloaca. Unlike 

 most species the cells of the posterior pedal gland open not only into the bottom 

 of the pedal furrow but also between the cells of the foot, which is provided also 

 with considerable numbers of gland cells. 



