STROPHOMENIA FARCIMEN. 121 



usual regularity of other Neomeniina and frequently present a more than usually 

 complicated appearance in cross section. In the posterior end of the body the 

 gut narrows, and becoming triangular (Plate 17, figs. 14, 15), passes between the 

 cloacal passage and finally becoming reduced to a small, apparently ciliated 

 canal it opens together with the coelomoducts into a depression in the anterior 

 cloacal wall. 



The ventral salivary glands are long tubular bodies opening into the pharyn- 

 geal cavity on each side of the radula (Plate 17, fig. 16). In their proximal 

 portions they are delicate thin walled canals lacking any signs of glandular 

 activity; more distally these tubes continue in an unchanged condition, but 

 each becomes enveloped excentrically in a mass of gland cells. These elements 

 are pyriform, filled with a finely granular, lavender colored secretion, which 

 makes its way into the duct by means of ductules opening through intercellular 

 canals. 



The heart is of relatively great length, and, with the exception of a few 

 irregular outpouchings near its posterior extremity, is tubular throughout. 

 There is thus no clearly defined auricle and ventricle nor line of tlemarcation 

 between it and the aorta. This last named vessel is of exceptionally large 

 calibre, but its relation to the gonad and its route into the perivisceral sinus are 

 normal. This last named space, owing to the unusually small number of muscle 

 bundles binding the gut to the body wall, is of large size, but the course of the 

 included blood into the median pedal sinus and posteriorly into the heart are 

 typical. The blood corpuscles are thin, plate-like bodies, usually like a spear- 

 head in shape, and rather closely resemble those of Strophnmcma scandens. 



The nervous system, as it is not especially favorable for study, has been 

 studied in a general way only, but sufficiently to indicate that it is not essentially 

 different in this regard from other species of the genus. 



The gonad extends as far forward as the radula where its halves are widely 

 separated by the large aorta, but more posteriorly they come in contact beneath 

 this vessel. The animals are dioecious and the sex cells are developed normally. 

 The coelomoducts take their origin from the extreme posterior border of the 

 pericardium (Plate 11, fig. 4) in the form of comparatively thin walled tubes in 

 which the lining epithelium is low and seemingly ciliated. Extending anteriorly 

 this dorsal division of the cloacal passage unites with the ventral section about 

 the level of the anterior end of the pericardial cavity. At the intersection of 

 these two divisions upwards of nineteen seminal receptacles are attached, in 

 appearance and arrangement closely resembling those in Sirophomenia scandens. 



