208 NEOMENIA VERRILLI. 



on the lateral and ventral surfaces of the pharynx, extend longitudinally to a 

 point probably corresponding to the posterior end of the pharyngeal tube where 

 they terminate as abruptly as they began (Plate 3, fig. 4). All of these folds 

 are deeply furrowed with secondary ridges, and are supported by an abundance 

 of muscle and connective tissue, which Ukewise give support to a' large number 

 or gland cells. These last named elements appear to be grouped in the form 

 of slender lobules, but the protoplasm of which they are composed stains but 

 faintly, and their relations with the overlying epithelium are obscure. At 

 several points what appear to be ductules are evident, and a darkly staining secre- 

 tion on the exposed surface of the pharyngeal epitheUum indicates that the 

 products from these cells escape as usual by intercellular channels. 



As noted in the foregoing paragraph the large pharyngeal folds end abruptly 

 posteriorly; and immediately behind them a large circular fold arises com- 

 posed of muscle and connective tissue penetrated by blood sinuses. This fold 

 appears to be capable of a certain amount of protrusion, but owing to the lack 

 of well-defined protractors and retractors its movement is probably Umited. 

 The lining epithelium is composed of high, slender cells charged distally with a 

 granular secretion not encountered elsewhere in the digestive tract. Distinct 

 ventral salivary glands are absent, and it is possible that these cells are homolo- 

 gous or at all events that they perform a similar function. 



No radula is present. 



Beyond this circular fold the stomach-intestine appears with walls fash- 

 ioned into numerous longitudinal folds Hned internally with digestive cells 

 without distinct boundaries and densely packed with innumerable granules. 

 Along the mid-ventral line the cells of this character blend insensibly with 

 others, almost cubical in form, and non-glandular, that anteriorly form a narrow 

 trough-Uke tract which nearer the middle of the body develops folds and in this 

 condition extends to the region of the seminal receptacles. Here the intestine 

 narrows to pass between the Umbs of the coelomoducts, and this non-glandular 

 portion of the gut gradually extends toward the dorsal side until at the anal 

 opening it comprises fully half of the digestive tube. The mutilation of the 

 specimen renders it impossible to state with certainty, but it appears that the 

 dorsal glandular tract does not disappear until the cloacal chamber is reached. 



The cloacal cavity is a spacious chamber, and as in other species of the 

 genus its walls are provided with extensive branchial folds (Plate 4, fig. 5), 

 nimibering apparently between fifteen and twenty pairs. These in turn are" 

 often supplied with many secondary folds, the appearance in cross section 

 reminding one strongly of ctenidia. 



