BY tt. L. kkstkven. 677 



enlarged ends just mentioned, are I'ound free in the lumen ol the 

 gut. This calls to mind the secretion from the digestive glands of 

 Molluscs and Crustaceans as described by MacMunn(4) ; and the 

 histological resemblance between the epithelium here, and that 

 of Limax(/.c.), is doubtless correlated with similarity of function. 

 This epithelium recalls that of Lenuna branchialis Linn., as de- 

 scribed by A. Scott (7). 



The remainder of the digestive tract is lined by a minutely 

 granular, squamous epithelium, which, however, becomes cubical 

 and even columnar at the constrictions. The continuity of the 

 epithelium on the dorsal wall of the second compartment is broken 

 by the orifices of a cluster of elongated, cylindrical, unicellular 

 glands ; in fact, so numerous are these, that it would be as correct 

 to say that thej^ constitute the dorsal epithelium in this situation. 

 The form of these cells is depicted in Fig. 26; their cytoplasm is 

 finely granular, and their nuclei, as in the cells of the subdermal 

 glands, appear disproportionately small. 



The blind termination of the digestive tract is succeeded by a 

 fibrous strand, the remnant of an aborted rectum. 



In the absence of a fully developed digestive gland, the glan- 

 dular first compartment may perhaps be regarded as its homologue 

 as well as analogue. 



Nervous System. — As in the adult Leryiffa, there are no ele- 

 ments present which can be recognised as nervous. 



Eeproductive Organs. — The disposition of these organs is essen- 

 tially similar in the two sexes. Paired reproductive glands are 

 situated on either side of the anterior portion of the first compart- 

 ment of tlie digestive tract; the glands are hollow, when not filled by 

 reproductive cells, and communicate, without any intervening con- 

 striction, with oviduct or vas deferens. The situation of the exter- 

 nal orifices has already been described. 



The situation of the oviduct, which is the same as that of the 

 vas, can be gathered by a reference to the diagram (Fig. 1), and 

 the various figures of the transverse sections (Figs. 20 to 25). The 

 oviduct presents two well-differentiated segments. The anterior, 

 which is apparently uterus rather than oviduct, is of large lumen, is 



