92 S. GOTO. 



the body (PL XVIII, fig. 3, a;), and the wall of which consists of a 

 thin refractive membrane, which bears at some points flattened nuclei. 

 I have not observed any connection of this canal with the excretory 

 vessel, and am at a loss to say what purpose it may serve. 



In Calicotyle also there is a bulbus ejaculatorius. It is situated on 

 the terminal portion of the vas deferens close to the penis, and is a 

 somewhat dumb-bell shaped organ consisting of a compact connective 

 tissue entirely separated from the surrounding mesenchyma by a 

 membrane. The terminal rounded portions of the organ are hollow, 

 and these hollows seem to communicate with the vas deferens by a 

 very narrow canal, although on this point I am not able to make a 

 positive statement owing to the scantiness of material (Pi. XIX, 

 fig. 10).. Considering, however, the close afiinity of this genus to 

 Monocotyle, I think I am justified in calling the organ in question the 

 hulbus ejaculatorius. 



An ejaculatory organ similar to that of Monocotyle has been de- 

 scribed by St.-Remy'^ in Microbothrium . 



Penis — In many species the terminal portion of the vas deferens 

 is surrounded by a mass of connective tissue which presents a very 

 different appearance from the general mesenchyma of the body, and is 

 sometimes separated from it by a distinct membrane. This portion 

 deserves, in my opinion, the name of penis, but it is clearly to 

 be distinguished from the structure in connection with the genital 

 atrium hereafter to be described. In many species two portions can 

 again be distinguished in the penis, viz., a more distal, chitinous por- 

 tion and a more proximal portion consisting of ordinary connective 

 tissue or of a modification of it. The latter portion I shall call the 

 connective-tissue penis and the former the chitinous penis. 



1). G-. St.-E.emy— Etude de I'appareil genital, etc., p. 31. 



