92 



s. GOTO. 



the body (PI. XVIII, fig. 3, .r), 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 Calicot[ilc also there is a hulhus ejacidatoriiis. 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 liollow, 

 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 affinity of this genus to 

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

 bulbils ejaadatorius. 



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

 scribed by St.-Pemy'-* m MicrohoiltriunK 



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. I'liis [)ortion 

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

 be distinguished from the structure in connection w^ith the genital 

 atrium hei'eafter to be described. In many species two portions can 

 again be distinguished in the penis, viz., a more distal, cliitinoiis 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 

 conned ive-iissuc penis and the former the chitinoiis penis. 



1). G. St.-Eeuiy— Etude de l'appareil génital, etc., p. 31. 



