24 On the Generative System in the Genus Testacella. 



are fertilized in this broad poucli-like portion. The herma- 

 phrodite gland is slightly larger than in T. haliotidea and the 

 duct longer. 



Testacella Maugei^ Fer. (PI. I. fig. 3.) 



In this species the vestibule and vagina are rather 

 easier to distinguish than in the preceding one. At the 

 junction of the two organs the penis passes off; it commences 

 as a narrow tube, and then broadens out into an expanded 

 head. It is much longer than in T. scutulmn. The vas 

 deferens previous to entering the prostate is thrown into a 

 series of convolutions ; these were characteristic of all the 

 specimens dissected and quite unlike anything I have pre- 

 viously seen in this organ. The receptacular duct commences 

 as an ovoid dilatation from the vagina, and is continued as a 

 long narrow tube, which enters the receptaculum seminis 

 laterally, reminding one somewhat of the condition in Avion 

 fasciatuSj Nils., only the shape here is oval, and not tapering 

 and pointed as in that species. The oviduct and prostate- are 

 sharply folded upon each other, a character fairly constant. 

 The hermaphrodite gland is somewhat triangular in shape 

 and readily distinguishable from that organ in either of the 

 two preceding species. 



Variation, 



Although a large number of specimens of each species have 

 been dissected, the amount of variation noted in any indi- 

 vidual species was very slight and unimportant. 



In T. haliotidea the flagellum exhibits a series of minor 

 variations, being either a straight tapering tube with the distal 

 portion sometimes dilated, or it forms a dilatation at an angle 

 to the general body, not imlike the head of a golf-stick. I 

 have already referred to the variation in the form of the penis 

 (PI. I. fig. 4). 



In T. scutulum the penal retractor muscle often exhibited a 

 division into two portions, while in others there was a small 

 retractor muscle given off below the ordinary one. 



Summary. 



_ There are certain resemblances in the form of the genera- 

 tive organs in T. scutulum which connect it with T. Maugei, 

 such as : — 



a. The dilatation of the proximal portion of the recep- 

 tacular duct. 



