14 COLLINGE : ON THE ANATOMY OF THE GENUS MYOTESTA. 



of three branches rising from a common stem, each branch bifurcating 

 at its free end. The penis, proximally, consists of a wide, sac-like 

 sheath, into which the penis papilla protrudes, beyond this it narrows 

 and just before joining with the epiphallus widens out into a bulbous 

 head. The epiphallus is slightly longer than in M. fnihfiforferi and it 

 exhibits no diverticula ; it is widest about its middle. The vas 

 deferens is longer than in the preceding species. The common duct 

 exhibits two sharp folds. No retractor muscle of the penis could be 

 traced. The hermaphrodite duct is rather longer than in M. 

 fruhdorferi, so that the hermaphrodite gland lies embedded in the 

 "liver," close to the side of the intestine, much more dorsally and 

 posteriorly than the remaining portions of the generative organs. 



Since the above description was written, I have received from 

 Dr. H. Simroth a short paper ^ on a remarkable new species of 

 Stylommatophora, to which he gives the name Odracolefhe frulit^forfferi, 

 gen. et sp. nov., and from his description I am inclined to think that 

 this animal is what I have named Myotesta fruJistorfferi, although there 

 are certain features in the anatomy described by him, which I have 

 failed to find in my specimen. In both cases the specimens were 

 received from Mr. Fruhstorfer, and collected in Tonkin. 



Describing the generative organs Dr Simroth writes, "The vas 

 deferens has, before it passes into the penis, three short, thick flagella ; 

 the penis resembles that of the Pannarion group, such as Micropar- 

 marion, Its retractor originates neither on the left, nor by the 

 diaphragm, but further forward, quite close to the inner root of the 

 right ommatophore. The vas deferens, after running separately for 

 a time near the oviduct, enters and is blended with it. This portion, 

 which is attached by muscles to the right-wall of the body, is I regret 

 not clearly defined in this specimen, although it has been most carefully 

 dissected. However, the following facts are clear : P>om the point of 

 origin there proceed two cords, of which one is the normal seminal 

 duct, which can be traced as far as the near end of the penis, the 

 other turns to thick muscle underneath and penetrt<tcs to the distal 

 extremity of the penis. This muscle seems to contain a fine canal, 

 which may serve for internal imj)regnati()n, as is the case with many 

 other robber pulmonates, but in a somewhat different fashion. But the 

 most remarkable peculiarity lies in the fact that, near the point of 

 origin, in the adhering muscle, there are a number of plate-shaped discs 



2. Zool. A"z., igoi (Dec. 30), Bd. xxv, pp. 62 — 64.° 



