COLLINGK : ON THE ANATOMY OF THE GENUS MYOTESTA. 13 



seminis opens into it, the receptacular duct imperceptibly passing into 

 the expanded head. The free-oviduct is short. The penis is a long, 

 thick-walled, muscular organ, at its distal end there is a short, thick, 

 retractor muscle which arises from the right body-wall at the anterior 

 end of the body-cavity ; beyond the region of insertion of this muscle 

 the lumen of the penis is continued into the epiphallus from which 

 two small diverticula arise (PI. i, fig. 4, div.), the first and smaller is a 

 simple caecal outgrowth, the second is slightly larger, thicker, and 

 more muscular, both were very carefully examined but were not found 

 to contain anything. Beyond these diverticula the epiphallus expands, 

 into a club-shaped body and contains a few, irregular shaped, 

 calcareous particles. From the inner side of the epiphallus a short 

 vas deferens connects this organ with the prostatic canal. When 

 dissected the penis is seen to have a lumen agreeing closely with 

 its external form. The oviducal portion of the common duct is large 

 and folded upon itself. The hermaphrodite gland lies embedded in 

 the "liver," and occupies a position considerably more posterior than 

 the rest of the generative organs ; the duct is short and sliL^htly 

 convoluted. The albumen gland is comparatively small. 



Myotesta punctata, ciige. 

 PI. I, figs. 5— II. 



Mijoteda inmciaia., Cllge. : Journ. of Malac, 1901, vol. vii, 

 p. 119. 

 Animal a deep brown with a few yellowish, somewhat stellate spots ; 

 head and tentacles dark blue ; mantle brown with few dark blotches and 

 spotted with yellow. Peripodial groove ill-defined. Foot-fringe 

 yellowish-brown with closely set lineoles. Foot-sole, lateral planes 

 brownish with yellow maculations, median plane dirty brown and 

 smooth. 



Length (in alcohol) 34 millim., breadth of foot-sole 4 millim. 



The Generatim Oiyans (PI. i, figs. 8-11). — In this species the 

 generative organs differ considerably from those in M. fnihsfor/eri. 

 There is a wide vestibule into which the short vagina opens on the 

 left, the penis papilla protruding into it on the right (PI. i, fig. 9). 

 The receptaculum seminis is much larger than in the preceding 

 species, as also its duct, which is probably due to the fact that here it 

 was fully distended by its contents, and contained a well-developed 

 spermatophore (PI. i, fig. 10). This body consists of a spirally 

 wound tube with numerous, and variously shaped, spines studded over its 

 surface ; some of these spines are quite simple (Fig. i la.), while others 

 are much more complicated (Fig. 11 b-f.), the most varied consisting 



