232 Annals of the South African Museum. 



further drawing of that in a specimen from Cape Town (plate XIV. ^ 

 figs. 11, 11a) and for comparison with 0. ijolyininctata an internal 

 view, and a figure of the alimentary canal (plate XIV., figs. 6, 12), 



OOPELTA POLYPUNCTATA, n. Sp., 



Plate XIV., figs. 3, 4, 7-10. 



Animal greyish-yellow. Body marked by a series of oblique back- 

 wardly directed furrows 2-2-5 mm. apart. Mantle ovoid, slightly 

 produced anteriorly and posteriorly, spotted with numerous (43-71) 

 black dots, and has a decided greenish tinge. Dorsum flattish, no 

 trace of a keel. Tail flattened and produced backward. Eugas smalL 

 Peripodial groove distinct. Foot-fringe and foot-sole yellowish^ 

 no lineoles or division into median and lateral planes. Generative 

 orifice a large crescentic-shaped opening. Length (in alcohol) 

 52 mm. ; mantle 19 mm. 



Hah. Caledon Div., Zonder End, E. F. Purcell, 6985. 



After a careful study of a large series of specimens of 0. nigro- 

 punctata, Morch, I have been forced to recognise this as a distinct 

 species. Externally it is very like light-coloured specimens of 

 0. nigropunctata, only there are more black dots on the mantle. 

 Internally, however, the form of the generative organs, particularly 

 the sperm-duct, leaves little doubt as to its distinctness. There are 

 also some minor differences in the form of the alimentary canal. 



Alimentary Canal (plate XIV., fig. 5). The buccal cavity is short 

 and is followed by a short oesophagus, and wide, thin-walled crop, 

 which opens into the somewhat small, almost spherical sac, the 

 stomach, on the left side of which the intestine passes off lying 

 dorsal to the crop. Anteriorly a backward bend throws the intestine 

 to the region of the stomach again ; it then passes forward again as 

 the rectum. Lying over the region of the cesophagus are the salivary 

 glands, which are fused in the mid-dorsal line. 



Compared with the intestinal tract in 0. nigroinonctata (^la^te XIV., 

 fig. 6) it will be noticed that there are slight differences in the various 

 regions, and particularly in the shape of the stomach. 



Generative Organs. — These differ considerably from those in 

 0. nigropunctata. The generative orifice is conspicuous as a wide, 

 crescent-shaped opening leading into a small vestibule, from the right 

 side of which a short, wide tube is given off" which leads into the 

 sperm-duct (plate XIV., fig. 7). Viewed externally it is seen to con- 

 sist of two portions, which for purposes of description may be termed 

 the anterior and posterior divisions ; the latter appears as a wide sac. 



