Notes on South African Mollusca. 157 



with Miiller's originals: Diam. maj. 29-2, min. 23-2; alt. max. 

 20-0; apert. 16-7xl3-5 mm.; ends of peristome 7 mm. apart. 



Animal of specimens from Montagu, the shells of which measured 

 about 21 mm. in diameter, and a single, larger, but immature 

 specimen from Kommetje, which had a white shell. — 



Colour (in alcohol): foot and mantle-edge pale; top of head and 

 neck tinged with grey ; roof of mantle-cavity streaked and spotted 

 with dark grey, the pigment extending back over the pericardium, 

 but l)eing most abundant along the three principal blood-vessels and 

 near the rectum ; the mottling is coarser in the Kommetje specimen 

 than in those from Montagu. Left body-lobe consisting of two 

 divisions connected by a fold or ridge, the left division being broad 

 but very low, scarcely projecting further than the connecting fold. 

 Pulmonary veins showing a simple generalized arrangement. The 

 fold, which runs along the side of the rectum and projects into the 

 mantle-cavity next to the band of modified epithelium, is well 

 developed in this species and somewhat sinuous (PL IV., fig. 4). 



Cerebral ganglia covered with pale grey connective tissue. Jaw 

 (of the Kommetje specimen) 2-55 mm. long, rather thin, reddish 

 brown along the lower edge ; ends squarer and edges more nearly 

 parallel than in the preceding species. In a Montagu specimen the 

 jaw is similar, but smaller. Eadula (of a Montagu specimen) 

 5 X 2J mm. ; transverse rows of teeth nearly straight ; centrals 

 similar to the laterals, but a little smaller (PI. IV., fig. 13) ; formula 

 (43 _(_ 1 _|_ 43) X 114. In the Kommetje specimen the radula measures 

 6^ X 2 J mm., the teeth are larger, and the formula is (35 -f- 1 + 36) 

 X 113 Eadula-sac projecting beyond the buccal mass. 



Eeproductive system (PI. V., fig. 5): hermaphrodite duct swollen 

 and much convoluted ; vesicula seminalis rather long, curved, some- 

 what swollen distally but tapering proximally ; receptaculum seminis 

 oval, rather large ; receptacular duct crossing the anterior end of 

 the common duct, shorter than usual, and rather thick ; vagina 

 long ; vas deferens keeping to the left of the female duct, not 

 attached to the side of the penis ; epiphallus absent ; penis very 

 long, curved and contorted, the bends occupying diiferent positions 

 in different specimens ; rugae on the longitudinal folds inside the 

 penis larger but relatively flatter than in the other species, each 

 •crossed by a narrow white ridge (PI. IV., fig. 29). 



Hab. South-western districts of the Cape Pbovince. Montagu ; 

 Bredasdorp ; iVvontuur ; Hermanns ; Eabiesberg, Worcester Div. ; 

 Cape Peninsula, from Kalk Bay and Hout Bay to Cape Point. 



Type in Copenhagen Museum. 



