Notes on South African Nollusca. 151 



the foot ; mantle-edge a darker shade of grey ; roof of mantle- 

 cavity unpigmented. Body-lobes very small, the two divisions of 

 the left lobe being represented by a small low ridge near the 

 respiratory opening, and a little triangular flap on the left side of 

 the animal. Pulmonary veins similar to those of the next species, 

 the first branch of the pericardial vein arising nearer to the main 

 pulmonary vein than in T. globulus (of. PI. IV., fig. 2). 



Cerebral ganglia covered with pale grey connective tissue. Jaw 

 3-65 mm. long, thick, dark brown (PL IV., fig. 18). Eadula 

 7fx4| mm.; transverse rows of teeth nearly straight; centrals 

 with rather broad bases and narrow median cusps (PI. IV., fig. 10) ; 

 formula, (62 + 1 + 66) x 121. Radula-sac projecting beyond the 

 buccal mass. 



Eeproductive system (PI. V., fig. 2) : hermaphrodite duct slender, 

 closely convoluted ; vesicula seminalis club-shaped, rather thick, as in 

 T. globulus ; receptaculum seminis somewhat elongate ; receptacular 

 duct only very slightly swollen at the anterior end; vagina long and 

 rather narrow ; vas deferens slightly convoluted for only a very 

 short distance next to the epiphallus, instead of for nearly half the 

 length of the penis, as in the other species ; epiphallus very short ; 

 penis very abruptly curved near the hind end ; rugae on the 

 longitudinal folds inside the penis much broader than long, as in 

 T. gypsiniis and the two following species (cf. PI. IV., fig. 28). 



Hab. LITTLE NAMALAND. Between the Holgat and Orange 

 Rivers ; Koingnaas (Rogers). Port Nolloth ; Anenous (Day). 



Type in Copenhagen Museum. 



The shell figured is the only one known to have been taken in live 

 condition. Though a good average example of the species, it does 

 not quite equal Miiller's Type in size or exactly resemble it in all 

 detail. Dr. Jensen writes that the Type, an unicum, is an old, 

 somewhat worn specimen, upon which the sculpture only appears 

 locally, and the spire is a little obliquely deformed ; it has a rather 

 broader mouth and more pronounced wrinkled transverse sculpture 

 than the figured shell, but there is no doubt that the latter is to be 

 referred to H. rosacea, Mull. 



This species appears to be very variable in size, while the 

 comparative height of spire and strength of sculpture are by no 

 means constant ; in some examples the malleation is so pronounced 

 as almost) to efface the striation, while in others there is little 

 malleation and the striation is far more clear. In all specimens 

 which I have seen, however, the shell is globose in shape, as 

 compared with the more elongate T. porpliyrostoma, and the 



