THE CARNIVOROUS SLUGS OF SOUTH AFRICA. 209 



Internal Characters. — Skin thick. Shell (PI. XIII, 

 figs. 47, 48) 1*2 X "6 mm. (in the immature specimen whose 

 measurements are given above), thin and translucent, very 

 convex ; apex rounded, overhanging the posterior margin to 

 a considerable extent ; sinus shalloAv. 



Pedal gland (PI. XIII, fig. 55). — Glandular throughout its 

 entire length. 



Nervous system. — The various ganglia more distinctly 

 separate than in most species of A per a; buccal ganglia 

 situated posteriorly, joined to cerebral ganglia by compara- 

 tively short connectives. 



Digestive System (PI. XIII, fig. 55; text-fig. 4, c, p. 161). 

 — Radula (of immature specimen) 1'8 mm. long; teeth less 

 numerous than in most species ; central tooth small ; three 

 or four laterals with very short cusps, and about four times 

 as many marginals with longer narrower cusps, on each side ; 

 formula (of immature specimen) : (18 + 1 H- 18) x 41. Odonto- 

 phore with single buccal i-etractor. (Esophagus narrow ; 

 loops of intestine nearly vertical, mainly on the left side of 

 the liver. Salivary glands more or less united. 



Anterior aorta passing to the right of the intestine, 

 "posterior aorta" probably absent. Penial retractor 

 long, as in the next species. 



Habitat. — Table Mountain, Cape Town (scarce; Lightfoot). 



'J'ype. — The type is in the South African Museum, Cape 

 Town. An immature specimicn will be found in the Cambridge 

 University Museum of Zoology. 



Affinities, etc. — This rare species is the only member of 

 the genus that is known to occur in the west of the Cape 

 Province. In some respects it resembles Apera dimidia 

 more than any of the other species, but it diifers from both 

 A. dimidia and A. gibbon si in having the dorsal grooves 

 separate throughout their entire length, in the glandular 

 tissue extending to the terminal vesicle of the pedal gland, 

 and in the long penial retractor. In these features the 

 present form resembles the keeled species of Apera. Unfor- 

 tunately the reproductive organs of this species are practically 



