198 HUGH WATSON. 



Internal Characters. — Glandular tissue of pedal gland 

 reaching" nearly as far back as the terminal vesicle. Radula 

 (PI. XX, fig. 126; text-fig. 3, b, p. 159) without central tooth; 

 cusps of teeth very strongly curved, slightly broadened towards 

 the points ; apophyses very prominent ; formula of a speci- 

 men from Equeefa : (28 + + 28) X 51; of a young example 

 from Equeefa : (24 -f + 24) x 44 ; of a specimen from 

 Durban: (34 + + 35) x 48. Liver sometimes shorter and 

 broader than in typical form (PL XXI, fig. 130). Penis 

 long and twisted (PI. XXIII, fig. 144). The anterior aorta 

 passes on the right of the intestine (PI. IX, fig. 27), and all 

 the other anatomical characters seem to be identical with those 

 of the typical form (PI. X, figs. 32, 33 ; PI. XIII, figs. 41, 

 42, 52; PL XIV, figs. 63-65, 67; PL XV, figs 70, 77-79; 

 PL XVII, figs. 93-98; PL XXII, figs. 138, 139, 142; PL 

 XXIII, figs. 145, 150). 



Habitat. — Equeefa, Natal (Burnup) ; Durban (under dead 

 leaves in the bush which fringes the shore; Burnup). 



Type. — The type of subspecies is in the Natal Museum, 

 Pietermaritzburg. Another specimen will be found in the 

 British Museum. 



Affinities, etc. — The chief characters Avliich distinguish this 

 form from Apera gibbonsi s.s. are its broader shape and 

 darker colour, its radula, and its penis (although it is not known 

 whether the penis of the typical form is always as short as 

 it is in the Zululand specimens). It is possible that this may 

 be a geographical variety of A. gibbonsi, as the two forms are 

 not known to occur in the same district, but the radulte are 

 so different as to suggest that this may prove to be a distinct 

 species. The single specimen from Durban differs from those 

 found at Equeefa in being without a paler dorsal band, in 

 having more teeth in each row in its radula, and in the penis 

 being abnormally reduced to a minute vestige. The resem- 

 blance of this specimen to certain dead leaves amongst those 

 under which it was found has already been referred to (see 

 p. 122) . Mr. Burnup informs me that this subspecies contracts 

 after the usual manner Avhen about to rest, instead of merely 



