190 TRICHODINA. 



less strong and regular, begin to be cut by weak spirals, and 

 pass into the general sculpture of the rest of the shell. This 

 sculpture consists of fine, irregular, rather sharp oblique 

 striae, coarser, stronger and arcuate just below the sutures, 

 and cut by numerous spiral lines, producing long granules. 

 In some specimens this decussation and granulation is very 

 distinct, in others it is scarcely visible. Figs. 21 and 22 are 

 copied from Morelet; fig. 23 is from an Anjouan example. 



10. T. SIMPULARIA (Morelet). PI. 57, fig. 28. 



Shell turrited, the apex acute, rather solid, irregularly sub- 

 striate, waxen, corneous-buff. Whorls 8%, scarcely convex, 

 the last rounded, tapering at base, two-sevenths the length; 

 suture linear, margined. Columella lightly arcuate, abruptly 

 truncate; aperture slightly oblique, semioval; peristome sim- 

 ple, acute, unexpanded. Length 15, diam. 4.5 mm. 



Comoro Is. : Mayotte, Moheli (Vesco) ; Anjouan (Bewsher). 



Achatina simpularia MOREL., Revue Zoologique p. 220 

 (1851) ; Series Conch, i, p. 70, pi. 5, f. 4; Journ. de Conchyl. 

 1877, p. 336. PFR., Monogr. iii, p. 496; iv, 613; vi, 233 

 Achatina pollens PFR., P. Z. S., 1856, p. 35; Monogr., iv, p. 

 613 ; Novit. Conch., p. 105, pi. 29, f . 19, 20. 



The glossy shell is marked with oblique, obsolete striae, more 

 apparent in the vicinity of the sutures ; and under a lens it 

 may be seen that the striae are crossed by indistinct lines, 

 sometimes very numerous in young shells. It was collected 

 at Mayotte under dead wood on the shore, at a cane field. The 

 specimens found at Anjouan are a little more delicate than 

 those of Moheli, but otherwise like them (Morelet). 



Achatina pattens Pf r., from Moheli, is considered a synonym 

 by Morelet. It is described as with 9 whorls, length 16, 

 diam. 4.75 mm., aperture 4.5 mm. long, 2.5 wide. In other 

 respects the description agrees with that of Morelet. The 

 type figure is copied, pi. 57, fig. 27. 



The position of this species is unknown to me, but it seems 

 to resemble T. cornea closely, and may be a diminutive mem- 

 ber of the same group. 



