SMITH : MOLLUSCA OF TRINIDAD. 235 
2.—Subulina (Nothus) simplex Guppy. Pl. VIIL, f. 1. 
Spiraxis simplex Guppy, Ann. Mag. Nat. Hist.,. 1868, vol. 1., 
Pp. 438 
Spiraxis simplex Guppy, Crosse, J. de Conch., 1890, p. 37. 
Spiraxis simplex Guppy, Journ. of Conch., vol. vil., p. 212. 
Hab.: Trinidad (Guppy); Oropouche, Trinidad (Ponsonby 
in Brit. Mus.). 
This species, placed by Guppy in the genus Sfrraxvis, 
appears to be referable rather to the genus Swédwlina. In 
Spiraxis, of which Achatina inusitata C. B. Adams should be 
regarded as the type, there is a columellar ‘spiral lamina” at 
the upper part of the columella, which is absent in Swdu/ina. 
In the latter, the columella is more or less distinctly truncate 
anteriorly, and has no spiral fold above. In this respect, 
Spiraxis simplex agrees with the well-known <Achatina octona, 
which is commonly located in the genus Swdulina. It seems, 
therefore, advisable to place the present species in that genus 
rather than in Spiraxis. If the group Vofhus of Albers (type 
Bulimis anomalus Pfr.) be considered separable from Swdulina 
on account of the reflexed columellar lip, forming an umbilical 
perforation, then this species should be placed in that section. 
2a.—Subulina (Nothus) Urichi. Pl. VIIL., f. 2 
Testa elongata, turrita, angusta, rimata, pallida, pellucida, 
nitida, striis tncrementi tenutbius obliquis arcuatis sculpta ; 
anfractus 8 mediocriter convext, ad suturam crenulatt , 
spira producta, ad apice subobtusa; apertura parva, in- 
wer se- aurijormis, longit. totius, 1 fere adequans ; labrum 
tenutssimium, obligute- -arcuatum : poleanne “a rectiuscula, superne 
anguste reflexa, infra medium subtruncata vel plicata. 
Longit. 104 millim., diam. 3, apertura fere 3 longa. 
Hab.: Oropouche (in coll. J. H. Ponsonby). 
Rather larger than Ofeas mucra (= octonoides C. B. Ad.), 
more glossy, and with a plicate or subtruncate columella. 
Smaller and more slender than JS. s/mf/ex, also with finer lines 
