SUBULINA. 299 
Var. strebeli. 
Stenogyra (Subulina) trochlea, Pfr.?, v. Mart. in Malak. Blatt. xii. p. 49 (1865) *. 
Subulina trochlea, no. 2, Strebel, loc. cit. p. 116, t. 7. fig. 16 (right figure, magnified) **. 
Somewhat longer (25-26 millim.), with more whorls (11-12) and a comparatively small aperture. 
Hab. CAMPECHE: in the court of a house (Berendt 23). 
The locality Vera Cruz quoted by me 22 is incorrect, C. Friedel having received his 
specimen from Berendt himself, as stated by Strebel 23. 
Var. trochlea. (Tab. XVII. figg. 18, 18 a, 13 0.) 
Achatina trochlea, Pfr. Symb. Hist. Helic. ii. p. 59 (1842) **; Monogr. Helic. Vivent. ii. p. 266” ; 
Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Bulimus and Achatina, p. 348, t. 87. 
figg. 23, 24°°. 
Subulina trochiea, form A, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p. 115, t. 7. fig. 16 
(left figure, magnified), t. 17. fig. 832 (aperture), t. 18. figg.1 (radula), 12-16 and 18-24 
(anatomical details) *’. 
? Stenogyra octona, Angas, P. Z. S. 1879, p. 485, t. 40. fig. 16 (living animal) *, 
A little longer than the normal specimens of S. octona, the last whorl seen from the dorsal side distinctly 
higher than broad. 
Hab. Muxico (Hegewisch 74—*7), 
S.E. Mexico: Teapa in Tabasco (H. H. Smith). 
Yucatan: Merida (Ravensburg *"). 
S.E. Costa Rica: Old Harbour (add 28). 
S.W. Costa Rica: wood of Palmar in the valley of the Rio Grande de Terraba, at 
the roots of large trees (Pittier). 
According to Pfeiffer 2°, his S. trochlea is distinct from S. octona by the broader and 
more convex whorls, a more concave columellar margin, and a more elliptic form of 
the aperture. To judge from his figure ?%, the whole shell is comparatively more 
slender, especially the last whorl, which, seen from the dorsal side, is higher than 
broad, whereas in S. octona it is as broad as high. Strebel *’, who had before him 
specimens of 8S. trochlea from Pfeiffer’s collection, identifies them with those fiom 
Merida which he describes and figures, and also with others from Cuba, Jamaica, and 
Brazil, labelled “S. octona,” and states that he does not know any other S. octona. 
Specimens of 3. trochlea in the collection of Dunker, Pfeiffer’s friend, do not differ at 
all from S. octona. The difference between his S. trochlea and the widely-spread 
S. octona cannot, therefore, be very essential. Strebel’s figure also shows the last 
whorl somewhat higher than broad, so I use this character and the larger size to 
define the variety trochlea, and refer to it some specimens from Tabasco and Costa 
Rica; in the convexity of the whorls and curvature of the columellar margin I find 
no constant difference. The measurements are :-— 
38* 
