STREPTOSTYLA. 97 
The figure of 8. lurida, left by Shuttleworth and published in the posthumous second 
part of his ‘ Notitie Malacologicze,’ proves very clearly that this species is inseparable from 
S. bocourti, and that too much stress must not be placed on his words “ad suturam et 
ad basin pallida,” as this is scarcely to be seen in the coloured figure—at the base the 
paler colour seems only to be due to the columellar plait, which is dirty white in not 
very fresh specimens. Crosse and Fischer could not have seen this figure when they first 
described their S, docourti. 
In size, according to the different authors and the specimens which are before me, 
the Mexican examples vary between 131° and 15 millim. 1-4, the Guatemalan ones 
between 14° and 18, perhaps even 21 millim. !!; the difference is, therefore, not an 
absolute one. The type of the var. major, 23 millim., is said to be from Chiapas 11; I 
have not seen so large a specimen. 
e. Physeformes. 
16. Streptostyla delibuta. (Tab. V. figg. 18, 18 a.) 
Glandina delibuta, Morelet, Test. Noviss. ii. p. 18 (1851) ’°. 
Achatina (Glandina) delibuta, Pfr. Monogr. Helic. Vivent. iii. p. 508”. 
Oleacina delibuta, Gray, Cat. Pulm. p. 18°. 
Streptostyla delibuta, Fischer & Crosse, Miss. Scient. Mex., Mollusca, i. p. 44 *. 
Hab. N. Guatemata: Vera Paz, in woody districts (Morelet 14), 
EK. GuateMaLaA: Environs of Yzabal (Séo/0). 
Var. crassa. 
Streptostyla crassa, Strebel, Beitr. Mex. Land- und Siissw.-Conch. iii. p. 26, t. 9. figg. 2, 2a, 6°. 
Hab. N. Guatemata: Coban (Sarg and Salvin ®); Alta Vera Paz (Stol/). 
The suture becomes very obliquely descending and distinctly margined (accompanied 
by an impressed line) in the last whorl, but much less so in the preceding ones; the 
spire is a little concavely attenuated at about the third whorl, though on the whole 
rather broad and obtuse at the apex: “ delibutus,” anointed, from the greasy lustre of 
the surfaces. The figure here given is from a typical specimen kindly sent me by 
M. A. Morelet. 
17. Streptostyla ventricosula. (Tab. V. figg. 20, 21, 21 a.) 
Glandina ventricosula, Morelet, Test. Noviss. i. p. 15 (1849) *. 
Spiraxis (Glandina) ventricosula (Morel.), Pfr. Monogr. Helic. Vivent. il. p. 475”. 
Hab. Yucatan: Merida, with S. meridana (Morelet '?). 
Var. major. (Figg. 21, 21a.) 
Streptostyla binneyana, Crosse & Fischer, Journ. de Conch. xvii. p. 29 (1869) *; Fischer & Crosse, 
Miss. Scient. Mex., Mollusca, i. p. 29, t. 1. figg. 3, 3a*; Pfr. Monogr. Helic. Vivent. ii. 
p- 341°. 
BIOL. CENTR.-AMER., Terr. and Fluviat. Mollusca, February 1892. 13 
