SIMPULOPSIS. | 253 
ComparRaTIVE TABLE OF THE SpEcIES oF SzrpuzoPsis. 
| 
Aperture. | 
Nomen. Figura. Sculptura. Coloratio. Long. | Diam. 
Alt. Diam 
obliq. . 
. mm. ; mm. | mm. | mm. 
simula, Morel. ...| mucronato-globosa. | oblique plicatula. | fulvo-virens. 11 9 7 6 
senea, Pfr. ......... depresse conico- | confertissime stri- | pellucida, seneo- 54 9 7 5 
globosa. ata. micans. 
cumingi, Pfr. ...| subglobosa, leviter et irregula- | viventi-cornea. 12 204 14 15 
riter plicatula. 
1. Simpulopsis simula. 
Bulimus simulus, Morelet, Test. Noviss. ii. p. 11 (1851)*; Pfr. Monogr. Helic. Vivent. ili. p. 3837. 
Simpulopsis simula, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 578, t. 24. fige. 18,13 a’°. 
Hab. N. Guatemata: Peten, in woods, on the leaves of trees (Morelet !-°). 
2. Simpulopsis cnea. 
Simpulopsis enea, Pfr. P. Z. S. 1861, p. 27*; Malak. Blatt. viii. p. 84 (1861) *; Monogr. Helic. 
Vivent. v. p. 22°; Reeve, Conch. Icon. xiii., Simpulopsis, t. 1. fig. 7*; Fisch. & Crosse, 
Miss. Scient. Mex., Mollusca, i. p. 580, t. 24. figg. 12, 12 a, 5’. 
Hab. S. CentrRat Mexico: Parada, in the State of Oaxaca (Sallé }~). 
3. Simpulopsis cumingi. 
Simpulopsis cumingi, Pfr. P. Z. S. 1861, p. 27, t. 8. fig. 2*; Malak. Blatt. viii. p. 84 (1861) °; 
Monogr. Helic. Vivent. v. p. 22°; Reeve, Conch. Icon. xiii., Simpulopsis, t.1. fig. 5°. 
Hab. Mexico, without nearer indication of locality 1~*. 
Fam. CYLINDRELLIDZ. 
Shell turrite, with many gradually increasing whorls; aperture more or less circular, 
with continuous’ edges all round, often drawn out freely beyond the junction of the 
last whorl with the penultimate whorl. Jaw and radula agreeing generally with 
that of the Aulacognatha (anted, p. 126) and Pupide (infra), in the genera which are 
characteristic aud confined to Central America, as Hucalodium, Celocentrum, and 
Holospira, but peculiarly modified in Cylindrella and Macroceramus, which both belong 
essentially to the West Indian Islands and are represented on the mainland of America 
by very few species. ‘The differences and analogies between these two groups are given 
at length by H. Strebel [Beitr. Mex. Land- und Siissw.-Conch. iv. p. 52 (1880), &c.], 
who has shown that the Eucalodiine and Cylindrellide are not so sharply defined as 
P. Fischer and Crosse supposed. In Eucalodiwm, Celocentrum, and most species of 
