CCLOCENTRUM. 271 
whorls 15-20 (12 in a specimen mentioned by Strebel ®, the length of which is 
35% millim.). 
The figure 6 in Reeve’s ‘ Conchologia Iconica’ represents a specimen which is not 
truncated at all, 63 millim. in length, with 31 whorls. 
Var. rufescens,n. (Tab. XVI. fig. 2.) 
Smaller and more cylindrical, pale reddish-brown, the aperture more protracted (34 millim.) and comparatively 
smaller. Length 42 millim.; diameter of the penultimate whorl 8, largest diameter (third whorl before 
the last) 83 millim. ; preserved whorls 15; aperture 6 millim. long, 54 broad. 
Hab. Mexico: one specimen in Pitel’s collection. 
7. Celocentrum tomacella. 
Cylindrella tomacella *, Morelet, Test. Noviss. i. p. 10 (1849)'; Pfr. Monogr. Helic. Vivent. iii. 
p. 568°; Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Cylindrella, p. 36, t. 4. figg. 19, 
20°; Sowerby, in Reeve’s Conch. Icon. xx., Cylindrella, t. 14. fig. 124+. 
Cylindrella moreleti (non Pfr.), Deshayes, in Férussac’s Hist. Nat. Moll. Terr. ii. p. 227, t. 164. 
figg. 16-18°. 
Celocentrum tomacella, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 342, t. 15. fig. 11°; 
Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 58, t. 6. fig. 3”. 
Hab. S.E. Mexico: woods of Tabasco, and in the ruins of Palenque, State of Chiapas 
(Morelet 1). 
tN. GuatemaLa: Coban (Sarg7). 
Obs.— Cylindrella attenuata, Pfr. Malak. Blatt. iii. p. 258 (1857); Martini & 
Chemnitz, Syst. Conch.-Cab. ed. 2, Cylindrella, p. 37, t. 9. figg. 1, 2; Monogr. Helic. 
Vivent. iv. p. 698; Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 404, found in 
Chiapas by Ghiesbreght, and known from one specimen only, looks very like a non- 
decollate specimen of Calocentrum tomacella. 
8. Coelocentrum arctispira. 
Cylindrella arctispira, Pfr. P.Z.S. 1860, p. 189, t. 50. fig. 2°; Malak. Blatt. vil. p. 59°”; Monogr. 
Helic. Vivent. vi. p. 877°; Sowerby, in Reeve’s Conch. Icon. xx., Cylindrella, t. 14. 
fig. 123%. 
Celocentrum arctispirum, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 348, t. 15. figg. 15, 
15 a°; Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 58, t. 6. figg. 4 (two figures), 
t. 11. figg. 9 (radula), 15 (jaw), t. 18. fig. 6 (anatomy), t. 14. fig. 3 (columellar axis) °. 
Cylindrella acutispira (misprint), Patel, Catalog der Conch.-Samml. ed. 2, p. 245 (1889) 7 
Hab. E. Mexico: Quilate, Agua Caliente, and Arroyo del Banco, all in the environs of 
Misantla (Dota Estefania"). 
S.E. Mexico: Istapa, in the State of Tabasco (SaJ/é°). 
S.W. Mexico: Juquila, in the State of Oaxaca (Boucard \~* °). 
* « Tomaculum,” a sort of sausage (Juvenal, Satyr. x. v. 355). 
