270 MOLLUSCA. 
4. Celocentrum anomalum. 
Celocentrum anomalum, Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 59, t. 6. fig. 8, and 
t. 14. fig. 5 (1880). 
Hab. N. Guatemata: Coban (Sarg '). 
Differs from all others of the genus in its violet-chocolate colour; base of the last 
whorl dirty flesh-coloured. Aperture very oblique and comparatively small. In other 
respects not unlike C. clathratum. 
5. Celocentrum turris. 
Cylindrella turris, Pfr. P. Z.S. 1856, p. 880, t. 86. fig. 2’; Malak. Blatt. i. p. 217 (1858) °; 
Monogr. Helic. Vivent. iv. p. 695°; in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, 
Cylindrella, p. 85, t. 8. figg. 20, 21*; Bland, Ann. Lyc. New York, viii. p. 160 (1865) °; 
Sowerby, in Reeve’s Conch. Icon. xx., Cylindrella, t. 18. fig. 117°. 
Eucalodium turris, Crosse & Fisch. Journ. de Conch. xvi. p. 88", and xviii. p. 22°. 
Celocentrum turris, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 345, t. 15. figg. 18, 18 a, ¢, 
13 6 (columellar axis)°; Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 56, t. 5. 
fig. 18, and t. 14. figg. 2 a, B (columellar axis) ”. 
Hab. S.E. Mexico: Chiapas (Ghiesbreght 1-4 § 9), 
Varies in the length of the adult shell from 59-72 millim., and in the breadth of 
the penultimate whorl from 123-14 millim. Number of preserved whorls 16-24. 
The variation in the length of the adult shell does not depend entirely upon the 
number of preserved whorls: I have before me a specimen measuring 61 millim. 
with 16 preserved whorls, and another of 60 millim. with 19 preserved whorls. The 
greater the number of preserved whorls, the more strongly is the shell attenuated 
upwards. 
The figure in Reeve’s ‘ Conchologia Iconica,’ 77 millim. long, represents a specimen 
with an unusually large number of preserved whorls, viz. 27. 
6. Celocentrum clava. 
Cylindrella clava, Pfr. P. Z. 8. 1856, p. 380, t. 36. fig. 3'; Malak. Blatt. iii. p. 217 (1856) °; in 
Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Cylindrella, p. 36, t. 8. figg. 11, 12°; 
Monogr. Helic. Vivent. iv. p. 696°; Bland, Ann. Lyc. New York, viii. p. 160 (1865) °; 
Sowerby, in Reeve’s Conch. Icon. xx., Cylindrella, t. 18. figg. 115 a, b°. 
Eucalodium clava, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 346, t. 15. fig. 147; Strebel, 
Beitr. Mex. Land- und Siissw.-Conch. iv. p. 57, t. 5. fig. 10, and t. 14. fig. 8 (columellar 
axis) °, 
Hab. 8.K. Mexico: Chiapas (Ghiesbreght 14 7 8), 
Very near C. turris, but smaller, varying in the total length from 40-57 millim., 
and in the breadth of the penultimate whorl from 9-10 millim. Number of preserved 
