EUCALODIUM. 258 
visible part of each whorl to its diameter, is important; but these differences, although 
discernible to the experienced eye of a conchologist, cannot well be denoted by a single 
word or number in a comparative Table. As regards the number and definition of 
the species, I have followed mostly Pfeiffer, Crosse and Fischer, and last, but not 
least, Strebel; but I am not sure that all will hold good when better series of each are 
available for comparison. 
The species may be arranged in the following groups :-— 
I 
- Shell large, exceeding 70 millim. in height and 15 in breadth, cylindrically turrite, with 
moderately produced aperture; colour violet or brownish.—ghiesbreghti, blandianum, 
walpoleanum, insigne, decollatum. 
2. Shell somewhat smaller and often of a paler colour ; in other respects similar to the preceding. — 
compactum, mexicanum, grande, splendidum, decurtatum, densecosiatum. 
. Resupinata, n. Shell somewhat fusiform, narrowed below, last whorl descending considerably 
beyond the suture, and the plane of the aperture thus very oblique; colour yellowish or 
brown.—speciosum, edwardsianum, deshayesianum. EE. cereum forms the transition to the 
following. 
4, Last whorl less or scarcely produced beyond the suture. 
oo 
a, Colour of the shell dull brown; sculpture feeble.—moussonianum, neglectum, truncatum. 
6. Colour of the shell whitish; ridges nearly vertical.—recticosta. 
Or 
. Anisospira, Strebel.. Shell strongly ventricose in the middle, rapidly narrowed above and also 
remarkably narrowed towards the aperture; colour reddish or white.—strebeli, liebmanni, 
hyalinum. 
Strebel treats this last subdivision as a distinct genus, and places it nearer Cylindrella, 
sensu stricto, than to Hucalodium; but till the form of the jaw and radula of the 
species belonging to it is known, there can be no positive decision about it. In this 
matter I agree with Fischer and Crosse, who point out that the form of the aperture is 
more like that of typical Eucalodium than of Cylindrella cylindrus, Chemn., which, 
among the insular forms, approaches nearest H. liebmanni in general outline and 
colour. Moreover, L. strebeli is a connecting-link with the true Lucalodia. 
In this genus, and also in Celocentrum, Holospira, and Cylindrella, the diameter 
of the shell is measured from the penultimate whorl, 7. ¢. above the upper end 
of the aperture, as the production of the aperture gives to the last whorl a dis- 
proportionate extension in diameter. 
1. Eucalodium ghiesbreghti. a 
Cylindrella ghiesbreghti, Pfr. P. Z. S. 1856, p. 380, t. 36. fig. 1"; Malak. Blatt. 11. p. 216 (1856) ?; 
Monogr. Helic. Vivent. iv. p. 694°; and in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, 
Cylindrella, p. 33, t. 8. figg. 18, 19*; Tristram, P. Z. 8. 1861, p. 231 °; Sowerby in Reeve’s 
Conch. Icon. xx., Cylindrella, t. 1. fig. 7°. 
Eucalodium ghiesbreghti, Crosse & Fisch. Journ. de Conch. xvi. p. 88 (1868)", and xviii. p. 18, t. 5. 
figg. 1-4 (jaw and radula) (1870) *; Miss. Scient. Mex., Mollusca, i. p. 368, t. 14. fige. 4, 4a, 
and t. 16. figg. 14-21 (anatomy) °; Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 63, 
t. 5. fig. 20, t. 14. figg. 11 4, B”. 
