MOLLUSCA. | 599 
ih Sg apn to a different species, and that its locality ‘‘ Chiapas” is doubtful. 
a ie » the figure of it given by Reeve ® represents a shell of larger size and with flatter 
whorls than the one shown by Pfeiffer 2, which must be regarded as typical. 
Choanopoma sumichrasti (p. 18). 
Choanopoma sumichrasti, Fischer & Crosse, Miss. Scient. Mex., Moll. ii. p. 184, t. 41. figg. 9,9a°. 
In ° . . . * 
this species the spiral bands are continuous, not interrupted, a character rarely 
seen in this genus. 
Choanopoma, osberti (p. 16). 
Adamsiella osberti, Fischer & Crosse, Miss. Scient. Mex., Moll. ii. p. 178°. 
Chondropoma andrewsz (p. 16). 
Colobostylus andrewse, Crosse & Fischer, Journ. de Conch. xxxvi. p. 233 (1888) ”; Simpson, Nautilus, 
x1. p. 13 (1897) °. 
To the locality given, add: 
[Honpvras :] Island of Utila, in a grove of the prickly thatch-palm (Thrinax radiatus), 
on the ground (Simpson ®). 
This species does not really belong to Chondropoma, as it agrees in the structure of 
the testaceous operculum (previously unknown to me) with the West-Indian forms, 
which were left by Dr. Pfeiffer in his genus Cyclostomus. 'These latter were separated 
into a distinct group [Malak. Blatt. xi. p. 134 (1864)], which was subsequently named 
Colobostylus by Crosse and Fischer ?. 
Chondropoma subangulatum (p. 17). 
Cistula subangulata, Fischer & Crosse, Miss. Scient. Mex., Moll. ii. p. 200°. 
Chondropoma rubicundum (p. 17). 
Chondropoma rubicundum, Fischer & Crosse, Miss. Scient. Mex., Moll. ii. p. 205°; Puilsbry, Proc. 
Acad. Phil. 1892, p. 338°. 
To the localities given, add :-— 
Hab. S.E. Mexico: Mountains of Poana, Tabasco (Rovirosa °). 
[N. Guatemata:] Cahabon (Sarg *). 
Fischer and Crosse ® distinguish several varieties in size and in the more or less 
bright colour of the aperture ; their largest specimen is 14 millim. in length and 8 in 
diameter, their most inflated one 12 millim. in length and 85 in diameter. 
Chondropoma cordovanum (p. 17). 
Chondropoma cordovanum, Fischer & Crosse, Miss. Scient. Mex., Moll. ii. p. 207’. 
These authors give the length of a truncate specimen as 94 millim., with a diameter 
