MOLLUSCA. 60t 
Chondropoma kisteri (p. 18). 
Cistula kiisteri, Fischer & Crosse, Miss. Scient. Mex., Moll. ii. p. 194, t. 42. figg. 7,7 a,b’. 
To the locality given, add:— 
N. Guatemata: San Miguel de Tucuru, Alta Vera Paz (Sarg*); Poctun, Vera Paz, 
(Sallé>); Guatemala, without nearer indication of locality (Morelet 5). 
Chondropoma largillierti (p. 19). 
Cistula largillierti, Fischer & Crosse, Miss. Scient. Mex., Moll. ii. p. 196, t. 42. figg. 10, 10a, 6°. 
Chondropoma (Cistula) largillierti, Pilsbry, Proc. Acad. Phil. 1891, p. 3817”. 
_ To the localities given, add :-— 
[Yucatan :] Carmen and Merida (Morelet®) ; Labna, Santa Ana near Calcehtok, Silam, 
Merida, Tekanto, Tunkas, Uxmal, Sitilpech, and Tabi (Heilprin 1). 
In the young, non-truncated shell of four whorls the first whorl is smooth and 
globose and the umbilicus is rather broad. 
Var. grateloupi. 
Cistula grateloupi, Fischer & Crosse, loc. cit. p. 198, t. 42. figg. 8, 8a, b, and 9”. 
Fischer and Crosse treat C. grateloupi and C. largillierti as specifically distinct, 
urging that in the former the sculpture is rather latticed by the comparatively stronger 
spiral ridges and that the sutural denticles are united into groups (* fasciculatim 
dilatatis’”). Pilsbry‘*, on the contrary, who had, like myself, a large number of 
specimens before him, agrees with me “that a separation of the more coarsely ribbed 
forms from the finely decussated examples is not practicable”; he states also that the 
colour varies from a clear yellowish-white, with numerous rows of brown spots, to dark 
red, and that also the shape of the shell is subject to great variation. 
Chondropoma vespertinum (p. 19). 
Chondropoma vespertinum, Fischer & Crosse, Miss. Scient. Mex., Moll. i. p. 211, t. 41. figg. 7,7 a‘. 
DIPLOMMATINA (p. 20). 
Ancey [Journ. de Conch. xlvii. pp. 194-197 (1899)] states that four species of 
American Diplommatine are now known: viz. our D. stolli; D. occidentalis, Guppy, 
from the Island of Trinidad; D. limensis, from Peru; and D. tuema, Doring, from 
Argentina. The two latter are placed by A. Doring [ Apuntes Faun. Moluse. Argentin. 
pt. 5 (1884)] in his new genus Adelopoma; he remarks that it is not very probable 
that all these have been accidentally introduced from India or Polynesia to the 
American continent. 
BIOL. CENTR.-AMER., Terr. and Fluviat. Mollusca, December 1900. "6 
