MOLLUSCA. 637 
CYLINDRELLA (p. 286). 
Cylindrella bourguignatiana, (p. 286). 
Cylindrella bourguignatiana, Pilsbry, Proc. Acad. Phil. 1891, p. 3167; Simpson, Nautilus, xi. 
p- 13 (1897) °. ; 
Pilsbry thinks that this species is allied to C. spelunce, C. morini, and C. subtilis 
(which are here referred to the subgenus Epirobia of Holospira), although the shell 
is always truncated, and has the base compressed into an acute carina. 
Simpson? states that his specimens were found in a prickly thatch-palm grove 
(Thrinax radiatus) on Utila Island, the types described by Ancey! having been found 
- by him. 
MACROCERAMUS (p. 287). 
Macroceramus concisus (p. 287). 
Macroceramus concisus, Pilsbry, Proc. Acad. Phil. 1891, p- 316”. 
To the localities given, add :— 
Hab. | Yucatan :] Izamal, Merida, Tekanto, Tunkas, between Tunkas and Sitilpech, 
Ticul, Uxmal, and Santa Ana, near Calcehtok, very abundant (Heilprin it), 
CreytraL Costa Rica: Santa Clara, 2000 metres (Biolley, 1895). 
Var. arctispirus. ° 
Macroceramus gossei, var. arctispirus, Ancey, Ann. de Malac, ii. p. 242 (1886) *; Pilsbry, loc. cit. 
p- 316”. 
Hab. Yucatan: Merida, Tekanto, Tunkas, &c. (Heilprin }8). 
Honpvuras: Utila Island (Simpson !* 18). 
- This is, according to Pilsbry %, a small form of M. concisus, exactly corresponding 
with the smaller specimens which occur with the typical ones in Yucatan. 
Macroceramus kieneri (p. 289). 
Macroceramus kieneri, Binney, Bull. Mus. Comp. Zool. xix. p. 202 (with figure) (1890) *. 
: OPEAS (p. 291). 
Opeas subula (p. 291). 
To the localities given, add :— 
Hab. E. Costa Rica: Moin Hill, near Limon (Pittier). 
Opeas micra, var. caracasense (p. 294). 
Rumina (Opeas) caracasensis, Pilsbry, Proc. Acad. Phil. 1891, p. 318 a 
To the localities given, add :— 
Hab. [S.W. Mexico:] San Carlos, east of Oaxaca ( Hoge). 
E. Costa Rica: Moin Hill, near Limon, and Bruschik, Alta Tararia, near Talamanca 
(Pittier). 
Pilsbry 18 also records it from Orizaba and Vera Cruz (Heilprin }8). 
