MOLLUSCA. 607 
Helicina dysoni (p. 40). : 
Helicina dysoni, Ancey, Ann. de Malac, ii. p. 255 (1886) ° ; Simpson, Nautilus, xi. p. 13 (1897) °. 
To the localities given, add:— 
Hab. [Honpuras:] Island of Utila, in a grove of the prickly thatch-palm (Thrinar 
radiatus), living ones on the underside of its leaves, dead shells on the ground 
(Simpson ® 6), 
Var. bocourti (p. 40). 
Helicina dysoni, var. bocourti, Fischer & Crosse, Miss. Scient. Mex., Moll. ii. p. 437, t. 56. figg. 10, 
10. a, 6°. : 
Helicina lirata (p. 41). 
Helicina lirata, Pilsbry, Proc. Acad. Phil. 1891, p. 8332”; Nautilus, xiii. p. 189”; Fisch. & Crosse, 
Miss. Scient. Mex., Moll. ii. p. 398 *. 
To the localities given, add :— 
Hab. [S.E. Mexico:] San Juan Bautista (Hége); garden of the Juarez Institute, in 
the same town (fovirosa °°). 
[Yucatan :] Labna (Heilprin 2). 
[N. Guatemata:] Panzos (Conradt). 
S.W. Costa Rica: Alto de Mano Tigre, 690 metres (Pittier). 
Var. rusticella (p. 41). 
To the localities given, add :— 
Hab. 8.W. Costa Rica: El Pozo, in the shingle (gravices) of the Rio Grande de Terraba 
(Pittier). | 
Var. unidentata (p. 41). 
Helicina lirata, var. unidentata, Ancey, Ann. de Malac. ii. p. 264 (1886) '°*, 
To the locality given, add :— 
Hab. [Honpuras:] Utila Island (Szmpson "*). 
TROCHATELLA (to follow the genus Helicina, p. 42). 
Trochatella, Swainson, Treatise of Malacology, p. 337 (1840) ; Pfeiffer, Monogr. Pneum. Vivent. 
i. p. 328. 
This genus is nearly allied to Helicina, from which it may be known by the absence 
of the callosity covering the middle part of the lower face of the shell. It has hitherto 
been limited to the West Indies, and its occurrence in Utila affords another instance of 
the prevalence of Antillean types in this island: cf. Cylindrella, supra, p. 286. 
1. Trochatella simpsoni, | 
Trochatella simpsoni, Ancey, Ann. de Malac. ii. p. 253 (1886) °. 
Shell conical, of a straw-yellow colour, not shining. 
Diam. 24, alt. 24, apert. 17 millim. 
Hab. Honpvras: Utila Island (Simpson '). 
