40 MOLLUSCA. 
VI. Depresse. 
26. Helicina borealis, sp.n. (Tab. I. fig. 15.) 
Testa depressa, subleevis, striatula, alba, superne maculis griseis biseriatis plus minusve obsoletis picta; spira 
breviter conoidea, apice prominulo ; anfr. 5, ultimus rotundatus, infra paullo magis convexus ; apertura 
parva, valde semicircularis, peristomate incrassato, brevissime expanso, margine columellari brevi, sub- 
perpendiculari, in angulum prominulum terminata, callo crasso, cireumscripto. 
Diam. maj. 10-12, min. 83-9, alt. 7 millim.; apertura diam. 43-5, lat. 5-53 millim. 
Hab. N. CuntraL Mexico: Villa Lerdo in Durango, in an open country with patches 
of Mimose (Hége). 
Approaches in form H. guadelupensis, Sow. 
27. Helicina sanguinea. | 
Helicina sanguinea, Pfr. in P. Z. 8. 1848, p. 124°; Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, 
Helicina, no. 10, p. 17, t. 8. figg. 20, 21°; Pfr. Monogr. Pneum. Vivent. i. p. 345°; Gray, 
Cat. Phaneropn. p. 249°; Sow. Thes. Conch. ili. p. 292, t. 275. fige. 364, 865°; Reeve, 
Conch. Icon. xix., Helicina, t. 20. figg. 178°. 
Hab. Honpuras ®® (Dyson ® 4). 
28. Helicina dysoni. 
Helicina dysoni, Pfr. in P.Z. 8. 1848, p.121*; Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, 
Helcina, no, 63, p. 49, t. 3. figg. 36-39? ; Pfr. Monogr. Pneum. Vivent. i. p. 384°; Gray, 
Cat. Phaneropn. p. 278%. 
Hab. VENEZUELA : Cumana (Dyson 3), 
Var. a: minor. 
Helicina dysoni, vars. B-6, Pfr. Monogr. Pneum. Vivent. i. p- 884°; Martini & Chemnitz, Syst. 
Conch.-Cab. ed. 2, no. 63, p. 49, t. 8. figg. 27-32°; Sow. Thes. Conch. iii. p- 286, t. 271. 
figg. 218, 214”. 
Hab. Honpuras’ (Dyson). 
Var, b: subglobosa, 
Helicina bocourti, Crosse & Fischer, in Journ. de Conch, xvii. p. 251 (1869) * 
Hab. British Honpuras: Belize (Bocourt ®), 
Var. ¢, jansoni, v. Mart.: distincte angulosa (diam. maj. 5, alt. 4, apert. 2 millim.) (Tab. I. fig. 16.) 
Hab. Honpuras: Island of Bonacca, Bay of Honduras (Gauwmer). 
The type is stated to be from Cumana, Venezuela, by Dr. Pfeiffer 1 3, According to 
Mr. Bland the same species occurs also on the island of Trinidad, on the coast of 
Venezuela, and has been described by J. L. Guppy [Ann. & Mag. Nat. Hist. (3) xiv. 
