36 MOLLUSCA. 
16. Helicina succincta, sp. n. (Tab. I. figg. 6; 9, var.) 
Testa globoso-conoidea, leviter spiratim sulcata, albida vel pallide rufescens, fusco-variegata; anfr. 5, con- 
vexiusculi, sutura impressa, ultimus prope aperturam basi planulatus, angulo valde obtuso prope aperturam 
evanescente cinctus; apertura diagonalis, triangulari-rotundata, peristomate incrassato, breviter expanso, 
albo, margine columellari subperpendiculari, in tuberculum subrectangulum terminato, callo crasso, parvo, 
circumscripto. 
Diam. maj. 9-10, min. 73-9, alt. 84-10 millim. ; apert. diam. 4-43, alt. obliqua 5-6 millim. (fig. 6). 
Hab. E. Mexico: Cordova (Sallé, Hége) (fig. 6). 
Var. minor, diam. 8, alt. 63 millim., rufescens, fusco-strigata (fig. 9). 
Hab. EF. Mexico: Cuesta de Misantla (Mateo Trujillo) (fig. 9); Tlacolula, between 
Las Vigas and Misantla (Hége). 
Rather near H. arenicola, especially as regards the form of the peristome and colu- 
mella ; but of larger size, with more elevated spire, remarkably coarser spiral structure, 
and more reddish coloration. As the localities are also well separated, and I have 
seen no intermediate forms, I feel obliged to keep them distinct; it is possible, how- 
ever, that when additional examples are obtained they may prove to run one into 
the other. 
17. Helicina raresulcata. 
Helicina raresulcata, Pfr. in Malak. Blatt. viii. p. 173 (1861); Monogr. Pneum. Vivent. iii. p. 228°, 
& iv. p. 269°; Strebel, Abhandl. Geb. Naturw. Ver. Hamb. vi. 1, p. 19, t. la. fig. 9, & t. 2. 
fige. 9, 9a’. | 
Hab. E. Mexico: Vera Cruz (Berendt!*); Vera Cruz, on the plain inland of the sand- 
hills, on the leaves and stalks of a stinging shrub called “ mala muger ” (Strebel *). 
18. Helicina arenicola. 
Helicina arenicola, Morelet, Test. Noviss. i. p. 211; Pfr. in Martini & Chemnitz, Syst. Conch,-Cab. 
ed. 2, Helicina, no. 99, p. 78, t. 10. figg. 24-277; Monogr. Pneum. Vivent. i. p. 366°; 
Gray, Cat. Phaneropn. p. 265*; Sow. Thes. Conch. iii. p. 286, t. 271. fig. 303°; Reeve, 
Conch. Icon. xix., Helicina, t. 28. fig. 250°. 
Hab. N. Yucatan : Sisal, in sandy localities * 4 (Morelet 1). 
The habitat “Cuba” quoted by Sowerby® and Reeve® is erroneous; Morelet 
described in the same pamphlet! several Cuban species, but to this he expressly 
attributes the locality given above. 
19. Helicina punctisulcata, sp. n. (Tab. I. fig. 10.) 
Testa conoidea, subangulata, sulcis tenuibus subdistantibus punctiferis sculpta, nitidula, rufescens, interdum 
fusco-fasciata, subtus pallidior ; spira conica, rufa; apertura diagonalis, triangulari-semicircularis, peri- 
stomate incrassato, leviter expanso, albo, margine columellari brevi, subperpendiculari, basi subangulato, 
callo parvo, flavo. 
Diam. maj. 9, min. 73, alt. 7} millim.; apert. diam. 44, alt. obliqua 4 millim. 
