78 Moll. 
MOLLUSCA. 
Helix gadensis, hischoffensis, and anti-alba, spp. nn., Beddome [in P. R. 
Soc. Tasra., April, 1879, not published until 1880] ; Petterd, 1. c. pp. 29, 
39, 41, Tasmania. 
Helix hookeriana [pre-occupied as H. hookeri, by Reeve], sp. n., R. M. 
Johnston, P. R. Soc. Tasm., April, 1879 [1880] ; Petterd, 1. c. p. 38. 
Helix. Polynesian species : — 
Patula rurutuensis, sp. n., Garrett, P. Ac. Philad. 1879, p. 18, Rurutu. 
Pitgs degagii, sp. n., id. ibid., Rurutu. 
Helix. Species from North America, including Mexico : — 
Microphysa stearnsi (Bland, ^sZonites), jaw ribbed, radula with aculeate 
marginal teeth ; Binney, Bull. Mus. C. Z. v. p. 336, pi. i. figs, m & n. 
Microconus, subg. n. ; shell turbinate, widely umbilicated, whorls 
rounded, irregularly plaited, brown coloured ; aperture simple ; for M. 
wilhelmi (Pfr., as Helix). Strebel & Pfeffer, Mexik. Land Conch, iv. 
p. 29, pi. iv. fig. 7, shell only. [Scarcely distinct from Microphysa, 
Albers.] 
Patula hermanni and mazatlanica (Pfr.), Mexico, iid. ibid, the first 
pi. iv. fig. 8. 
Thysanophora, subg. n. ; shell flat or conical, widely umbilicated, brown, 
with longitudinal plaits and rows of epidermic fringes ; aperture simple. 
T. impura (Pfr.) and paleosa, sp. n., Mexico, lid. 1. c. p. 30, pi. iv. 
figs. 2 & 3, shell only. Helix conspurcatella and turbinella (Morelet), and 
almonteana (Tristram) are also referred to this subgenus. 
Trichodiscus, subg. n. [name preoccupied in Protozoa'] ; shell sub- 
depressed, widely umbilicated, banded, beset with fine bristle-bearing 
warts; peristome shortly reflected. T. cordovanus (Pfr.), Mexico, 
anatomically described, jaw ribbed. lid. 1. c. pp. 32-35, pi. iii. fig. 5, 
pi. xi. figs. 1, 10, & 17. Helix coactiliata (F4r.), pressida (Morelet), and 
oajacensis (Koch) are also referred to this subgenus. 
Acanthinula granum, sp. n., iid. 1. c. p. 31, pi. ix. fig. 13, Mexico. 
Strobila labyrintkica (Say), Mexican varieties and anatomical descrip- 
tion ; iid. 1. c. pp. 43-45, pi. iv. fig. 6, pi. xv. fig. 7 ; radula, pi. xi. fig. 2. 
Polygyra implicata (Beck), plagioglossa (Beck), helictomphala (Pfr.), 
couloni (Shuttl.), texasiana [^texana] (Morelet), oppilata (Morelet), and 
ariadnce (Pfr.), Mexico, shells, and the first also anatomically described ; 
iid. 1. c. pp. 45-50; shells, pi. iii. figs. 1-4, pi. xv. figs. 11-13; radula, 
pi. x. fig. 2. 
Triodopsis vultuosa (Gould), radula ; Binney, Bull. Mus. C. Z. v. p. 335, 
pi. ii. fig. c. 
Mesodon sayi (Binn.), var. chilhoweensis and M. devia (Gould), genital 
system ; id. 1. c. p. 336, pi. ii. figs, g & /; radula of the former, pi. i. 
fig. k. 
Helix chilhoweensis (Lewis), specifically distinct from diodonta (Say), 
Highlands of Kentucky and Tennessee ; Weatherby, Am. Nat. xii. [1878] 
pp. 390-392. 
[Mesodon] Helix [Patera) ingallsiana (Shuttl.), figured in Shuttlewprth, 
Notitioe Malacol. ii. pi. iii. fig. 
