MOLLUSCA. 621 
PATULA (p. 126). 
Pilsbry, in Tryon’s ‘Manual of Conchology,’ (2) ix. p. 42, substitutes the name 
Pyramidula, Fitzinger (1833), for Patula, Held (1837). Fitzinger, led chiefly by the 
external form, proposed Pyramidula for the pyramidal Helix rupestris, Discus for. the 
flat, blunt-angulated H. rotundata, and Gonyodiscus for the flat, sharply-keeled 
H. perspectiva, Meg.=solaria, Menke, and he placed the two latter far distant from the 
first. Held recognized the natural affinity of all three and named the whole Patula. 
Pyramidula has precedence only for a subdivision, including H. rupestris, but excluding 
H. rotundata and H. solaria, and to use it in the extended sense of Patula is really 
not a rehabilitation, but a mere innovation. 
Pilsbry (Joc. cit. p. 54) also unites the species enumerated by me under the sub- 
genus Thysanophora, of Patula(anted, pp. 128, 129), with those referred to the subgen. 
Acanthinula, of Helix (anted, pp. 130-132), under the one genus, Thysanophora, and 
includes in it Microphysa, Albers; he says that they are widely separated from 
Pyramidula (Patula) by the absence of a parapodial groove, but it has not been ascer- 
tained as yet that this is the case in Mexican and Central-American forms. He places 
Thysanophora in his tribe “‘ Teleophallogona” of the Helicide. 
1 (a). Patula strigosa. 
Heliz strigosa, A. Gould, Proc. Bost. Soc. Nat. Hist. 1846, p. 18'; U.S. Expl. Exped., Mollusca, 
p- 36, t. 3. figg. 41, 41a, 6°; Pfr. Monogr. Helic. Vivent. i. p. 121°; Binney, Terr. Moll. 
N. Am. iv. p. 28, and v. t. 26a@*; Land and Freshw. Shells N. Am. i. p. 72, fig. 121°. 
Patula strigosa, Binney, Manual Am. Land Shells, p. 165, fig. 151°; Dall, Proc. U.S. Nat, Mus. 
Kix. p. 335", 
A large species of about 25 millim. in diameter and 13 in height, variable in coloration, usually with several 
narrow dark spiral bands. 
Hab. N.W. Mexico: San José Mountain, Sonora (Dr. Mearns"). 
Extends northward from New Mexico, on the Rio Pedro, to the British possessions 
in N.W. America, and eastward of the Rocky Mountains at least as far as 
long. 108°, and also occurs in Eastern Oregon *~*. 
According to Binney ° it is viviparous. 
Patula wilhelmi (p. 128). 
Patula wilhelmi, Biolley, Mol. terr. y fluv. de Costa Rica, p. 10 . 
Patula (Thysanophora) conspurcatella (p. 128). 
Thysanophora conspurcatella, Pilsbry, Nautilus, xiii, p. 189 (1900) ’. 
To the localities given, add :— 
Hab. S.E. Mexico: San Juan Bautista (Rovirosa’). 
