NEW SNAILS—PARODIZ 449 
Genus Peronaeus Albers, 1850 
Subgenus Lissoacme Pilsbry, 1896 
TIissoacme is included as a subgenus of Peroneaus and the original 
Pilsbry’s combination Bulimulus (Bostryz-Lissoacme) is separated for 
reasons given in my previous paper ‘‘Los géneros de los Bulimulinae 
argentinos” (Rev. Mus. La Plata, new series, Zool., vol. 4, p. 338, 
1946). 
Peronaeus (Lissoacme) tyleri (Dall) 
Bulimulus tyleri Dall, Smithsonian Mise. Coll., vol. 59, no. 14, p. 6, 1912 (new 
name for B. simplex Hupe, 1857, not Jonas 1842). 
Type locality: Santa Ana, in the Urubamba River valley, Peru. 
The protoconch of the two ‘‘cotype” specimens (USNM 250261) 
is not angulated and striated as it is in Bulimulus, but is completely 
smooth, and all the characters are as in Peronaeus (Lissoacme). 
Peronaeus (Lissoacme) borellii (Ancey) 
Bulimulus borellit Ancey, Bull. Mus. Zool. Torino, vol. 12, no. 309, p. 13, 1895: 
Bulimulus (Drymaeus) chacoensis Preston, Ann. Mag. Nat. Hist., ser. 7, vol. 20) 
p. 491, 1907 (not B. chacoensis Ancey 1897—Protoglyptus). 
Peronaeus (L.) borellii, Parodiz, Nautilus, vol. 71, p. 23, 1957. 
Type locality: Misién San Francisco, Bolivia. 
This species belongs to the group of torallyz d’Orbigny composed 
of species belonging to Peronaeus (Lissoacme), not Drymaeus as 
supposed by earlier authors. The type specimen of chacoensis 
Preston (USNM 202509) is perfectly identifiable with borelliz. 
Peronaeus (Lissoacme) torallyi nigroumbilicatus (Preston) 
Bulimulus (Drymaeus) nigroumbilicatus Preston, Ann. Mag. Nat. Hist., ser. 7, 
vol. 20, p. 491, 1907. 
Peronaeus (Lissoacme) torallyi nigroumbilicatus Parodiz, Comun. Zool. Mus. 
Montevideo, vol. 2, no. 38, p. 20, 1947. 
Type locality: North of Pilcomayo River, Chaco region, Bolivia. 
This is the form of torallyi, with black umbilicus and apex, referred 
to by d’Orbigny (1837); the apex is often black in the typical form 
of the species, but the dark umbilical area is characteristic of this 
subspecies. In 1947 I described this form as new under the same 
name nigroumbilicatus; thus the name becomes a synonym and 
homonym of Preston’s name, but the generic and specific combination 
remains as I stated. The specimens J used as types on that occasion 
came from Embarcacién, Salta, Argentina (MACN 8848), collected 
by J. Steimbach, 1916. Other specimens are from the Bolivia- 
Argentina border, near the Pilecomayo River, (MACN 1311), collected 
by E. A. Holmberg, Jr., 1908, Yacuiba, Bolivia, near Argentine border 
(MACN 11008), collected by J. Steimbach, 1920. 
