156 
MOLLUSCA. 
meeting in the middle at acute angles) . Several Mexican and 
S.-American spp., also those now comprised in the groups Or- 
thalicus and Placostylus, together forming, with the genus 
Lignus, the family Orthalicidca. All American except Plaeo- 
stylus. 
4. Bulimus with compound maxilla, as yet too little known to 
be classified. 
[This arrangement coincides essentially with that proposed, from the ori- 
ginal researches of Troschel, hy the Recorder in Albers’s Heliceen,” ed. 2, 
and followed hitherto in Zool. Rec., with the additions and connections which 
since that publication have resulted from the researches of various observers. 
/The second division is not wholly confined to the Old World, but occurs also 
in North and Central America.] 
Bulimus ohlongus, Miill., var. alba, pardalis (F<^r.),aud marmoratus (Danker); 
for jaw and lingual dentition, cf. Bland & Binney, 1. c. pp. 180 & 181. 
Bulimus heeriamis, teysmanni, pur us, appressus, and andamensis (Moussou) 
are figured in Pfeiffer’s Nov. Conch, iv. pp. 31-35, pi. 116. figs. 1, 2 & 3, 6, 
4 & 5, and 7-10. The fir.st two are said to be from the Moluccas, and seem 
scarcely distinct from ivinteri (Pfr.) j the two following are from Java j and 
the last, from the. Andaman I., seems scarcely distinct from invei'sus (Miill.). 
Placustylus. Bulimus porphyrostomus (Pfr.) and scarabus 
(Albers) have been anatomically investigated by TTscher (/. c. 
pp. 161-166, pi. 7). Their jaw is much arched, with oblique 
ribs, meeting in the centre under an acute angle, as in the Gonio-^ 
gnatha ; the teeth of the radula are similar to those of true 
Bulimus and Helix ; the sagitta, multifid vesicles, and flagellum 
are absent j the genital apparatus is limited to the most essential 
organs. 
The large New-Caledonian spp. are thus arranged by Gassies, Act. Soc. L. 
Bold, xxviii. pp. 56-92 : — 
1. Placostylus (Beck). 
a. B, fihratus (Mart.), huccalis and pinicola (Gass,), boutariensis (Souv.), 
insignis (Pet.), ouveanus (Dotz.), edwardsianus and infundibulum (Gass.), du- 
plex, sp. n. p. 64, similis, ouensis, and lamberti (Gass.). 
b. B. souvillii (Morelet), cicatricosus, new name for the var. kanalensis 
(Crosse) of souvillii, alexander (Crosse), guestieri (Gass.), and goroensis (Souv.). 
c. B. porphyrostomus (Pfr.), culedanicus (Pet.), mariei (Crosse), submar id 
(Souv.), pseudocaledonicus (Moiitr.), scarabus (Alb.), annibal (Souv.), bun- 
deensis (Cr. & Souv.), bivaricosus (Gask.), cesopeus and infundibulum, spp. mi., 
pp. 86 & 87. 
2. Charis (Albers). 
d. B. eddystonensis (Reeve), bavayi (Crosse), rhizophorarum, correction for 
jialetuvianus (Gass.), pancheri (Crosse). 
Btdimus debeauxi, lalannei,imbricatus, turgididus, alborosetcs, supetfasciatus, 
patens^ falcicula, ?ieoouensis, carbotxarius, ahbreviutus, and bulbulus, spp. nn., 
id. ibid. pp. 184-193, all from New Caledonia. 
Placostylus. Mario discusses the general and specific characters, poly- 
