164 
MOLLUSCA. 
Gen. Segmentina, Flem., subgen. Planorbula, Hald., type armigera, Say, 
and Segmentina proper, 
? Subfam, Oamptocerinaj. 
Gen. CamptoccraSf Buns. 
Subfam. PoMPiiOLiGiNiE. 
Gen. Pompholgx^ Lea. 
Gen. ? Choanomphalus, Gerstf. Animal unknown. 
Gen. CarinifeXf Binn. 
The Ancylidcef including also Gundlachia and ? Latia, the Physidce^ and 
the Chilinidce elevated to the rank of distinct families. 
Chilina ovalis, Sow. Lingual dentition described and figured by Ball, 
Ann. Lyc. N. York, ix. p. 347. 
Pseudochilma, n. g. Shell thin, covered with a rough fibrous epidermis, 
spire elevated, acute. — Ps. Immceformis, sp. n., Chili. The broad plicate 
columella distinguishes it from Limncea. Ball, /. c. p. 367. 
Limncea, group Gulnaria, Leach, ox Radix, Montf. The European 
species of this group have been carefully revised by Dr. W. Kobelt. 
He remarks that none of the species or true varieties are rare in 
their localities, and that every so-called species wliich is said to 
occur in but few specimens is to be suspected ; similar conditions 
may give similar features to different spc(dos, and so cause cur- 
respondiny varieties of distinct species, which live in the same 
locality. Among the more striking of such cases are the lacus- 
trine varieties, living in large inland lakes, and distinguished by 
a more solid shell and shortened spire from the types of their 
species. The author gives the following species and varieties : — 
1. auricularia, Brap., type pi. 1. fig. 1, var. costellata fig. 2, var. ampla, 
flartm., fig. 3 ; monardii, Hartm., pi. 2, fig. 4, is rather au individual form (as 
also var. eollisa, Moq.-Tand,, and gibhosa), var. minor fig. 6, var. obtusa 
fig. 6, var. tumida, Held, fig. 7, var. ventricosa, Ilartm., pi. 3. fig. 8. 
2. mdgaris (Rossm., not 0. VL)=.acutalis, Morelet, acuta, Jeffr., biformis, 
Krister [and lagotis, Schranck, the oldest name], type pi. 3. fig. 9, var. 
alata fig. 10. 
3. ovata, Brap., typical form pi. 3. fig. 11, var. injiata pi. 4. fig. 12, var. 
ampullacea, Rossm., fig. 13, var. dickinii fig. 16. Mai. Bl. xvii, pp. 145-1()G, 
with 4 plates. 
Limncea, sp., between stagnalis and auricularia, probably stagn. var. laeustris, 
from the Walchensee, Bavaria. Walser, Nachrichtsbl. mal. Ges. ii. p. 94. 
Limntxa rosea, v. Gallenstein, is to be regarded as a lacustrine variety of 
vulgaris, Rossm. Kobelt, Nachrichtsbl. mal. Gesellsch. ii. p. 127, after- 
wards given as a variety to L. peregra. Mal. Bl. xvii. p. 180. 
Limncea glabra, Miill. [elongata, Brap.], very small, only 6 millims. long. 
V. d. Broeck, Ann. mal. Belg, iv. (18G9) p. 86, pi. 2. fig. 1. — L. elongata, 
Brap., and palustris, Miill., var. from Hamburg described by II. Strebol, 
Nachr. malak. Ges. ii. p. 124. — L. fusca, 0. Pfr., var. gracilis, Pirona, from 
Friuli by E. de Betta, Malac. Veneta, p. 124. 
Limncea martoreUi, sp. n., Bourguignat, R. Z. 1870, p. 167, Estanque de Bag- 
nolas in Catalonia. 
