18 Moll 
MOLLUSC A. 
Shells of Succinea obliqua and avara, Helicina occulta^ Pupa fallax^ 
and Helix striatella found in a yellow loam or clay,, which in all 
respects corresponds very closely with the “loss” of the valley of the 
Rhine, near Davenport, Iowa ; W. H. Pratt, P. Davenport Ac. i. 
p. 97. 
Tertiary Tasmanian shells ; P. R. Soc. Tasm. 1876, pp. 21-42. 
Panopcea glycimeris (Born.) = aldrovandi (Menard de la Groie) 
found in sub-fossil state in Southern France ; E. Dumas, R^v. Montp. 
iv. (Sept. 1875), and J. de Conch, xxiv. pp. 135, 136 & 189. 
Shells found in ancient mounds in Illinois and Iowa, including Unio, 
Cassis madagascariensis [P], Pirula perversa^ and Dolium\ Pratt, P. 
Davenp. Ac. i. pp. 42, 105, 112, 113, 119 & 136. 
Acclimatization, ^c. 
G. B. Adami has tried to introduce 17 species of land- and freshwater- 
Mollusks at Edolo, Val Camonica, from other parts of Upper Italy ; 4 
of these soon disappeared, the rest survived ; Moll. terr. e fluv. di Brescia 
e Bergamo, p. 91. Acclimatization of Helix nemoralis, at Burlington, 
New Jersey, 1857-1865, succeeded, that of lapicida failed; Weinland, 
Weichthierf. d. schw. Alb, p. 59. 
C. MOller has given some notes concerning, the immigration of 
Dreyssena polymorpTia (Pall.) in Bavaria. Abh. Ver. Regensb. xxviii. 
1874. 
Madeira. Land-shells of recent introduction, see anted^ p. 13. 
Balea perversa (L.) passes the winter in clefts of the bark of trees, and 
revives with a thaw, as early as J anuary ; a similar revival has also been 
observed in Cionella lubrica (Miilh.) which passes the winter on 
the ground. Pack, Schr. Ver. Schlesw. Holst, i. (1875) pp. 277 & 278. 
The same habits obseryed in Helix fruticum ; Weinland, Weichthierf. d. 
schw. Alb, p. 55. 
Potamides layardi (H. Ad.) living in salt lakes of the great Indian 
desert ; Blanford, J. A. S. B. (n. s.) xlv. pt. 2, p. 94. 
Species of Planorbis and Physa found [alive ?] in a salt marsh. 
Northern Kansas ; Parry, P. Davenport Ac. i. p. 39. 
General Classification. 
H. V. Ihering (JB. mal. Ges. ii. pp. 97-148) gives a preliminary ac- 
count of an extensive work on the nervous system and the “ phytogeny ” 
of the Mollusca. Rejecting generally the systems founded on a single 
character, as, for example, the separation of the sexes, and the respira- 
tory organs by Cuvier, and the radula by Troschel, he establishes a new 
system based on the arrangement of the nervous system, in the follow- 
ing manner : — 
Vermes. Phylum Amphineura. Four longitudinal trunks of nerves, 
the two ventral connected by several transverse commissures. In- 
