UNlONIDiE, MYT1LID.E. 
in 
U, marginalis (Lam.), lamellntus (Rv.), and corrugatm (Mull.). Critical 
remarks on their numerous varieties, by Hanley & Theobald, Conch. Ind. 
pp. 5, 20, 21, pis. 9, 42, 43, 44, & 45. U. smaragdites (Bens.), iid. ibid. pi. 10, 
fi^^ 5, Assam; U.innax,, plagiosoma, and chrysis (Bens.) varr., 
pi. 11. figs. 2 & 3, pi, 41. fig. 3 ; U. tHrostris (Bens.), pi. 11. fig. 0, Moradabad ; 
U. pachysoma (Bens.), pi. 12. fig. 1, Assam; U. theca (Bens.), pi. 12. fig. 5, 
Bundelkund; U. Uoma (Bens.), pi. 12. fig. 6, near Bombay; U.jenJdnsianus 
(Bens.), pi. 41. fig. 3, Assam; U.hirmamis (Blanf.), pi. 42. fig. 1, Bhamo; 
U. foliaceus (Gould) (Anthony), pi. 42. fig. 3, Birmah and Pegu; 
U. marccns (Bens., Haul.), pi. 42. figs. 4-6, Assam ; U. crispahis (Gould), 
pi. 45. fig, 1, Birmah ; U, tcnnenti, new name for Mya corrugata (Wood nec 
Muller), Hanley, ibid. pi. 45. figs. 7-9, Ceylon ? ; U. gc7ierosus (Gould.) pi. 46. 
figs. 4 and 6, Pegu. 
Monocondylea tumidn (Morelet) figured by J. Mabille, R. Z. (2) xxiii. p. 51, 
pi. 5. figs. 6 7, Cambodia. 
Alasmodon rnargaritifera (L.) : some notes on its anatomy and pearls, by 
R. Garner, P. Ij. S. xi. pp. 426-428. 
Alasmodonta nicobarica (0. Fabr., MS.), sp. n., Morch, J. de Conch, xx. 
p. 327, and Vid. Medd. 1872, p. 29, Nicobar Islands, allied to A. zollmgeri 
(Mouss.). 
Anodonta. S. Clessin comes to the conclusion that all the 
forms found in mid-Europe, and usually distinguished as sepa- 
rate species, are dependant on the quality of the water and soil 
in and on which they live, and can be raised by transferring 
living specimens to the proper water. A. cygnea (L.) is the 
form occurring in stagnant water with muddy bottom ; cellensis 
(S(!hrdt) in the like, with a little, and A. rostrata (Kokeil) witli 
very abundant, vegetable mould and earthy sediment; A. jns- 
chinlis (Nilss.) in tranquil crocks of rather large rivers; A. pon- 
derosa (Pfr.) in the like, with plenty of lime ; A. anatina (L.) 
in the current of small streams; A. lacustris (Held) in Alpine 
lakes with lime bottom; and A. complanata (Ziegl.), an abnor- 
mality occurring singly among the others. CB. Ver. Regensb. 
xxvi, pp. 83-97. 
A. anatina (L.), var. n. lacustris, from several lakes in S. Bavaria, with 
subvar. rostrellata [rostell-'], from lake Starnberg, and subvar. callosa (Held) 
from the Chiemsee. Clessin, Mai. Blatt. xix. pp. 119-122. 
A. cygnea (L.) piscinalis (1j.) : their specific distinctness defended by 
H. V. Maltzan, Arch. Ver. Mecklenb. xxvi. pp. 91 & 92, 
MYTILIDiE. 
Mytilu.s edtdis (L.) spawns on tho northern coast of Germany in April and 
May, and is used as food by the lower classes, chiefly when other provisions 
are scarce. A. Metzger, JB. Ges. Hannov. xx (1871), p. 29. — The same, from 
Kiel, figured by Meyer & Mobius, Fauna &c. ii. pp. 73-77, pi. 11 : fig. 5 
represents the comparative thickness of English and Baltic specimens ; fig. 6 
