LAMELLIBRANCHIA. 
203 
(Grould), Savoy, and sikhimensis (Lea), Assam ; Hanley & Theobald, 
Conch. Ind. pp. 43 & 44, pi. evil. figs. 2-7. 
Unio massini, sp. n., Morelet, Series Conch, iv. p. 348, pi. xv. figs. 2 
& 3, Cochin China, near gravidus (Lea) ; U. misellus, micropterus^ and 
pelUs-lacerti (Morelet, 1865 & 1866), id. I, c. pp. 341, 349 & 355, pi. xiv. 
fig. 2, pi. XV. fig. 6, and pi. xvii. fig. 5 ; U. scohinatus (Lea) = mandarinus 
(Mor., 1864), including as a variety venustus (Morelet, 1865), and U. 
rusticus (Lea), including as a variety paivoeanus (Morelet, 1865), id. 1. c. 
jpp. 354 & 353, pi. xvii. figs. 6 & 2 ; U. imperialis (Mor., 1862) = Haine- 
sianus (Lea), megapteru^ (Mor., 1864), = delphinus (Cruner) juv., 
abnormis (Mor., 1862) = gravidus (Lea), id. 1. c. pp. 342, 345 & 347 ; all 
from Siam, Cambodia, or Cochin China. 
Unio parreyssi (V. d. Busch, 1848) = sennariensis (Kuster) var. n. 
schweinfurihi i E. von Martens, in Pfeiffer’s Novitat. iv. p. 140, pl.cxxxii. 
figs. 3-5, Tondj River (Upper Nile, Western tributary). 
Plagiodon rotundatus (Mouss.) ; Pfeiffer, Novitat. iv. p. 139, pi. cxxxi. 
figs. 8 & 9, S. America. 
Castalia ecarinata (Mouss.) ; id. I, c. p. 140, pi. cxxxi. figs. 10 & 11, 
Puerto Nuevo, Magdalena. 
Pseudodon (Could) is distinct from Monocondylus [-cert, Orb.) by the 
teeth of the hinge being smaller, sometimes rudimentary, and the posi- 
tion of the left tooth behind the right. To it belong P. depressus 
(Miihlf.) = Unio bonellii (F^r.), and an undescribed species in Europe, 
rhomboideus (Lea), from Mesopotamia, cambodiensis (Petit, 1865) = 
U. subtrigonus (Sow., 1867), zollingeri (Mouss., as Margaritana') = cumingi 
(Lea, as Anodonta\ mouhotianus (Lea, 1863, as Monocondylcea)^ tumidus., 
orbiculariSy and exilis' (Morelet, 1866, as Monocondylus) y from Siam 
and Cambodia. Morelet, Series Conch, iv. pp. 334-341, the last three 
figured, pi. xvi. figs. 1 & 5, and pi. xvii. fig. 1. 
DipsaSy Leach, 1814, nee Laur., 1768 {Reptilia)y = Barbalay in an 
anonymous catalogue attributed to Humphrey, without definition, 1797, 
= Cristariay Schumacher, 1817, which last name should be used ; E. v. 
Martens, JB. mal. Ces. ii. p. 136. 
{^Cristaria’] Dipsas bellua (Morelet, 1866, as and 
(Solander) var., both from Cambodia, described ; id. 1. c. pp. 331-333. 
Cristaria fnegadesmay E. von Martens, SB. nat. Fr. 1875, b* 3, Mal. Bl. 
xxii. p. 187, and Novitat. Conch, iv. pi. cxxxv. fig. 1, Lake Poyang, China; 
C. reiniana, id. JB. mal. Ges. ii. p. 136, pi. iii. fig. 1, Yeddo : spp. nn. 
Anodonta complanata (Ziegl.) differs from the other European species 
in some histological peculiarities, the stalk by which the egg is attached 
within the ovary being larger and surrounded by a solid refractory ring, 
and the larger granula of the yelk being fewer ; also by the colour of 
the eggs within the gills being white instead of yellow. Flemming, 
Nachr. mal. Ges. 1875, pp. 35-37. 
Anodonta. Several exotic species are described and figured by Clessin, 
in Kiister’s Conch. Cab. pts. 234 & 239. 
Anodonta martensiyidi. 1. c. p. 183, pi. Ixiii.' fig. 2, Siam ; A. lemeslii and 
linguiformiSy Morelet, Series Conch, iv. pp. 328 & 329, pi. xiv. figs. 1 & 5, 
Cambodia: spp. nn. 
