00 Moll 
MOLLU8CA. 
Deeissenid^:. 
Dreissenia bourguignati and chantrii , spp. nil., Locard, Ann. Mns. Lyon, 
iii. pp. 260 & 261, pi. xxiii. figs. 1-4, both from the Euphrates and Lake 
of Antioch. 
TAXODONTA. 
Arcime. 
Pectuncuhis robustus , sp. n., Sowerby, P. Z. S. 1883, p. 31, pi. vii. fig. 4, 
locality unknown. 
Nuculidj:. 
Leda pernula (Mull.) varr. nn. costigera and lamellosa ; Leche, in Nor- 
denskiold’s Yega Exped. Yetensk. Iakt. iii. pp. 447 & 448, pi. xxxiii. 
figs. 23-26, Northern coast of Siberia. 
Yoldia arc facet. (Gray) var. n. inflata and Y. Jiyperborea (Lov.) ; Leche, 
l. c. pp. 444 & 445, pi. xxxiii. figs. 16-22, Northern coast of Siberia. Y. 
arctica (Gray) very common in the sublitoral region of the Kara Sea ; 
Stuxberg, op. cit. i. p. 756, woodcut. 
HETERODONTA. 
Unionid^. 
Critical notes on the species of Unio and Anodonta of Lake Balaton 
distinguished by Servain ; they are all well-known species in various 
stages of age : Hazay, Mai. Bl. (2) vi. pp. 195 & 196. 
J. R. Bourguignat criticizes some determinations of Italian Unionidce 
by Stabile and Kobelt, and enumerates 53 species, arranged in 20 groups. 
The following are new: — Unio latinus , Pontine Marshes, sebinensis (Uzi- 
elli, MS.), Lake d’lseo, campsus (Uzielli, MS.), Pisa, verbanicus (Letour- 
neux, MS.), Lago Maggiore, glaucinus (Ziegl. p), Milan, gurkensis* (Ziegl.), 
Lake Garda, delpretii , Lake Mergozzo, near Lago Maggiore, benoiti , Sicily, 
uziellii, Rome, vittorioi , Pisa, pisanus (Uzielli, MS.), Pisa, villce (Stabile, 
MS.), Milan, veillanicus (Blanc, MS.), Lago d’Avigliana, gentiluomoi , lo- 
cality not indicated, pecchiolii , Arno, monterosati, Lentini, in Sicily, bi- 
vonianus, new name for turtoni (Philippi, nec Payrandeau), Syracuse, 
blanci } Arno, campanus (Blanc, MS.), S. Germano, near Monte Cassino, 
isseliy Pietrasanta and Yiareggio, Tuscany, euccillistellus = U. pictorum 
var. parva (Stabile), Lake of Como, callichrous (Letourneux, MS.), Pied- 
mont and Danube at Belgrade, danconce, Arno, caficianus } Syracuse, vul- 
gariSy new name for longirostris (Stabile, nec Ziegl.), Tresa River, padanus 
(H. Blanc, MS.), Po at Turin, strobeli (Uzielli, MS.), Parma, pedemon- 
tanuSy new name for requieni var. (Kobelt, Iconogr. fig. 1148), Lago 
* Gurk is a locality in Carniolia, not in Italy. — Rec. 
