60 Moll. 
MOLLUSCA. 
Anodonta sempervivens^ sp. n., Deshayes & Jullien, N. Arch. Mus. x. 
(1874) p. 120, pi. V. figs. 4 & 5, Cambodia ; a specimen remained alive 
removed from the water for eight months \_cf. Zool. Rec. xii. p. 136 ; 
this species scarcely differs from A. exilis (Lea)]. 
Mycetopus [?] iridineus (Heude, 1874) ; Heude, 1. c. pi. viii. fig. 19, 
China. 
Columba (Lea). Under this generic name, long pre-occupied by 
Linn6 in Aves, the 3 known species of Leila, viz., hlainvilleana (Lea), 
castelnaudi, and pulvinata (Hupd), are described and figured by S, Cles- 
sin, 1. c. pt. 248 (vol. ix.), pp. 252-255, pis. Ixxxiv.-lxxxvi. 
MYTILIDiE. 
Mytilus latus (Lam.), var. n., and M. crassus, sp. n., J. E. T. Woods, 
P. R. Soc. Tasm. 1876, p. 29, Tasmania. 
Madiola albicosta (Lam.), varr. nn. polita and nebulosa, id. 1. c. p. 30, 
Tasmania. 
Kidderia, g. n. Shell minute, byssiferous, concentrically sculptured ; 
two minute cardinal teeth in each valve ; ligament partially internal, 
attached to a more or less prominent process on the inner hinge-margin 
of each valve ; pallial line simple ; a single anterior muscular scar. K. 
minuta, sp. n., Kerguelen Island and Tierra del Fuego. Modiolarea 
pusilla (Could) probably belongs also to this genus. Dali, Bull. U. S. 
Mus. Ko. 3, pp. 46 & 47. 
Crenella pelludda (Jeffreys, 1859, as Limopsis) is not the young state 
of C. rhombea^ but a distinct species, dredged also near Palermo at 30-90 
metres ; Monterosato, Poche note,&c., p. 7. 
Idas, g. n. Shell transversely oblong, thin, nacreous ; ligament 
external, no cartilage, hinge toothless, hinge-plate crenulated on both 
sides of the beaks ; shape resembling that of Area. I. argenteus, sp. n., 
Atlantic, 900-1400 fathoms. Jeffreys, Ann. N. H. (4) xviii. p .429. 
JIacrydium vitreum (Holboll) : living specimens from the Atlantic, 
^435 fathoms, enclosed in an agglutinated case of ooze with Globig evince ; 
id. ibid. 
Dreyssenidac. 
Dreyssena polymorpha (Pall.), caspia (Eichw.) = Mytilus albus (Sie- 
maschko), and D. rostriformis (Desh.), all living in the Caspian Sea, the 
two latter figured ; Grimm, Kaspinkoe more i ego fauna, i., pp. 
143-147, pi. vi. figs. 4 & 5. 
AviCULIDAfi. 
Avicula fusco-purpurea, sp. n., E. Smith, Ann. N. H. (4) xvii. p. 405, 
Rodriguez Island . 
Arcida:. 
Area despecta, sp. n. (the “ moussole ” of Adanson, Voy. Senegal, 
