MYTILACEA, 
177 
Mytilus haldi, Brusina, = dentimlatus (Benier) 1 Bruaina, Chier. Conch, 
p. 107. 
3Iytilus pharaonis, sp. n., Fischer, J. de Conch, xviii. p. 178, Bed Sea, allied 
to M. hidcns (L.) and domingensis (Lam.). 
Crenella {Modiolaria) mridxda, compta^ and gihhay spp. nn., H* Adams, 
P. Z. S. 1870, p. 792 ; the second, pi. 48. fig. 17. 
Dacrydium, Tor ell, reunited with the genus Mytilus by Jeffreys, Ann. 
N. H. (4) vi. p. 68. 
Dacrydium^ sp. probably new, near to the arctic vitreum (Moller), found in 
great depth of the Mediterranean near Palermo ; the last-named occurs in 
pliocene beds of Italy, and is identical with Modiola pygmma^ Philippi, 1844. 
Allery de Monte Bosato, Bull. mal. Ital. iii. pp. 43, 44. 
Lithodomus lithophagus (L.), its burrowing observed by 
C. Caramagna. The mollusk makes its appearance at regular 
intervals at the orifice of its hollow, and then lets itself drop with 
an audible noise to the bottom. In the fore part of many spe- 
cimens there can be traced spots which have been injured and 
have been repaired by the animal — which tends also to prove the 
mechanical action of the burrowing. In a mole built only 
seven years ago specimens of a length of 13 millimetres and 
11 in circumference have been found. Bull. mall. Ital. iii. pp. 
46-49. 
DaEISSENIDiE. 
Dreissena polymoj'pha, var. dilatata and var. angustaj n., Colbeau, Ann. 
mal. Belg. iii. (i8G8) p. 108, pi. 4. figs. 6j G, Belgium. 
TichogonicL chemnitzii [^Dreissena polyinorphd] has made its appearance in 
the upper part of the Danube at Begensburg. Clessin, Nachr. mal. Ges. 
ii. p. 6. 
Dreissena swinhoei, sp. n., H. Adams, P. Z. S. 1870, p. 379, pi. 27. f. 13, 
Yangtsekiang at Kweifoo. 
AviCULIDiE. 
Perna fulgida, sp. n., H. Adams, P. Z. S. 1870, p. 7, pi. 1. fig 8, Bed Sea. 
OSTREACEA, 
Arcid.®. 
Area scahra, Poli, different from nodulosa, Miill., identical with pulchella, 
Beeve. Weinkauff, Bull. mal. Ital. iii. p. 23. 
Axincea {Pectunculus) arahica, sp. n., already figured in Savigny’s Descrip, 
de I’Egypt, Moll. pi. 10. f. 4, H. Adams, P. Z. S. 1870, p. 792. 
Limopsis concinna^ sp. n., II. Adams, I, c. p. 7, pl. 1. f. 10, Canary Islands. 
NuCULIDA3. 
Nucula, Yoldia, and Lada [^Leda '] . Sowerby^s monograph of 
these genera in the continuation of Reeve^s Conchol. Icon., parts 
284-287, illustrates 39 species (on 6 plates) of the first, 10 species 
(on 2 plates) of the second, and 9 species (on 2 plates) of the 
third. 
