MOLLUSCA. 
211 
marginal and not sunk in a groove of the' area of one valve. The only known 
species is Etheria stefanensis (Moiicand), found by M. Porte in the Amazon, 
near its mouth, and now hy Mr. Bartlett in the upper part of that river ) it is 
figured 1. c. pi. 38. fig. 7. 
Mytilidte. 
Mytilus ater and M. janeircnsis, sp. n.. Bunker, Verh. zool.-hot. Gesellsch. 
Wien, 1866, pp. 914, 916, the first from New Zealand, the second from Bio 
Janeiro. 
Septifer hilocularis, from New Caledonia, has been dissected by P. Fischer, 
Journ. Conch, xiv. pp. 6-M, pi. 4. It is much more nearly allied to the true 
marine Mytilus, without apical septum, than to Dreissena. 
Sejitifer trautwineanus, sp. n., Tryon, Am. Joimi. Conch, ii. p. 302, pi. 20. 
f. 8, from the Biver S. Juan, Now Granada. 
Mocliola imherhis, sp. n., Brusina, Faun. Moll. Balmat. p. 41, Adriatic. 
AviCULIDiE. 
Evnna. The known species are distributed into several groups and sub- 
genera, with particular regard to the slit in the pearly layer and the apical 
outside furrow in some of the species. Martens, Ann. & Mag. Nat. Hist. 
Febr. 1866, pp. 81-88. 
Order OSTRACEA, Cuvier [Pectinacea, Adams). 
AllCIDiE. 
Arcapancistviynta, Bombay, adamsiana, China sea, pectuncidiforinis, 
Borneo, sp. n.. Bunker, Novitat. Conchol. pp. 87, 88, pi. 30. figs. 4-6, pi. 29. 
figs. 4-6, and pi. 28. figs. 4-6. — Anomalocardia suhmbra, Philippines; n^/ 7 i/ 6 Trt, 
Indian Seas; paudyranosa \_ = nodifcra, Martens, Proc. Zool. Soc. 1860], 
Siam ; carpenteri, Southern Australia, sp. n,. Bunker, 1. c. pp. 83-86, pi. 28. 
figs, 1, 2, figs. 7-9, pi. 29. figs. 10-12, and pi. 30. figs. 7-9. — A. ohlonga 
(Philippi), Mergui, figured, ibid. pi. 29. figs. 7-9. — Barhatia rodatzi, Zanzibar, 
and B. cxhnia, sp. n., locality unknown. Bunker, 1. c. pp. 89, 90, pi. 29. 
figs. 1-3, and pi. 30. figs, 1-3. 
Area raridentata (Wood). Br. Michael Sars considers the arctic A.gla- 
cialis (Gray, Torell), found alive at Melville Island, Spitzbergen, and the 
northernmost extremity of Norway, and fossil near Christiania, to be a larger 
variety of A. raridentata, which diminishes in size gradually towards the 
south. Mich. Sars, Fossile dyrelevninger fra quaternoerperioden, 1865, p. 35, 
pi. 2. figs. 29, 30. 
Nuculida-:. 
Yoldia intermedia (Sars, 1858) is described and figured by Br. M. Sars, 
1. e. ]i, 98, pi. 3. figs. 92-96 ; it is found alive on the shores of Arctic Norway. 
■ — Y. nana, Sars, /. e. p. 99, pi. 4. figs. 118-120, found alive near Christiania 
and at Lofoten. 
Pectinidas. 
Becten midtisquamatus, sp. n,. Bunker, Novit. Conchol. part 8. p. 67, pi. 23. 
figs. 1-3, Cuba. — P. suleieostatus (Sowerb.), ibid. figs. 4-6, Natal. — P. yes- 
soensis (Jay), ibid. pi. 22. — P. leptogaster, sp.n. Brusina, Faun. Moll. Balmat. 
p. 45, Adriatic. 
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