MOLLUSCA. 699 
P. nohilis, esqidlatera : 1. riifescens squamis brevibus = P. oheliscus 
(Cbemn., Reeve, fig. 3). 
P. nohilis^ /3. cequilatera : 2. rufescens vel albido-fusca, squamis longio- 
ribus (Chemnitz, fig. 777). 
P. nohilis, y. incp.quilatera : 1. rufescens, squamis longis = Ohemn. fig« 
778 =P. muricata of Poli, Philippi •, nohilis /3 of Lam. Reeve, fig. 57 
P. nohilis, y. incequilatera\ 2. albida vel fiisca, squamis angustis=a«.'/ca* 
tosquamosa. Reeve, fig. 10. 
Quite doubtful and not recognizable are P. marginata (Lam., Phil.), P. 
vitrea (Gmel., Phil.), saccata and papyracea of Gravenhorst, founded on 
young shells or even fragments. WeinkaufF, i. pp. 232-240. 
Gonzalez Hidalgo enumerates the same three species with a similar 
synonymy, pectinata (L.) is found also at Cadiz. He agrees with Reeve 
that the name rudis (L.) is to be left to the West-Indian species figured in 
Reeve’s Conchologia Iconica : Journ. Conch, xv. pp. 167-170. To which 
Jeffreys makes objections, ibid. p. 231. 
Pinna, sp., described without name, from the Bay of Yeddo : Lischke, Mai. 
Blfitt. xiv. p. 179. Probably the same which has been found at the same place 
by the Recorder, and which in its very young state has been named P.japo- 
nica by Hanley : Martens, Preuss. Exped. i. p. 141. 
OSTRACEA, Cuv. {Pectinacea, Ad.). 
Arcidas. 
Area nom (L.) very variable in shape. A. tetragona (Poli) is now ac- 
Imowledged to be a distinct species ; it may be a form branched off from noce 
in early youth, and propagated in its deformed state, which may have been 
caused by its dwelling in deep water. A. harhata (L.) also variable in 
shape, more common and larger in the Adriatic than elsewhere. A. lactea 
(perhaps not of Linn^, but of most authors) also most variable ; a subrotund 
variety of it is A. gaimardi (Payr.) j another from the Adriatic comes very near 
to the northern nodidosa (Miill.). A. diluvii (\jom.') = antiquataoi Mediterra- 
nean conchologists, not of Linne ; a large recent specimen has the scratches 
on the area arranged in a manner very like to that of the fossil A.Jichteli 
and turonica. A, imhricaia (Poli, not Bruguiere) perhaps (Reeve, 
fig. 122). Weinkauff, i. pp. 190-202. 
Area injlata, cm'nea, and ohtusa (Reeve), from the Bay of Yeddo. Lischke,' 
Mai. Blfitt. xiv. pp. 177, 178. — The first is very common at Yokohama. Mar- 
tens, Preuss. Exped. i. p. 140. — A. hroughtoni (Schrenck), from Hakodate 
and Nangasaki. Schrenck, 1. c. p. 678, pi. 24 [apparently identical with 
inflata~\. 
Area angusta, sp. n.. Bunker, Novitat. Conch, p. 93, pi. 31. figs. 8-10, 
Feejeo Islands ; A. insignis, sp. n., id. ib. figs. 11-13, locality unknown. 
Parhatia vennsta (Bunker, Mai. Bliitt. 1869) figured, Novitat. Conch, pi. 
31. fig. 1 ; B. mollis and B. grayana, spp. nn.. Bunker, ibid. p. 92, pi. 31. figs. 
2-4 and 6-7, the first from the Feejee Islands, the second from India. 
Scapimla deltce, sp. n., Blanford, .Toum. As. Soc. ii. p. 71, pi. 3. figs. 7-10, 
twice as broad as high. Belta of the Irawad}^, in brackish water, under 
stones in creeks, adhering by a byssus. 
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