2iQ CRETACEOUS PELECYPODA 



Movt., are recorded from North America by Meek (Smith. Misc. Coll., No. 177, 1SG4, p. 8). 

 Which of these species belong to Trigonoarca (and I suppose most of them) remains 3'et to be 



ascertained. 



247-257. Area aUirostra, Gabb, Prouliana, Shum., quindecemradiala, Gabb, Saffordi, Gabb, 



guhelongata, Con., (non A. subelongata, Nyst, 1848), mlcatina, Evans and Shum., uniopsis, Con., 

 Fancouverensis, Meek, (CibotaJ UnecUa, Con., (non A. lineafa, Goldf.), fCib.J, vuiUiradrata, Gabb, 

 and fCib.J rostellata, Mort., (Meek, ihidem). lu this list the distinction between .Sa/'ia/Iia and 

 Area does not appear to have been carried out. 



258-259.—.^. Alabameyisis, d'Orb., (Prod., ii, 245), A. Eufalensis, Gabb, (Journ. Ac. Ph., 2nd 

 ser., iv, 398 ; see also Nemodon, p. 336). 



260. — Numoarea creiacea, Con., (see p. 339). 

 2G1. — Nemodon Eufalensis, Conrad, (see p. 336). 



262-268. — Area Breweriana, gravida, decurtata, and Hornil, Barbatia Morsel, Cucullma Ma- 

 theicsonii, and trnncaia, (non A. truncata, Sow., 1S33, non A. iruncata, Rss., 1843 = A. curia, 

 Nyst, 1848,) are described from California by Gabb in Pal. Calif, i, pp. 193 et seq. ; besides these 

 two others already mentioned. 



269. — CucuUma inertnis, Gabb, (Pal. Calif., ii, p. 271,) is from Mexico. 



270-273. — Latiarca transversa, Rog-., L. ononcJieila, Rog., L. gigantea. Con., and 

 Anomaloeardia devincta are noticed by Conrad from his lower eocene (? cretaceous) beds (Smith. 

 Misc. Coll., No, 200, 1866, p. 4; see also p. 338). 



274. — Trigonoarca passa. Con., (Am. Journ. Conch., V, p. 43). 

 275. — Trig, cuneiformis, Con., (ibid., V, p. 98). 



Romer notes (Kreidebild. von Texas, p. 53,) two not specifically determined forms of Area 

 and two of CiicuUrea from the cretaceous beds of Texas. 



Conrad described in Lynch's Exped. the following four species from Palsestine, which 

 Fraas (Wiiitemb. Nat. Jahresh., xxiii, p. 233,) partially identifies with known species : — 



276-279. — A. parallela, Con., f^securis, Leym.) ; A. lintea, Con., (^cenomaniensis, d'Orb.) ; 

 A. sub-rotuudata and fabi/ormis. Con. Farther, Fraas says that Courad's supposed Jurassic 

 A. brevifrous is remarkably similar to A. Passi/ana, d^Orb. A great many other supposed 

 Jurassic species Fraas rejects altogether, the species having been based upon worthless casts which 

 cannot be again recognised, and there also seems, he says, very little proof existing in favor of 

 the Jurassic age of those species. It is always difiicult to determine species satisfactorily from 

 east specimens, but especially in cases of such thick shells, as the arclwe usually possess, the 

 determination of species based upon casts becomes an impossibility. 



The following species of the sub-family arcin^e* have been found in our South Indian 

 cretaceous deposits : 



280-293. — Cnculleea aquaia ; Macrodon (? Grammatodon) JapeticHm,Macr. (? Gramm.) di^parile ; 

 Trigonoarca Telagensis, abrupta, Triehinopolitensis, Gamana, Brakminica and Galdrina ; Scnpharca 

 Ponticeriana, ? Seaph. Clellandi ; Barbatia decora, B. diatreta ; Area Jilistriata. They are repre- 

 sented almost equally in all the three sub-divisions of the cretaceous deposits. 



At the end of their review of cretaceous species of Area, Pictet and Campiche, (loe. cit., 

 p. 483,) give a list of names which, they say, should be excluded from the genus " Area," as 

 referring to perfectly unknown species. These names are to a great extent merely the altered appel- 

 lations of various species noted in the preceding list ; they were introduced by Nyst, but it would 

 have been much better if Nyst had reserved his corrections for a little time, and had studied 

 the various generic forms of arcin.k, instead of adhering to Linne's genus "Area" and 

 simply cataloguing the synonyms of the species described. In his desii-e to preserve the unity 

 of Linnets genus he even goes so far as to regard Pleurophorus of King as identical with Area ! 



* Excepting Tsoarca g'M.i already noticed. 



