344 CEETACEOUS PELECYPODA 



148-151. — A. cordaria, stqnacretacea, Merope, and Gravesii of d^Orbigny are merely known 

 by name. 



152. — A. Olislponensis, Sharp e^ probably a Trigonoarca. 



153-154. — A> inclinata, Uss.^ and A. Eeussicma, Nyst^ fa7tgulataj Rss.^ A. suhangulata, 

 d^Orb.)^ are true Arcm. 



155. — A. isopleura, Rss., has an appearance of an Area, bat figure and description are 

 insufficient. 



156. — A. Geiniiziij Uss.^ is a Barhatia^ (Favre^ Moll, foss, de Lemberg_, 1869^ p. 125). 



157. — A. ftircifera, Miinst.^ apparently an Area, 



158-162. — A. propinqua, striatula, bicarinata, of Reuss^ tenuistriata (Favre, Moll. foss. de 

 Lemberg, 1869^ p. 124^) and radiata of Miinster belong to Barhatia. 



163. — A. arcacea, Rss.^ a very small, but typical Trigonoarca. 



164. — A, Gosaviensis, (Ciicullma) , Zittel_, is a very elongated Trigonoarca. 



165-166.- — A. ScJuvahenatd, incequide^itata, and Lommelii, Zittel^ are Barhatim, 



167-168. — A. trigomday Zittel^ and most likely also striatissima, Hag.^ belong to Area. 



169. — A. trapezoidea, Gein., is an Anomalocardia. 



170-171. — A. undidata and pygmoea^ Rss._, may be peculiar forms of Trigonoarca , or perhaps 

 of Scapharca. 



172-173. — A. bifida and dicfyopJiora, Rss., resemble Area in external form. 



174. — A. curta, Nyst^ 1848 /^= A. Beussi, d^Orb.j 1850 = tnmcata, Rss., non Sow.), pos- 

 sibly a Grammatodon. 



175. — A. Octavia, d^Orb.^ an Anomalocardia. 



176-179. — A. (Oucidlma) Austriaca and bifasciata, Zittel, A. carinifera, SLndi globtdosa, Giimbel, 

 (Bay. Alp., 1861, p. 570, non A. globidosa, Desh., 1824). 



180-181.—^. LeopoUensis and Galiciana, Alth, (Favre, M. foss. de Lembg., 1869, pp. 126 and 

 127,) belong to Trigonoarca. 



182. — A. gra7iulato-radiata, Mth, {¥2iYYQ,'K. ^o^s. de Lembg., 1869, p. 128,) apparently an 

 Area. 



183-189. — A. rhombea, Nilss., (non idem Born, ? = glabra. Sow.), subglabra, d'Orb., (glabra 

 apud Goldfuss, pi. 124, fig. 1 c, sed non glabra apud Rss. = glabra, Park, et Sow. = Cue. 

 carinata, Sow.), ovalis, Nilss., coneentrica oi Romer, exaltata, Nilss., Chimiensis, Giimb., and 

 crassitesta, Zitt., are species of Trigonoarca. 



190-191. — A. tricarinata, Gein., cmieata, Rom._, are quite uncertain. 



192. — A. decussata, Sow., is a Ciicullma. 



193-194. — A. (Cueul.) Goldfussi and texta of Romer apud Miiller are considered by the latter 

 author to be the same as two forms from the Aachen cretaceous deposits, which probably do not differ 

 from d'Orbigny^s subglabra, this being closely allied to our Indian Trigonoarca Gamana. 



195-196. — A. orbicidaris and Boemeri, Gein., are uncertain; they probably both belong to 

 CueuUma; the former Reuss states to be the same as his Axiyicea insetdpta, which is not improbable. 



197.—^. securi/ormis,^ Kner., (Denksch. Akad., Wien, iii, p. 314, and Favre, M. foss. de 

 Lemberg, 1869, p. 129), an Area-like shell, but as the ventral margin does not show a tendency 

 to insinuation, it may rather be an elongated Cucullaa. 



198-201. — Area cequilateralis , (non Cue. mqudateralis, Meek), caudata, exornata, and Omalii, 

 Briart et Cornet, (Foss. de la meule de Braiquegnies, p. 57 et seq., Mem. Cour. Acad. Belgique, 

 xxxiv, 1870^) partially belong to Cueullcea, partially to Trigonoarca. 



202.— J[. Aquisgranensis, Miiller, (Suppl. zur Monog. Pet. Aachener Kreidef., 1859, p. 10,) is 

 either a Barbatia or an Area. 



* Non Area securiformis apud Nyst, which is a Dolahra. 



