51 

 Or1[>iculafi*liis, Dumeril. Craniidce. 1 806. 



Zool. Analyt. p. 168. (= Orbicula, Cav.) 



O&'blctiladse, M'Coy. Lyopomata. 1 844, 



Carb. Foss. Ireland, p. 103. Fam. Brach. cont. Orhicula. Adt. King, 

 Aim. Mag. Nat. Hist, xviii, p. 28, 1846. {=^Di8cinidw.) 



OrbicBaBaclae, D'Orbigny. Lyopomata. 1849. 



Cours El6m. Pal. p. 80. Fam. Brach. coat. Siphonotreta, Orhicella, Or- 

 liculoidea, Orbicula, 



OrbBCulBifia, Agassiz. Lyopomata. 1 847. 



Nom. Zool. Index, p. 757. = Oriiculidce, M'Coy corrig. Not Orbicitlina, 

 Lain. gen. Rhizop. 



Ofi'bicuQoidea, D'Orbigny. Biscinidce. 1847. 



Comptes Rendus, xxv, p. 269. No ex. cited. Ann. Sci. N'it. xiii, 1850, 

 p. 351. No ex. cited. Prodr. Pal. Strat. 1849 (Sil.), p. 21. Ist sp. 0. 

 Morrisii, " D'Orb. 1847 ", Dav. Mon. Sil. Brach.'p. 65, pi. vii, f. 10-12. Two 

 other sp. cited as of "D'Orb. 1848". It would appear as if 0. Morrisii 

 must be considered as the type. Dav. 1856, pi. xiv, f. 1-3, cites O. ellip- 

 tica, Kutorga sp. (^Scliizotrcta) as type or example of both Orbiculoidea and 

 Schizoireta, &s also in 1853, p. 129, t. ix, f. 253-255. It is, however, only 

 the type of the latter, though both may be congeneric. (Comj). Schizo- 

 treia, Kut.) 



Ofi°ithotha*ix, Davidson. Productidw. 1 8d»CI. 



Intr. Expl. pi. xii, f. 27 ; lapsus = Orihoihrix, Geinitz. 

 ^r^hanafoonites, Pander. Strophomenida;. 1 830. 



Beitr. Geogn. Russ. Reiches, p. 80, t. iii, f. 7; xxviii, f. 18, generic 

 diagrams. 1st sp. p. 81, t. xx'ii, f. 1, (Sil.) 0. transversa, Pander, 1. c, 

 which with eleven of Pander's eighteen nominal species is referred by 

 Bronn, Ind. Pal. iii, p. 852, to Orthis caUigramma, Dalman, Ter. p. 28, t. 2, 

 f. 2. See Orthis. Syu. Scldzoplwria, King. (= Orthis, Davidson.) 



Oii'thndaB, Woodward. Arthropomata. 185^. 



Man. Rec. and Foss. Shells, p. 229. Fam. Brach. cont. genera Orthis, 

 Strophomena, Davidsonia, Calceola. 



Orthis, Dalman. Strophomenidw. 1828. 



Kougl. Vet. Acad. Handl. f. 1827, pp. 93, 96. 1st sp. (queried by Dalm.), 

 0.? pecten, Wahl. sp. Act. Upsal. viii, p. 66; Dalm. 1. c. p. 110, t. 1, f. 6. 

 2d sp. (also queried), 0. f striatella, Dalm. 1. c. p. Ill, t. l,f. 5; 3d (not 

 regarded as typical by Dav.), 0. zonata, Dalm. 1. c. p. Ill, t. ii, f. 1 a-e 

 (not= 0. adscendens, Pander); 4th sp. 0. callactis, Dalm. 1. c. p. 112, t. ii, 

 i. 2; 5th sp, 0. caUigramma, Dalm. 1. c. p. 114, t. ii, f. 3 a-d; Dav. 1853, 

 t. vii, f. 127. This and the 4th sp. are taken as typical by Davidson. 

 Syn. Schizophoria, King ; Orthambonites, Pander. Not Orthis, Mke. 



Orthis, Menke. TerehratuUdce. 1830. 



Syn. Mu3. Meukeanum, ed. ii, p. 9G. Sole ex. Anomin truncata, Lin. sp. 

 Dav. 1856, pi. vii, f. 9-12, Id. Philippi, Moll. Sicil. ii, p. 69 ; i, p. 95, t. 

 vi, f. 12. Not congeneric with any of Dalman's species. ( = Megerlia, 

 King.) 



