40 



genus of birds, and also because one of tbe subgenera must 

 be left by tbe rules of nomenclature to contain tbe typical 

 species, and therefore Pronites would necessarily lapse even 

 if it were not preoccupied. 



Mcnaliacliia, Woodward. Atrupidw. 1 



Man. Rec. & Foss. Shells, p. 231, f. 145; Bronn, Thierr. iii, i, 302, 

 1862. T^^pe Producia Leonliardij'Wmsm.; lajisua, = Koninclcina, Suess. 



KoBiIiickliia, Suess. Atrypidce. tS^t 



Davidson, 1853, p. 92. Type Producta Leonhardi, Wissm. Dav. 1. c. 

 . pi. viii, f. 194-193. (Trias.) 



M®miiM;loiais2ie, Davidson. Artliropomata. 18^! 



lutr. p. 51. Fain. Bracb. cout. KonincMna. 



M©Flia§"iHia, Davidson. OhoUdcs. 18f^ 



Mou. Sil. Brach. expl. pi. 1. lapsus, =Katorgi)ia, Bill. 



Mraiissia, Davidson. TerehratuUdm. ] 



Aon. Mag. Nat. Hist, ix, p. 369. Type K. rubra, Dav. 1. c. = Anomia 

 rubra, Pallas, Mis. Zool. pi. xiv, f. 2, 11, 1766. Eeeve, Conch. Icon, ix, f. 

 37, a-c. Not Kranssia, Dana, 1852, gen. crustac. {==Kraussina Dav.) 



Mr«ras§lita, Davidson. TerebratuUdm, I8iSf5« 



Sitzungsb. K. Ak. Wiss. Wien,Bcl. 37, p. 210, and Anu'als Mag. Nat. 

 Hist. 1881, p. 39. Proposed for Kraussia, Dav. j)raeoc. by Dana in Crus- 

 tacea. 



Mfl'ae^simmsi, Paetel. TerebratuUdce. ISf"^. 



Fam. u. Gatt. Moll. p. 104, lapsus, = Kraussina, Dav. 



MFaMssIoiiaas;©, Dall. Terebratiilidw. 187®. 



Am. Jouru. Conch, vi, p. 100. Subfam. TerebratuUdce cout. Kraussina, 

 Bouchardla. 



Iiri®peaa, Oken. BracMopoda. tStS, 



Zool. vii, p. 249. Fam. Brach. eont. Tcrebratula, Acardo f, Orbicula, 

 Lingula. 



KtitoFg^iEaa, Billings. {Inccrtce sedis.) I8@l. 



Paleoz. Foss. Can. Geol. Survey, i, p. 8, f. 9 (not 8 and 10). Type 

 Obolella einr/ulata, Bill. Sil. (advance sheets Nov. 1861, 1. c). Subg. 

 Uboldla, Bill. 1. c. 



Billings's subgenus was established on tbe internal casts 



of which fig, 9 is a representation. See note on p. 9, 1. c. 



It is very doubtful if it belongs to the OhoUdw at all. The 



valves (figures 8 and 10) therewith delineated are evidently 



not related to Obolella, as already pointed out by Davidson 



(Mon. Sil. Brach., p. 342, app.); and seem to belong not only 



to another species, from the internal cast figured by Bil- 



