27 



Discina, Turton. Craniidce. 18S2. 



Dithyra Brit. p. 238, ex parte. (= Crania sp.) 



]>iscmella, Hall. {Incertce sedis.) 1871. 



23d Regent's Eep. p. 24'6, 1873. Extras Mar. 1871, fide Hall. Diag- 

 nosis only; no ex. cited. Gen. incert. Said to =i= operculum of Hyolithes 



(Pteropoda). 



]>i$$cmidaB, Gray. Zyopomata. 1 840. 



Synops. Brit. Mus. i, p. 155. Ann. Mag. Nat. Hist, ii, p. 439. Fam. 

 Brach. cont. Disdna. 



l>i§emid£e, King. Lyopomata. 1 850. 



Perm. Foss. p. 81. Fam. Brach. cont. Disdna^ Oriiculoidea, Trematls. 



JSJiscmidaB, Davidson. Lyopomata. 1853. 



Intr. p. 51. Fam. Brach. coat. Disdna (? OrMculoidea, Trematis), Sipho- 

 notreta (? Acroireta). Ibid. 1856, p. 90. 



DisciniBia, Agassiz. Lyopomata. 1 847. 



Nom. Zool. Judex, p. 366. (=:= Z) JscimdcE, Gray corrig. ) ' 



Discinisca, Dall. Biscinidce. 1871. 



Bull. Mus. Comp. Zool. iii, p. 37, May, 1871. Type Disdna lamellosa, 

 Broderip, Eeeve, Conch, Icon. pi. i, f. 4, 1862. (= Disdna, auct. not Lam.) 



Eatofiiia, Hall. Rhynchonellido}. 1857. 



lOth Regent's Rep. p. 90, f. 1-7. Np diagnosis. First sp. Atrypa medi- 

 alis, Vanuxem, Pal. N. York, iii, t. 37, f. 1. (L. Held.) Ibid. 12th 

 Regent's Rep. Oct. 1859, p. 35, f. 1-7, 1st. sp. E, peculiaris, Conr. 1841. Not 

 Eaionia, Edgar Smith, gen. Gasterop. 1875. 



£ichwaidia, Billings. (?) RhyndionelUda;. 1858. 



Rep. Prog. Canadian Geol. Surv. p. 190. (L. Sil.) Type, p. 192, f. 24 

 a-e, 1. c. E. suhtrigonalis, Bill. Hall, 20th. Reg. Rep. p. 274. (Relations 

 doubtful.) Syn. Didyonella, Hall. 



Elonia, Meek & Hayden. Ehynchonellidw. 18G4. 



Pal. Upper Missouri (Jurassic), p. 70, September ; lapsus, pro Eatonia. 

 (= Eatonia, Hall.) 



Esitelef es, Fischer de Waldheim. Arthropomata. 1 820. 



Oryct. Gouv. Moscou, 1830, p. 193, t. 26, f. 6-7. Ex. E. glabra, Fisch. 1. 

 c. Ibid. Bull. Soc. Imp. Nat. Moscou, 1843, p. 16. Ex. E. PUllipsi, Fisch. 

 {Gen. incert., probably = Spirifer, Sby.) 



Eisitellites, G. B. Sowerby. Arthropomata. 1 843. 



Conch. Man. ed. ii, p. 144 ; lapsus (= Enteletes, Fisch.). Said by Sow- 

 erby to be a heterogeneous assembly. 



Eaatog^yrae, Dalman. Arthropomata. 18S8. 



Kongl. Vet. Acad. Handl. f. 1827, p. 89. Sect. Brach. cont. Delthyris, 

 Cyrtia, Atrypa. 



5, Morris. Arthropomata. 1846. 



Quart. Jouru. Geol. Soc. Lond. ii, p. 387. Division of Terehratida 

 cont. sections characterized by sculpture. 



