15 



Athyris, M'Coy. Spiriferidw. 1844. 



Carb. Fobs. Ireland, pp. 128, 14G, f. lii. Erroneous diagn. No type 

 specified. First sp. p. 147, is Ter. concenirica, von Bucb, Chenu, Man. ii, p. 

 216, f. 1108-10. Davidson, 18.50, pi. ix, f. 23,29, 30. Etyui. a, withont; 

 thuris, a door or deltidium (not doorway or foramen). 6yn. Semimila, 

 M'Coy, 1844; Aclinoconclms, M'Coy, 1844; Spirigera, D'Orbigny, 1847; 

 Euthyris, Quenst. 1871 ; Athyris, Davidson, 1856, not 1853. 



Athyris, Davidson. Spiriferidce. 1 §53. 



Intr. p. 72, pi. vi, f. 71, 72. Type Atrypa tumida, Dalman, sp. Ter. 

 p. 134, t. V, f. 3, 1828. Davidson, 1856, pi. ix, f. 33,37. {— Meristella, 

 Hall, not Athyris, M'Coy.) Cf. Meristella, Hall, 1862. 



Ailiyris, Davidson. Spiriferidcc. 1 ^^G, 



Intr. p. 166, pi. ix, f. 23, 29, 30. Type A. concentrica, von Bucb, M'Coy. 

 (:= Athyris, M'Coy.) 



* 



Alreniosia, Raflnesque. BracMopoda. 1831. 



Mon. Biv. Sbells Ohio, p. 8. Fam. Brach. cont. geu. Orhicula, 8iro- 

 phesia, Dielipsites, Trunculites, Productus, Styriasis, Goniclis, Megarites. 



Atretia, Jeffreys. Bliynchonellidce. 187G, 



Proc. Roy. Soc. London, 1870, 121, p. 421, U 3G. Type A. gnomon, Jeffr. 

 MS. No description of genus or species. Ann. Mag. Nat. Hist. Sept. 

 1876, p. 250. Genus and species fully described. Dav. Suppl. Brit. fos. 

 Brach. 1874, p. 7, pi. i, f. 7-10. Syn. Cryptopora, Jefifr. {^=Dimerella, 

 Zittel, q. V.) 



Atrypa, Dalman. Atrypidm. 1828. 



Kongl. Vet. Acad. Handl. 1827, p. 102. First sp. p. 127, t. iv, f. 2. 

 Anomites reticularis, Wahlenberg, Act. Upsal. viii, p. 65. Davidson, 1856, 

 pi. ix, f. 39-46. (Cf. Spirigerina, D'Orb.) 



Atrypa, M'Coy. Atrypidcc. 1844. 



Carb. Foss. Ireland, p. 150, f. 30. First sp. Terebraiula acuminata, Sow- 

 erby, Min. Conch, t. 324, 1823. Dav. 1856, t. x, f. 19. 



Atrypidae, Dall. Arthropomata. 187T. 



Fam. Brach. cont. Atrypa, Anoplotheca, Zygospira, Cailospira, Koninck- 

 ina, and probably Davidsonia. 



Well distinguished from SpiriferidcB by the direction of 

 the spires, which must have necessitated a wholly different 

 arrangement of the internal organs. Indicated long since 

 by D'Orbigny. 

 Aulacorliynchw^, Dittmar. Arthropomata. 1871. 



Verb. K. Min. Ges. St. Petersburg, 2te set. vii, p. 1, t. 1, f. 1-13. (Carb.) 

 Type J. Pachti, Dittmar, 1. c. pp. 2-4, &c. 



A remarkable form of doubtful family relations, of which 



species have been referred to Chonetes and Leptcena. 



