15 



AthyFBS, M'Coy. Spiriferidw. 



Carb. Foss. Ireland, pp. 128, 14G, f. liJ. Erroneous diagn. No type 

 specified. First sp. p. 147, is Ter. concentrica, von Bucb, Chenn, Man. ii, p. 

 216, f. 1108-10. Davidson, 1856, pi. ix, f. 23,29,30. Etyni. a, without; 

 thuris, a door or deltidium (not doorway or foramen). Syn. Seminula, 

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

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



Atfoyras, Davidson. Spiriferidce. 1§52I. 



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. 



il.iljyris, Davidson. Spiriferidce. 18«56. 



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

 (=^ Athyris, M'Coy.) 



AtreiMOsia, Rafinesque. BracJiiopoda. i8Sfi. 



Mon. Biv. Sbells Ohio, p. 8. Fam. Brach. cont. gen. Orhicula, Stro- 

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



Atretia, Jeifreys. Bhynchonellidce. IS'J'G, 



Proc. Roy. Soc. London, 1870, 121, p. 421, U 36. 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, Jeffr. {z=zBimerella, 

 Zittel, g. 17.) 



Atrya»a, Dalman. Atrypidce. 182S. 



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. Spirigenna, D'Orb.) 



Ats-ypa, M'Coy. Atrypidce. 1844. 



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

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



Ata'ypidse, Dall. Arthropomata. 1877. 



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

 ina, and probably Davidsonia. 



Well distinguished from Spiriferidw by the direction of 

 the spires, which must have necessitated a wholly different 

 arrangement of the internal organs. Indicated long since 



by D'Orbigny. 



♦■ 

 AtBlacoa^hyiicfitis, Dittmar. Arthropomata. 1871. 



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

 Type A. 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. 



