DK. T. DAVn)S(1N OX EECEXT BEACHIOPODA. -tl 



similarly directed iiUites, aud for this geuus he selected the recent Terehralida craniuni. 

 Miiller, as his type. 



In 1880 M. Douville proposed a genus Neothyris for another recent species with a 

 similar long loop, of Mhich the Terebratula lenticularis, Deshayes, would constitute the 

 type. 



I cannot, however, hut consider these so-termed genera to he very nearly conne(!t<Ml 

 and as mere moditications of Waldhcimia, and not sufficiently important to warrant theii- 

 separation into distinct genera. 



After a long examination and much thought, I determined to retain the following ten 

 species and one uncertain one : — 



1. It'ald/iei/nia flavescens, Lamarck 



2. kergmdenensis, Davidson. 



.3. Grayi, Davidson. 



4. sept i (/era, Loven. 



5. Rupluu'lis, Dall. 



0. Wnldheimia floridana, Pourtalcs, 

 7. vvnosa, Solander. 



<S. ■ leniicularis , Deshayes. 



9. [Macundrevla) craniam, Miillcr. 



10. ( ) tencra, Jetfreys. 



Uncertain : Waldheimia IVyviUii, Davidson. 



The characters of hotli Waldheimia and Macandrevia will he found fully recorded in 

 our descriptions of W. flavescens and W. cranium. 



Calcareous spicula are absent or almost so in the species above named. Numerous 

 metamorphoses or changes take place in the shape or development of the loop during;' thr 

 different stages of its growth, as will he fully described in the sequel. 



26. Waldheimia flavescens, Lamarck, sp. (Plate VII. figs. G-19.) 



Terebratula flavescens, Valenciennes apud Lamai'ck, An. sans Vert. vol. vi. p. 24G, 1819. 



Terebratula australis, Qnoy & Gaimard, Voyage de I'Astrolabe, Zool. p. 551, pi. Ixxxv. figs. 1-5, 1831. 



Terebratula incurva, Quoy & Gaimavd, loc. cit. p. 551, pi. Ixxxv. tigs. 11 & 12, 1834. 



Terebratula australis, G. B. Sowerby, Thcs. Conch, p. 349, pi. Ixix. figs. 25-33, 1846. 



Waldheimia australis. King, English Permian Fossils, Pal. Soc. p. 145, pi. xx. figs. 10-12, 1849. 



Terebratula australis, Davidson, Classification of Recent Brachiopnda, Ann. & Mag. Nat. Hist. 2ii(l 

 scr. vol. ix. p. 3U5, 1852. 



Waldheimia Jlavescens, Davidson, Brit. Foss. Bracli. vol. i. p. 64, figs. G & 7, 1853 ; R. Owen, David-son's 

 Mon. Pal. Soc. vol. i. chapter 1, 1853. 



Waldheimia australis,?). Woodward, A Manual of the Mollusca, p. 216, figs. 113 & 111, 1854; Gratiolet, 

 Etudes Anatomiqucs sur la Terebratula australis, Journal de Concliyliologie, 1857; A. Hancock, On 

 the Organization of the Brachiopoda, Phil. Trans. Royal Soc. vol. 148, p. 791, 1858. 



JJ'aldheimia flavescens, H. & A. Adams, The Genera of Recent Mollusca, vol. ii. p. 575, vol. iii. pi. cxxx. 

 fig. 3, 1858. 



Terebratula {Waldheimia) flavescens, L. Reeve, Monogr. of Terebratula, Conch. Icon. pis. 1 & 2, 

 fig. 1 a, b, 1860. 



Waldheimia australis, Huxley, An Introduction to the Classif. of Animals, p. 28, fig. 10, 1869. 



Waldheimia flavescens, Dall, Amer. Journ, of Conch, vol. vi. p. 108, 1870, and Proe. Acad. Nat. Sci. 

 Philadelphia, 1873, p. 181 ; Tenison Woods, Proe. Roy. Soc. of Tasmania, 1877, p. 57 ; Douville, Bull. 

 Soc. Geol. de France, 3« ser. pi. vii., 1879 ; Davidson, Report on the Brachiopoda, Voyage of H.]\I.S. 

 ' Challenger,' Zool. vol. i. p. 41, pi. iii. figs. 10-12, 1880; Zittel, Handbuch der Palaontologie, pp. 645 



SECOND SEKIES. — ZOOLOGY, VOL. IV. 6 



