DR. T. DAVIDSON ON llECENT BRACHIOPODA. Gl 



the larger branches of the great sinuses The ova were visible in all stages of 



growth. Those floating free in the lacunes were nearly spherical, and of a flesh-colour ; 

 their substance seemed of a granular consistency, due perhaps to the action of the spirit 

 in which they were preserved. The immature ova were pyriforin, attached to the ovary 



by their pointed ends No sperraatophora; or spermatozoa were observed in any 



of the specimens examined. The oviducts are situated as in IV. aiistralis. The lining- 

 membrane of their trumpet-shaped portion was drawn into tiiin plicie. Their apices 



were teat-shaped, with very small oriflces The setae are very slender and tine, 



irregularly marked with transverse lines, but smoother towards their outer ends. They 



protrude from their follicles, hardly more than one third of their length The 



mantle edge was brownish and seemed to have a slightly villous epithelium." 



I have reproduced this long extract from Mr. Dall's admirable memoir, as I have done 

 in similar cases from the works of other authors, because all that relates to the animal of 

 different species of the same genus is of the utmost importance. The animals of species 

 of the same genus no douljt agree in their general character, but often differ considerably 

 in their respective details, and these differences should always, when possible, be carefully 

 noted. The animal of every species should also under favourable circumstances be 

 anatomically examined and described. 



In his " Contributions to the Fauna of the Gulf Stream at great Depths " (Bull. Mus. 

 Comp. Zool. vol. i. p. 127), Count L. T. de Pourtales informs us, in his description 

 of Waldheimiafloridana, i\vd.i " Very young specimens are flatter, rounder, and have a 

 straight margin ; they could scarcely be distinguished from the young of Terebratulu 

 cubensis, if it was not for the loop and septum seen by transparency. There is also some 

 variety of form in tlie old; in some specimens the length is greater than the breadth, 



and there is considerable diversity in the sinuosity of the frontal margin It is 



always associated with Terebratula cubensis, the latter being still more common (in the 

 proportion of about three to one), and making its first appearance in 100 fathoms."" 



34. Waldueimia (Macandrevia) cranium, Miiller, sp. (Plate XII. tigs. 11-23 ; Plate 

 XIII. figs. 1, 2.) 



Terebratula cranium, Miiller, Zool. Danica; Prodronius, p. 249, no. 3U0(J, 177G. 



Anomia vitrea, Cliciuuitz ? (not Born), Conch. -Cub. vol. viii. p. 97, t. 78. figs. 707 & 709, 179.'). 



Terebratula cranium, Moutagu, Trans. Liun. Soc. vol. xi. p. 188, tab. xiii. fig. 2, 1811 ; Turtou, Conch. 

 Diet, of British Isle.s, 1819. 



Terebratula vitrea, Fleming (not Born), Phil, of Zool. vol. ii. p. 498, pi. iv. fig. 4, 1822 ; Schumacher 

 (not Born), Essai iriai nouveau Systeme des Hab. des Vers Testaees, p. l;3;3, pi. ix. fig. 1, 1817. 



Terebratula eutlnjru, Philippi, Enum. Moll. Siciliie, vol. ii. p. 68, tab. xviii. fig. 8, 1814. 



Terebratula cranium, C. B. Sowerby, Thes. Conch, vol. i. p. 354, pi. Ixx. figs. 60-G2, 18 10 ; Loven, Index 

 Moll. Scandinaviie, (Efvers. K. Vet.-Akad. Forh. p. 183, 1846 ; Davidson, IMonogr. Brit. Foss. Bracli. Ter- 

 tiary Species, vol. i. pi. i. fig. 8, 1852, and Ann. & Mag. Nat. Hist. 2ud ser. vol. xvi. pi. x. fig. 8, 1855. 



Terebratula (jlabra, Ijcaeli, Brit. j\Ioll. p. 359, pi. xiv. figs. 3, 4, 5, 1852. 



Terebratula subvitrea, Leach {teste Reeve). 



Waldheimia cranium, Barrett, Report Brit. Assoc. Glasgow, 1855, p. 107 ; Hancock, Phil. Trans. Roy. 

 Soc. vol. cxlviii. 1858; Suess, Ueber die Wohnsitze der Brachiopodcn, Sitzungsb. k. Akad. Wissensch. 

 Wien, p. 200, 1859. 



