136 GOÉS, RETICULARIAN RHIZOPODA OF THE CAEIBBEAN SEA. 



Trochammina iiicerta dOrb. 



Tab. XI, figg. 404--405. 



This form is one of the smoothest amongst the arenaceous group of this class, 

 being composed of the finest siliceous particles and probably a large quantity of se- 

 creted or precipitated cementing siliceous niatter, the lime being quite absent; a rusty 

 colouring matter renders the sbell yellowish brown. It is very regularly formed, some- 

 what biconcave. The aperture is a very narrow crescent placed on the inner part of 

 the last convolution. It is sparsedly met with on the chalk-bottom, attaining a dia- 

 meter of 2 to 3 m. m. 



Fig. 404: side-view of Trochammina incerta. 



Fio-. 405 : edge-view. 



Syn. Opereulina incerta d'Orb., 1839, Cuba, p. 49, t. 6, figg. 16 — 17. 



» cretacea Rss., 1845, Böhra. Kreide 1, p. 35, t. 13, figg. 64 — 65 (sec. Park. et 



Jones). 

 ? « punctata Ess., 1849, Neue Foramf. östen-, tert. Beckeii; Wien. Ak. Dkschr. 1. i, 



p. 370, t. 46, fig. 21. 

 Orbis inflmus Strickland, 1846, Microsc. Sliells found in the Lias; Qu. Jouin. geol. Soc. 2 



p. 30, fig. a. 



Spirillina arenaeea Wtlliams., 1858, Brit. rec. for. p. 93, fig. 203. 



Troehamnina scLuamata var. incerta Carp., 1860, Introduot. p. 141, 312, t. 11, fig. 2. 



a incerta Park. et Jones, 1869, The perm. Troch. pusilla etc.; A. M. N. H. (4) 4, 



p. 388, t. 13, fig. 1. 

 » » Brady, 1876, Carbonif. and Perm. foramf.; Pal. Soc. 30, p. 71, t. 2, 



figg. 10—14. 

 Ammodiseus Rss., 1861, Entwurf einer systematischen Zusammenstellung etc; Wien. Åk. 



Sitz.-Ber. 44, p. 365. 

 Serpula Roesleri Schmid, 1867, Leonh. u. Broun. Jhrb. 1867, p. 583, t. 6, figg. 46 — 47. 



Ammodiseus inflmus Bornem., 1874, Ueber Involutina; Zeitschr. deutsch. geol. Ges. 26, p. 725, 



t. 8, figg. 4—7; t. 9, fig. 8. 

 » miocenicus Kärr., 1877, Hochquellenwasserleitung; Österr. geol. Reichsanst. Abh. 9, 



p. 372, t. 10, fig. 2. 

 PCornuspira Hörnesi Kaiir., 1865, Wien. Sandsteiu.; Wien. Ak.'Sitz.-Ber. 52, p. 495, figg. 10 — 11. 



» granulosa, infraoolithica, silicea, aspera Terödem. (sec. Brady 1. cit. p. 72). 



» oolithiea Schwag., 1867 (sec. Brady 1. cit. p. 72). 



» infima Blake, 1876, Yorkshire Lias p. 451, t. 18, fig. 2. 



(Vide etiara Brady, Carbonif. and Perm. foramf.; Pal. Soc. 30, p. 71 — 72) 



Litiiolina scorpiurus Mtfet. 



Tab. XI, figg. 406—409. 



A great deal of confusion has been brought into the designation and definition 

 of the genus Lituolina; and of late the dissociation of its closely allied forms even 

 into new genera, based upon very trifling and inconstant characters, has scarcely con- 

 tributed to advance our knowledge as to the real relation between its different forms 



