84 GOES, THE RETICULARIAN RHIZOPODA OF THE CARIBBEAN SEA. 



It is scarce in the coralline-gravel. tTrtiama* Rss. is nothing but an incipient 

 Bigenerina of Text, triquetra. This developed form occurs also in the coralline-gravel. 

 It is generally twice as large as the Verneuilina stage of the fully developed Bigene- 

 rina form. 



Fig. 183: represents the flat side of Text, triquetra. 



Fig. 184: the apertural side. 



Syn. Textularia triquetra (v. MUNST.). ROM., 1838, Nordd. tert. Mceress.; Leonh. u. Bronn. Jhrb. 1838, 



p. 384, t. 3, fig. 19. 



Rss., 1845, Bohm. Kreide 1, p. 39, t. 13, fig. 77. 

 Verneuilina Munsteri Rss., 1854, Kreide Ostalp.; Wien. Ak. Dkschr. 7, p. 71, t. 20, fig. 5. 



Bronni Rss., 1845, Bohra. Kreide 1, p. 38, t. 12, fig. 5; 1855, Kreidera. Lemberg; 



Haid. Nat. Abh. 4. 1, p. 40, t. 4, fig. 2. 

 tricarinata D'ORB., 1839, For. Craic bl. Paris; Mem. Soc. geol. France 4. p. 39, 



t. 4, figg. 34. 



D'ORB., 1846, For. Bass. tert. Vienne p. 182, t. 21, figg. 2627. 



oberburgensis Rss., 1863, Oberb. in Steiermark; Wien. Ak. Dkschr. 1. 23. i, p. 6, 



t. 1, fig. 2. 



cognata Rss., 1864, Oberoligociin.; Wien. Ak. Sitz.-Ber. 1. 50, p. 448, t. 1, fig. 1. 



spinulosa Ess., 1849, Neue For. Wien. Beck.; Wien. Ak. Dkschr. 1. i, p. 374, t. 47, 



fig. 12. 

 EGGER, 1857, Miocan. v. Ortenburg; Leonh. u. Bronn. Jhrb. 1857, p. 292, 



t. 9, figg. 1718. 

 cretacea KARR., 1870, Kreidef. in Leitzerdorf; Jhrb. k. k. osterr. geol. Reichsanst. 20, 



p. 164, t. 10, fig. 1. 

 PTextularia atlantica BAILEY, 1850, Examin. of Soundings; Sraithson. Contrib. of knowledge 2, 



Art. 3, p. 12, figg. 3843. 

 Grammost. aculeatum EHRENB., 1854, Microgeol. t. 28, fig. 17. 



b) forma Tritaxise (Bigenerinre incipient! sequalis): 



Textularia tricarinata Rss., 1845, Bohm. Kreide 1, p. 39, t. 8, fig. 60. 



Uvigerina tricarinata I/ORB., 1839, For. Craie bl. Par.; Mem. Soc. geol. Fr. (2) 4, p. 42, t. 4, 



figg. 16-17. 

 Tritaxia pyramidata Ess., 1862, Nordd. Hils u. Gault; Wien. Ak. Sitz.-Ber. 1. 46, p. 32, t. 1, 



fig. 9. 



Verneuilina dubia Rss., 1854, Kreidemerg. Lemberg; Haid. Nat. Abh. 4. 1, p. 41, t. 4, fig. 3. 



Tritaxia tricarinata Ess., 1859, Westphal. Kreidef.; Wien. Ak. Sitz.-Ber. 40, p. 228, t. 12, 



figg. 1-2. 

 foveolata, minuta MARSS., 1877, Riigen. Schreibekr.; Greifsw. Nat. Verein. Mitth. 1877 78, 



p. 161, t. 3, figg. 3031. 

 P ulmonsis GUMB., 1871, Ulmer Cement. Mergel; Munch. Ak. Sitz.-Ber. 1, p. 63, t. 1, 



fig. 2. 



c) forma Bigenerina completa: 



Verneuilina communis PARK, and JONES, 1866, Crag. For.; Pal. Soc. 19, t. 3, fig. 19. 

 Clavulina irregularis (MiiNST.) ROM., 1838, Nordd. tert. Meeress.; Leonh. u. Bronn. Jhrb. 1838, 



p. 387. t. 3, fig. 40. 



elegans KARR., 1865, For. Griinsandst. N. Zeeland; Novara Reise, geol. Th. 1. 2, 



p. 80, t. 16. fig. 11. 



