84 GOiiS, TPIE RETICULARIAN RHIZOPODA OF THE CARIBBEAN SEA. 



It is scarce in the coralline-gravel. y>Tritaxia'» 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.)- Röm., 1838, Nordd. tert. Meeress.; Leonh. u. Bronn. Jhrb. 1838, 



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

 Ess., 1845, Bohm. Kreide 1, p. ,S9, t. 13, fig. 77. 

 Verneuilina Miinsteri Ess., 1854, Kreide Ostalp.; Wien. Ak. Dkschr. 7, p. 71, t. 26, fig. 5. 



>i Bronni Kss., 1845, Bohm. Kreide 1, p. 38, t. 12, fig. 5; 1855, Kreidera. Lemberg; 



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

 j) tricarinata d'Orb., 1839, Por. Craie bl. Paris; Mem. Soo. géol. Prance 4. p. 39, 



t. 4, figg. 3—4. 

 » » d'Orb., 1846, Por. Bass. tert. Vienne p. 182, t. 21, figg. 26—27. 



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



t. 1, fig. 2. 

 » eognata liss., 1864, Oberoligocäu.; Wien. Ak. Sitz.-Ber. 1. 50, p. 448, t. 1, fig. 1. 



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



fig. 12. 

 » » Eggek, 1857, Miocän. v. Ortenburg; Leonh. u. Bronn. Jhrb. 1857, p. 292, 



t. 9, figg. 17—18. 

 » eretacea Kärr., 1870, Kreidef. in Leitzerdorf; Jhrb. k. k. österr. geol. Reichsanst. 20, 



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

 PTextularia atlantica Bailey, 1850, Examin. of Soundings; Sraithson. Coutrib. of knowledge 2, 



Art. 3, p. 12, figg. 38—43. 

 Grammost. aeuleatum Ehrenb., 1854, Microgeol. t. 28, fig. 17. 



b) forma Tritaxia (Bigenerinae ineipienti aequalis): 



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



Uvigerina tricarinata d'Orb., 1839, For. Craie bl. Par.; Mem. Soc. geol. Fr. (2) 4, p. 42, t. 4, 



figg. 16 —17. 

 Tritaxia pyramidata Rss., 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. i, p. 41, t. 4, fig. 3. 



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



figg. 1-2. 

 » foveolata, minuta Maess., 1877, Riigen. Schreibekr.; Greifsw. Nat. Verein. Mitth. 1877 — 78, 



p. 161, t. 3, figg. 30—31. 

 P » ulmensis Gijmb., 1871, Ulraer Cement. Mergel; Miinch. 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 (Munst.) Röm., 1838, Nordd. tert. Meeress.; Leonh. u. Bronn. Jhrb. 1838, 



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

 » elegans Karr., 1865, Por. Griinsandst. N. Zeeland; Novara Reise, geol. Th. 1. 2, 



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



