86 



Yalvuliiia trianguljiris dOrb., forma Clavulina aiigularis dOrb. 



Tab. XI, %. 387—389. 



Our form seems to be identical with Clavulina tricarinata d'Orb. from the West- 

 Indies; but it is iniich larger, sometimes attaining 3 mm. in length. The trigonal cir- 

 cumference is not at all a constant feature in this form, for Clavulina nodosaria d'Oeb. 

 from the same locality is nnquestionably a Valvulina but of cylindrical shape and not 

 distinct from the tricarinate form. 



I am far from being able with any satisfactoiy degree of certainty to identify all 

 of d'Orbigny's Clavulina species, but most of thera display an arrangement of their 3 or 

 4 serial stage more in accordance with the plan of growth of Valvulina than of the more 

 regular type of Text. triquetra. In our form the septal impressions are ordinarily very 

 strongly marked, particularly on the flat sides, where they become changed into broad 

 semilunar transverse furrows. The angles of the chambers are often somewhat pro- 

 duced. The shell-substancc is finely agglutinated of chalk-raatter. It is not common 

 in the coralline-gravel. 



Fig. 387: the edge side; 389: the flat side; 389: the aperture. 



a) rotaliseformis, plus minus ve oouica: 



Syu. Valvulina triangularis d'Orb., 1826, Tab. meth.; An. Se. Nat. 7, p. 270. Mod. N:o 25. 

 » » Fki«'s Mod. ISf:o 5. 



» » Park. and Jones, 1857, For. Coast. of Nonvay; An. Mag. Nat. Hist. (2) 19, 



p. 209, t. 11, figg. 15—16. 

 1) » Carpentee, 1860, Introd. t. 11, ligg. 15 — 16. 



Rotalina fusca Williams., 1858, Brit. reo. förf. p. 55, figg. 114 — 115 (see. Carpenter). 



Valvulina austriaca d'Orb., 1846, For. Bass. tert. p. 181, t. 11, figg. 7 — 8. 



« triangularis var. coniea Park. and Jones, 1865, North. Atl. and Aret. Oc; Phil. Träns. 



155. 1, p. 406, t. 15, fig. 27. 

 ? « allomorphinoidea Ess., 1859, Westph. Kreidef.; Wien. Ak. Sitz.-Ber. 40, p. 223, t. 11, 



fig. 6. 

 ? » tauUoides Brady, 1876, Carbonif. and Perm. foramf.; Pal. Soc. 30, p, 89, t. 4, figg. 



12—15. 

 ? o plicata Brady, ibid. p. 88, t. 4, fig. 10. 



? » rudis Brady, ibid. p. 90, t 3, figg. 19—20. 



b) buliminiieformis: 



Carpent., Introd. t. 11, figg. 19, 25. 

 Valvulina gibbosa d'Orb., 1839, For. Craie blane. Par.; Mem. Soc. géol. Pr. 4, p. 38, t. 4, 



figg. 1—2. 

 » parvula v. Munst., globularis v. Munst. 1838, Röm., Tert. Meeress. N. Deutschl.; Leonli. 



u. Bronn. Jhrb. 1838, p. 387, t. 3, figg. 41—42. 

 » Oviedoana d'Orb., 1839, Cuba p. 103, t. 2, figg. 21—22. 



» spieula Ess., 1845, Böhra. Kreide 1, p. 37, t. 13, fig. 69. 



