436 Messrs. W. K. Parker and T. R. Jones on the 



bigny here unites their two varieties of P. macella. These are 

 all more or less compressed forms of P. a'ispa. Ann. N. H. 

 ser. 3. V. p. 105. 



45. Quinquelocuhna birostris, XamarcA;, sp. Page 301, no. 2. 

 A feeble variety of Miliola {Saxorum?). Ann. N. H. ser. 3. v. 

 p. 471. 



46. Quinqueloculina Saxorum, ZflmarcA, sp. Page 301, no. 1, 

 pi. 16. f. 10-14. Modele no. 33. A peculiar Miliola, a link with 

 the subgroup Hauerina. Ann. N. H. ser. 3. v. p. 470. 



47. Quinqueloculina Seminulum, Linn. sp. Page 303, no. 44. 

 The typical Miliola. Ann. N. H. ser. iii. p. 480. 



48. Quinqueloculina sub rotunda, Montagu, sp. Page 302, 

 no. 36. A feeble variety of Miliola Seminulum, Linn. sp. Ann. 

 N. H. ser. 3. iv. pp. 336, 344. 



49. Hobulina Calcar, Linn. sp. Page 289, no. 12. Robulina 

 is the same as Cristellaria with a triangular aperture — an unim- 

 portant variable feature. C. Calcar is a well-developed sym- 

 metrical form, with a more or less dentate keel, and typifies the 

 Cristellarian subgroup of the genus Nodosarina. Ann. N. H. 

 ser. 3. iii. p. 476 j v. p. 112; & vi. p. 343. 



50. Robulina costata, F. & M. sp. Page 289, no. 13. An 

 important subvariety of Cristellaria Calcar. Ann. N. H. ser. 3. 

 iii. p. 113. 



51. Robulina cultrata, Montf. sp. Page 287, no. 1. Modele 

 no. 82. This is one of the most common of the whole-keeled 

 varieties of the Nautiloid Cristellaria? : it often has a triangular 

 aperture; but this is a feature of extreme variability, and in- 

 sufficient for the diiFerentiation of Robulina from Cristellaria. 

 The keel itself, also, is a variable feature, sometimes reduced to 

 a minimum. Ann. N. H. ser. 3. v. p. 112; & vi. p. 343. 



52. Robulina Vortex, F. & M. sp. Page 288, no. 4. Cris- 

 tellaria Vortex (Ann. N. H. ser. 3. v. p. 113) : its chambers are 

 very narrow and much curved. 



53. Rotalia trochidiformis, Z(fl7nfl;-c^. Page 272, no. 1. This 

 is Discorhina Turbo, D'Orb. sp., var. trochidiformis. See Ann. 

 N. H. ser. 3. v. p. 294; and Carpenter's ' Introd. Foram.' p. 204, 



54. Rotalia (Turbinulina) Beccarii, Linn. sp. Page 275, no. 42. 

 Modele no. 74. The common Rotalia Beccarii, Linn. sp. This 

 is the same as D'Orbigny's Turbinulina tortuosa [loc. cit. no. 40), 

 for which name he erroneously quotes Fischer as the authority. 

 G. Fischer de Waldheim, in the ' Mem. Soc. Nat. Moscou,' 1817, 

 vol. V. p. 449, pi. 13. f. 5 a, b, and in his ' Adversaria Zoologica'*, 

 p. 75, amongst his " Cephalopoda conchylifera," has " Streblus 

 (u aTpe^Xo'i, tortuosus), tab. 13 [pi. iii.] . fig. 5, a b," and pro- 



* Fasc. I. et II. (Ex parte ex Actis Soc. Nat. Scrut. extractus.) Cum vii. 

 tabulis aeueis. Mosquae, 1819. 



