470 Messrs. W. K. Parker and T. E,. Jones on the 



under various names. This is the B. bulloides, d'Orb., Ann. Sc. 

 Nat. vii. p. 297; Modeles, No. 90 ; also the Pyrgo lavis, Defrance, 

 Diet. Sc. Nat. Zool. pi. 88. f. 2, 2 a, 2 b. 



23. MiHolites Cor-anguinum. Ann. Mus. v. p. 251, No. 2 ; 

 ix. pi. 17. f. 3 a-c ; Hist. An. s. Vert. vii. p. 6] 2, No. 2. " Fos- 

 sil; Grignon" (and Fontenai-Saints-Peres, near Mantes, ac- 

 cording to Defrance, Diet. Sc. Nat. xxxi. p. 68). 



A well- developed form of Triloculina, of considerable size and 

 well grown. This is one of the most globular of the trigonal 

 varieties. It may be found in most warm seas, at no great 

 depth. It is common in the Tertiary deposits. 



One of Lamarck's figured specimens appears to be ornamented 

 with striae or with riblets. 



24. Miliolites trigonula. Ann. Mus. v. p. 351, No. 3; ix. 

 pi. 17. f. 4; Hist. An. s. Vert. vii. p. 612, No. 3; M. Cor- 

 anguinum, Tabl. Enc. Meth. pi. 469. f. 2 a, b, c. " Fossil ; 

 Grignon." 



This is the same as Triloculina Cor-anguinum, except that the 

 sides are less convex, the lobes or segments of sarcode being 

 thinner. It is represented by D'Orbigny's Model No. 93. 



Modified forms with flattened and even hollowed sides (such 

 as T. tricarinata, d'Orb. Modeles, No. 94) are frequently met 

 with. 



Besides the smooth varieties, there are many others of the 

 same shape, but having ribbed or pitted surfaces. 



As the T. trigonula is copied in the ' Tabl. Enc. Meth./ and 

 there termed T. Cor-anguinunij it is evident that Lamarck recog- 

 nized the close relationship of these two forms. 



25. Miliolites planulata. Ann. Mus. v. p. 352, No. 4 ; Hist. 

 An. s. Vert. vii. p. 613, No. 4. Three varieties. " Var. a, fossil, 

 from Louvres, near Paris : /3, fossil, Grignon ; recent, Corsica : 

 7, fossil, Grignon." (A larger variety from near Hesse-Cassel, 

 according to Defrance, Diet. Sc. Nat.) 



Three forms of Spiroloculina, common in the recent and fossil 

 state. Var. a is more flattened than {3 ; and 7 is still thinner, 

 and is keeled. The last is one of the most attenuated of the 

 Spiroloculina. 



S. planulata is the oldest trivial name given to any form of this 

 supposed genus. We have here the same shell as the S. depressa, 

 D'Orb. 



26. Miliolites saxorum. Ann. Mus. v. p. 352, No. 5 ; ix. pi. 17. 

 f. 2 ; Tabl. Enc. Meth. pi. 469. f. 3 a, b, c*. " Fossil; Mont 

 Rouge, near Paris." 



This is a Quinqueloculina, of a peculiar habit. D'Orbigny 



* Fig. 3 c is the M. opposita, Lam. Ann. Mus. v. p. 353 ; but it is (pro- 

 bably quite correctly) here collocated with M. saxorum, D'Orb. 



