On Mierozoa, &c By C. B. Sim-born & F. Chapman, 753 



ribbed, and its upper chambers decorated with minute prickles and 

 burs. In transverse section all specimens vary from nearly circular 

 to a long oval ; and many of them have a more or less serrated keel. 

 Remarking all these differences, we cannot refrain from calling 

 the student's attention to the undermentioned figures as a few of 

 the forms shown under different names. All these we prefer to 

 regard as belonging to this variety, for we can closely match them 

 amongst the specimens collected by us from the Piccadilly clay. 



CristeUaria decorata Eeuss, Z. d. geol. Ges., 1855, vii. plate viii. 

 fig. 10; plate is. fig. 2. Marginulina fragraria ; M. (Crist.) 

 aspenda, C. cumidicostata Giimbel, Abh. k. Ak. Wiss. Wien, 1868, 

 x. plate i. figs. 58, 65, 67. C. arcuata Phil. ; C. gladius Phil. ; 

 C. fragraria Giimb., Yon Hantken, Mitth. k. ung. geol. Anst., 

 1875, iv. plate v. figs. 10 and 12; plate vi. figs. J, 2, and 3. — 

 Sowerby, in Wetherell's paper (op. cit., fig. 12), figures this variety ; 

 and an elongate specimen occurs in plate cxiv. fig. 14 of Brady's 

 ' Challenger ' Monograph. Although it was mentioned in Morris's 

 Catalogue as above quoted, its relation to other forms was first 

 described by Parker and Jones, 1859, Ann. and Mag. Nat. Hist., 

 ser. 3, iv. p. 350. This is very common in both clays at Piccadilly, 

 and also occurs at Chelsea. 



Vaginulina d'Orbigny [1826]. 



Vagimdina legumen (Linne) var., plate XV. fig. 19a, b. 

 Nautilus legumen Linne, Syst. Mat., 12th ed., p. 1164, fig. 288. 

 Test smooth, much compressed, of six rapidly increasing chambers. 

 One specimen ; brown clay. 



Cristellaria Laniarck [1816]. 



CristeUaria obtorta Terquem and Piette, plate XV. fig. 20a. b. 

 Terqueni, 1860-1, Mem. Acad. Imp. Metz. xlii. Ann. p. 459, 

 plate vi. fig. 20. — A very rare form of CristeUaria, nearly straight, 

 recorded by Terquem from the Lias of the Department Moselle. 

 The figure referred to has more chambers than ours, and does not 

 show any trace of the spiral ; but we do not consider it necessary 

 to divide them. One specimen ; brown clay. 



CristeUaria crepidula (Fichtel and Moll), plate XV. fig. 21. 

 Nautilus erepidula Fichtel and Moll, 1803, Test. Microsc, p. 107, 

 plate xix. tigs. g-i. — An elongate, erect, and compressed form, 

 eminently characteristic of Jurassic deposits, and subject to great 

 variety. One specimen ; brown clay. 



CristeUaria aeatauricularis (Fichtel and Moll), plate XV. 

 fig. 22a, b. Nautilus acutauricularis Fichtel and Moll, 1803, Test, 

 Microsc, p. 102, plate xviii. figs. g-i. — A small, smooth form, well 

 figured in Brady's 'Challenger' Monograph, plate cxiv. fig. 17. 

 ( ino specimen ; brown clay. 



Ser. 2.— Vol. VI. 3 D 



