Nomenclature of the Foraminifera. 349 



men of Cristellaria Calcar is figured in the ' Supplement' under 

 this name, from the "Boysian Cabinet/' In this variety the 

 umbo has encroached upon the limbated septal lines ; but there 

 is nothing to render this variety essentially distinct from those 

 shown in pi. 15. f. 4, and pi. 18. fig. 9. Without doubt this 

 specimen, which has its last chamber broken, was fossil. It is 

 the C. Wetherellii, Jones, Quart. Journ. Geol. Soc. vol. viii. 

 p. 267. 



The N. lavigatulus of Walker (fig. 67) is a recent typical C. 

 Calcar. Montagu appears to have had some difficulty in recog- 

 nizing Walker's specimen, though in the ' Supplement' (p. 75) 

 he intimates that his N. Calcar and Walker s N. Icuvigatulus 

 " have been generally confounded." 



(J. c.) P. 190, and Supplem. pi. 18. f. 9, p. 78. "Nautilus 

 depressulus," At p. 190, Walker's fig. 68 is referred to, and 

 his description given, of a Nonionina ; but in the * Supplement ' 

 a small keelless Cristellaria Calcar^ probably recent, is figured 

 and described. This has no relation whatever with the Nautilus 

 depressulus of Walker. (See above, p. 339.) 



Those who have followed Montagu's nomenclature have been 

 led into the same mistake ; and we necessarily consider that in 

 Prof. Williamson's ' Monograph,' p. 25, " Nautilus depressulus, 

 Adams, 1798, N. depressulus, Turton, N. depressulus, Mont. 

 Suppl. p. 78, N. depressulus. Pennant," &c., should be erased 

 from the synonyma of C. Calcar. 



Maton and Rackett gave the name of N. rotatus to Montagu's 

 fig. 4. pi. 15. In Wood's ' Index Test.' (pi. 13. fig. 5) a variety 

 of Rotalia Partschiana, D'Orb., is represented under Maton and 

 Rackett's name. The lower face of this Rutalia (shown in the 

 figure referred to) closely resembles a Cristellaria. Wood's " N. 

 rotatus " should also, therefore, be removed from the synonyma 

 of C. Calcar. 



(J. d.) Suppl. pi. 19. f. 1, p. 80. "Nautilus subarcuatulus." 

 The Marginuline form of Cristellaria Calcar. It was from "the 

 Boysian cabinet ;" and as this collection contained specimens 

 from various parts of the Kentish coast, it is quite probable that 

 we have here a fossil shell from the Thanet Sands, in which this 

 form is not uncommon*. In the ^Test. Brit.,' p. 196, " N. sub- 

 arcuatulus" is placed as a synonym under "N. Semilituus." 



(J. e.) P. 196, and Suppl. pi. 19. f. 3. p. 80. " Nautilus Semi- 

 lituus." At p. 196, Walker's fig. 73 is referred to, and his de- 

 scription of N. suharcuatulus given under the name of " N. Semi- 

 lituus, Gmel.,'' which is a misnomer, as mentioned in Ann. N.H. 

 1859, iii. p. 480. In the ' Supplement,' however, a difi'erent shell 



* Quart. Journ. Geol. Soc. vol. viii. p. 2&7' 



