REPORT ON THE FORAMINIFERA. 
551 
others in the Mediterranean, Adriatic, and elsewhere. Small specimens, with very 
narrow keel, have occasionally been dredged in shallow water in the British seas. 
The earliest known fossil specimens are those from the Lias. The species occurs in 
Tertiary deposits of almost every geological age. 
Cristellaria calcar, Linne, sp. (PI. LXX. figs. 9-15). 
“Nautilus minimus non umbilicatus,” Gaultieri, 1742, Index Test., pi. xix. fig. C. 
“Nautili (Lenticulce radicrfce),” Soldani, 1789, Testaceograpliia, vol. i. pt. 1, p. 54, pi. xxxiii. 
figs, aa, bb. — “Nautili carinati ( Lenticulce ),” Ibid., p. 64, pi. lxviii. figs, hit, mm. 
Nautilus calcar, Linn6, 1767, Syst. Nat., 12th ed., p. 1162, No. 272 ; — 1788, Ibid., 13th 
(Gmelin’s) ed., p. 3370, No. 2. 
„ „ var. a, e, S, k, p . , Fichtel and Moll, 1803, Test. Micr., p. 69, pi. xi. figs, a.b.; 
pi. xii. figs, a.b.c. ; i.h., pi. xiii. figs. c.d. ; h.i. 
Anterior diaphaneus , Montfort, 1808, Conchyl. Syst., vol. i. p. 71, genre 18 e . 
Clisiphontes calcar, Id. Ibid. p. 227, genre 57 e . 
llerion rostratus, Id. Ibid. p. 231, genre 58 e . 
Rhinocurus araneosus, Id. Ibid. p. 235, genre 59 e . 
Lenticulina diaphanea, Blainville, 1825, Man. de Malacol., p. 390. 
,, araneosa, Id. Ibid. p. 390. 
„ calcar, Id. Ibid. p. 390. 
,, rostrata, Id. Ibid. p. 390. 
Robulina aculeata, d’Orbigny, 1826, Ann. Sei. Nat., vol. vii. p. 289, No. 14. 
,, radiata, Id. Ibid. p. 288, No. 7. 
„ pulcliella, Id. Ibid. p. 288, No. 8. 
„ calcar, Id. 1846, For. Foss. Vien., p. 99, pi. iv. figs. 18-20. 
Cristellaria calcar, Parker, Jones, and Brady, 1871, Ann. and Mag. Nat. Hist., ser. 4, vol. viii. 
pp. 241, 242, pi. x. figs. 91, 93, 94. 
The name Nautilus calcar was assigned by Linnd to the entire group of helicoid 
CristellaricB, and, as might be expected, the illustrations of the species selected by him 
from the works of earlier writers, include a number of forms now regarded as varietally 
if not specifically distinct. The drawings referred to all represent Cristellarice of the 
involute type, but they differ from each other in general conformation, as well as in details 
of structure. In some, the test is compressed and the peripheral edge is thick and rounded ; 
in others, the general form is lenticular and the margin angular and sharp ; whilst the 
remainder are characterised by a thin carinate periphery armed with short radiating spines. 1 
1 The figures referred to in the 13th (Gmelin’s) edition of the “Systema Naturae,” vol. i., part 6, p. 3370, are as 
follows : — 
Plancus, Conch. Min., pi. i. figs. 3, 4. 
Gaultieri, Index Test. Conch., pi. xix. figs. B. C. 
Ledermiiller, Amus. Micros., pi. viii. figs. c.d. 
Martini, Conchyl. Cabinet, pi. xix. figs. 168, 169 ; — 
and of these Ledermuller’s are copied from Plancus, and Martini’s from Gaultieri. 
Only two out of the eight figures above enumerated represent calcarate shells ; therefore Williamson’s use of the 
term “ Cristellaria calcar, typica ” (Bee. For. Gt. Br., p. 27, pi. ii. figs. 52, 53), for a non-spinous and non-carinate form, 
would have been quite in order, had not the name been employed in the interim by other authors in its present restricted 
sense. 
