830 



SYSTEMATIC mSTORY OF THE INFFSOEIA, 



C. crassiis (Bail.). — Disc without a 

 central star, covered ^\dth iiiteiTiiptecUy 

 radiant lines of large, prominent, hex- 

 agonal cellules wdth circidar pores ', cel- 

 lules somewhat larger near the maro;in. 



B. Amer. Jom-n. Science, 1856. Alive, 

 Sea of Kamtschatka ; fossil, Monterey. 



C. profundus (E.). — Cellules of disc 

 subequal, near the margin smaller and 

 irregidarlv radiating. ERBA.1854j EM. 

 pi. 35 B. f. 8. Atlantic. 



C. radiatus (E.). — Cellules rather 

 large, arranged in radiating lines (EM. 

 pi. 21. f. 1; SBD. pi. 3. f. 37), smaller 

 near the margin, (xi. 39, 40.) Common, 

 both recent and fossil. Diam. 1-860" to 

 1-240". The radiating arrangement is 

 sometimes obscure. 



C. Sol (WaUich).— Disc as in C. radi- 

 atus, but surrounded by a broad, hyaline, 

 membranous border, which is divided 

 into compartments bv numerous radiating 

 lines. Wallich, TMS. viii. pi. 2. f. 1, 2. 

 From Salpae, Bay of Bengal, and Indian 

 Ocean. On subjecting the frustule to 

 acids, the membranous ring is at first 

 simply detached, and after a while dis- 

 solved (WaUich). 



C. Argus (E.). — CeUides large, some- 

 what smaller at the centre and margin j 

 the radiating aiTangement often inter- 

 rupted. EM. pi. 21. f. 2. Eecent, Cux- 

 haven ; fossil, Oran and Sicily. May be 

 a variety of C. radiatus, from which, how- 

 ever, Mr. Brightwell considers it suffi- 

 ciently distinct. He finds the cellules 

 in that species always radiant, whilst 

 in the present they have no definite 

 an*angement. 



C. radiolatus (E.). — Granules puncti- 

 form, equal, radiating. E. /. c. pi. 18. 

 f. 36. Fossil, Virginia. Differs from 



C. Apollinis bv the absence of an um- 

 bilicus. 18 ceUules in 1-1200". 



C. suhtiUs (E.). — Granules punctiform, 

 small, equal, radiating. E. /. c. pi. 18. 

 f. 35. America. Similar to C. radiolatus, 

 but with 24 cellules in 1-1200". 



C. Normaimi (Greg.). — Disc with ra- 

 diating series of faint areolae arranged 

 in fasciculi of about 6 rows each ; areolae 

 equal, except near the margin, where 

 they are smaller; rim smooth. Grev 

 MJ. vii. p. 81, pi. 6. f. 3. In stomach of 

 Ascidians. Hull. Areolae about 24 in 

 •001". No distinct umbilicus. Differs 

 from C. subtilis by having only half as 

 many lines in each fascicidus (Grev.). 



C. punctafus (E.). — Cellules puncti- 

 fonn, radiating, loosely disposed at the 

 centre, very densely crowded at the 

 margin, and forming a broad, yellowish- 



white border, 

 ; p. 124 



Vii'ginia. 



EM. pi. 18. f. 41 ; KSA. 



Collides at centre, 

 24 to 26 in 1-1200". Diam. 1-348". 

 j Ehrenberg gives a figm'e of an oval 

 I variety of this species, pi. 18. f. 40. 

 j C. ienellus (E.). — Cellules very small, 

 equal, radiating. EB. 1854. Atlantic. 

 j 17 or 18 ceUules in 1-1200". The cha- 

 j racters given are insufficient to distin- 

 I guish this species fi'om C. radiolatus and 

 j C. subtilis. 



I C. gramdatus (E.). — Disc small, with 

 I dense series of very small cellules, caus- 

 ing a gTanidar appearance ; granides 18 

 to 21 in 1-1152". KSA. p. 122. FossU. 

 Virginia. Diam. 1-552". 



C. umhonatus (Greg.). — Disc densely 

 cellulate, ha\'ing a broad, nearly flat 

 marginal zone, the central portion being 

 nearly or quite hemispherical ; cellules 

 generally radiant, small and irregular in 

 outline. Diam. -0045". Lamlash Bay. 

 GD. p. 28, pi. 2. f. 48. 



5 * CeUules tiot radiating ; no distinct 

 wnhilicus or striated border, 



t Cellules aiTanged in more or less 

 perfect concentric circles. 



C. Patina (E.). — Disc large, with 

 moderate-sized cellules, disposed in 

 concentric circles and becoming smaller 

 towards the margin. KB. p. 1. f. 15. 

 Fossil, Greece; alive, Cuxhaven. The 

 young and vigorous specimens of live 

 indiAdduals are completely filled with 

 yellow granides, whilst the older ones 

 have an in-egular -s'ellow granular mass 

 within them. Diam. 1-860" to 1-240". 



C. isojjorus (E.). — Disc coarsely cel- 

 lular; cellules close, arranged in con- 

 centric circles. EM. pi. 33. 17. f. 3. 

 Disc of moderate size. Ehrenberg's 

 figure bears some resemblance to C. con- 

 cavus, but has concentric ceUides, and no 

 distinct rim. 



C. velatus (E. ). — Cellules large, an- 

 gidar, rather distant, arranged somewhat 

 concentrically; the disc punctated, ap- 

 pearing as if "^covered with a veil. E. /. c. 

 pi. 18. f. 37. Virginia. Diam. 1-492". 



2 1 Cellules in parallel or cur\'ed lines. 



C. lineatus (E.). — Cellules small, cir- 

 cular, arranged in straight, parallel lines. 

 KB. pi. 1. f. 10. Fossil, Sicily and Ame- 

 rica; alive, Cuxhaven. Common. The 

 cells in this species form parallel lines in 

 whatever direction they may be viewed. 

 In large and well-preserved fossil speci- 

 mens as many as twenty-five openings 

 (? spines) were seen near the circum- 



