178 



A. somewhat similar, but much smaller, valve is C. Kinheri Pant. (Ill PI. II f. 30; 1893) 

 too imperfectly known to be placed in the system. 



14. C. pellucida Hantzsch (1862). — Broadly elliptical. L. 0,o3 to 0,i ; B. 0,o2 to 0,07 mm. 

 Upper V. with rather broad linear, and straight axial area, on both sides of which are about 5 

 longitudinal parallel rows of short strise, 30 in 0,oi mm. Lower V. with a marginal line and 

 straight median line, ending at a distance from the margin in lunate terminal areas. Terminal 

 fissures in contrary directions. Strise 21 in 0,oi mm., slightly radiate, finely punctate. — Ostind. 

 Archip. D. p. 21 f. 11. Grun. Novara p. 12. Witt a. Tkuan Jeremie D. p. 15 PI. IV f. 11 

 (f. 12. 20, 21 varieties with less numerous furrows) A. S. Atl. CXCIV f. 2; OXCV f. 1 to 6. 

 C. oceaniea Ehb. Pritch. Inf. PL XII f. 42? C. notabilis Pant. Ill PL XXXV f. 492 (1893). 

 C. circumcincta A. S. Atl. CXCV f. 7 to 9 (1894). 



Marine: Nicobar Islands (Grun.), Java! Sumatra! Singapore! Sandwich Islands! Behrings 

 Island! Madagascar! New Zealand (Grun.). Fossil: Nankoori (Grun.), Hungary (Pant.), Hayti (Witt). 



Var. minor Grun. (1867). — L. 0,oi9 to 0,oa] B. 0,oi3 to 0,o.3 ram. Upper V. with about 

 4 strong furrows on each side of the axial area. Lower V. with straight, or slightly sigmoid 

 median line, reaching almost to the margin. Strise 20 in 0,oi mm. — Novara p. 13 PL I f. 7. 

 C. lineata Ehb. M. G. VI, 1, 40. 



Marine: Red Sea! S:t Pauls Island (Grun.), Cape Good Hope (Grun.), Nicobar Islands (Grun.), 

 New Zealand (Grun.), Trinidad! 



Var. nanhoorensis Gkun. (1867). — L. 0,05,5 to 0,12; B. 0,045 to 0,09 mm. Upper V. with 

 about four furrows on each side of the area. Strise 11 to 14 in 0,oi mm. — Novara p. 98. A. S. 

 Atl. CXCIV f. 15. C. pell. var. fossilis Pant. Ill PL XXXII f. 465 (1893). C. LunyacseMi 

 Pant. Ill PL XLI f. 564 (1893). 



15. C. pseudomavginata Greg. (1857). — Elliptical. L. 0,o38 to 0,o84; B. 0,026 to 0,o7 6 

 mm. Upper V. with narrow, lanceolate axial area and on each side of it lunate depressions. 

 Strise 16 to 24 in 0,oi mm., punctate. Lower V. with straight median line, ending at some dis- 

 tance from the margin in small, lunate terminal areas. Axial area narrow, central small orbi- 

 cular. Strife 20 to 24 in 0,oi mm. radiate, punctate. — D. of Clyde p. 492 PL IX f. 27 (entire 

 frustule) Pritch. Inf. PL VII f. 39. V. H. Syn. XXIX f. 20, 21. A. S. Atl. CXCIV, 5 to 7. 

 C. major Greg. D. of Clyde PL IX f. 28 (lower V.). C. pellucida Grun. Verb. 1863 p. 145 

 PL IV f. 6. C. Kirchenpaueriana Jan. and Rabh. D. of Honduras p. 7 PL I f. 9? C. Henrioti 

 Pet. D. de Cape Horn p. 117 PL X f . 7 (1888)? 



Marine: Greenland! Spitsbergen! Sea of Kara! North Sea! Mediterranean! Red Sea! Sey- 

 chelles! Madagascar! China! Galapagos Islands! Sandwich Islands! Honduras (Rabh.), Hungary, 

 fossil (Pant.). 



Var. intermedia Grun. (1867). — L. 0,05 to 0,06; B. 0,04 to 0,045 mm. Lower V. with slightly 

 sigmoid median line. Strise 20 in 0,oi mm. — Novara p. 13 PL I f. 6. C. duplex A. S. Atl. CXCIV, 1. 



Marine: Corsica! Cape Good Hope (Grun.). Nicobar Islands (Grun.), Philippines (Grun.), 

 Sandwich Islands! Tahiti (Grun.), Japan! 



16. C. heteroidea Hantzsch (1862). — Broadly elliptical to almost orbicular. L. 0,035 to 

 0,07; B. 0,025 to 0,065 mm. Upper V. with broadly linear, more or less distinctly sigmoid, or 

 oblique axial area, on both sides of which are 3 to 5 arcuate furrows. Strise 25 in 0,oi mm. 

 Lower V. with sigmoid median line, not reaching to the margin. Axial area narrow, central area 

 smaU, frequently transversely dilated into a narrow fascia. Strise 18 to 22 in 0,oi mm. radiate. 

 Terminal areas lunate, frequently prolonged into a line parallel to the margin of the valve. 

 — Ostind. Arch. D. p. 21 f. 10. Grun. Novara p. 12. A. S. Atl. CXCVI f. 2, 33 to 37, 40, 41. 

 C. lunata Leud. Fortm. D. de Ceylon PL I f. 3. G. recurva A. S. Atl. CXCVI 31, 32 (1894). 

 C. tenella A. S. 1. c. f 38. C. transversa A. S. 1. c. f. 39. 



