17<S 1\ T. CLEVE, SYNOPSIS OF THE NAYICULOID DIATOMS. 



A. somewhat similar, but much smaller, valve is C. Khileri Pant. (Ill PI. II f. 30; 18i)3) 

 too imperfectly known to be placed in the system. 



U. C. pellucida Hantzscii (1862). — Broadly elliptical. L. 0,o,3 to 0,i ; B. O.o-i to 0,07 mm. 

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

 longitudinal parallel rows of short stri;T3, 30 in 0,01 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. Stritie 21 in 0,01 mm., .slightly radiate, finely punctate. — Ostind. 

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

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

 C. occanica EiiB. Pritch. Inf. PI. XII f. 42? (J. notahilis Pant. Ill PI. XXXV f. 402 (18!);5). 

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



Marine: Nicobar Islands (drun.), .lava! Sunuitra! Singapore! Sandwich Islands! Behrings 

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



Var. minor Grun. (1867). — L. 0,019 to 0,()^ ; B. 0,oi3 to 0,o.'j mm. Upper V. with about 

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

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

 C. h'ueafa Eiib. M. G. VI, 1, 40. 



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

 New Zealand (Grun.), Trinidad! 



Var. ndnloorcnsis Grun. (1867). — L. 0,or).^) to 0,12; B. 0,04.'') to 0,09 mm. Upper V. with 

 about four furrows on each side of the area. Stria? 11 to 14 in O.oi mm. — Novara p. 98. A. S. 

 Atl. CXCIV f. 15. C. pcU. var. fossilis Pant. Ill PI. XXXII f. 465 (1893). C. Lunyacsclm 

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



15. C. pseiidomarginata Greg. (1857). — Elliptical. L. o,o;i8 to 0,o84; B. 0,o2fi to 0,070 

 mm. Up])er V. with narrow, lanceolate axial area and on each side of it lunate depressions. 

 Striu' 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 uarroA\', central small orbi- 

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

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

 a. major GRK(i. D. of Clyde PI. IX f. 28 (lower V.). 6'. pellucida Grun. Verb. 1863 p. 145 

 PI. 1 V f. 6. ('. Kirclic}ipaueriana Tan. and Rarh. D. of Honduras p. 7 PL I f. 9? C. Hcnrioti 

 IVr. D. de Cape Horn p. 117 PL X L 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. (1S67). — L. OjO.'i to 0,o6; B. 0,o4 to 0,04.') mm. Lower V. with slightly 

 sigmoid median line. Stria'. 20 in 0,oi mm. — Novara p. 13 PL I f. 6. C. dxjtJex A. S. Atl. CXCIV, \. 



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

 Saiulwich Islands! Tahiti (Grun.), Japan! 



16. C. Iiotoroidea Hantzscii {18(52). — Broadly elliptii-al to almost (U'lticnlar. L. O.o.!.^, to 

 0,07; B. 0,()2.-) to 0,ii(i5 mm. Upper \. with broadly linear, more or less distinctly sigmoid, or 

 oblique axial area, on l)oth .sides of which ai'e 3 to 5 arcuate furrows. Stria? 25 in 0,oi mm. 



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



small, frequently transversely dilated into a narrow fascia. Stri;t' 18 to 22 in 0,oi mm. I'adiate. 

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

 — Ostind. Arch. 1). p. 21 f. U). ' Grun. Novara p. 12. A. S. Atl. CXCVI f. 2, 33 to 37, 40, 41. 

 ('. (iitiala Li:i I.. FoHTM. D. <h' Ceylon PL 1 f. 3. C. recurra A. S. All. CXCVI ;!1, 32 (1894). 

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



