KONGL. SV. VE'V. AKADEMIKNS II A Nl)l>IN(JAi;. HAND 27. N:() 3, 179 



Marine: Seyelielles! Madagascar! Mauritius! Nicobar Islands (Grun.), Singapore! Japan! 

 China! Sandwich Islands! Samoa! West Indies! Colon! 



Var. curvirotnnda Temp, and Brun (1889). — L. <),i to <),i-j; Ji. (),o'.i to O.ior, nun. Lower 

 V. with tine, slightly sigmoid median line, ending at some distance from the margin in lunate, 

 small areas. Central area small and orbicular. Striai 13 in 0,0 1 mm. -- C. (^pidl. vur.Y) viinuro- 

 tnnda Br. and Temp. D. foss. du Japon p. 32 PI. VIII f. (>. A. S. Atl. CXCV f. 10 to 17? 

 C. composiia A. S. Atl. CXCVI f. 4, 5? 



Marine: Japan, fossil (Brun). 



Var. sujmoiilra (tRUN. (18(i7). — L. 0,025; B. 0,02 mm. Median line sigmoid; cfuti'al area 

 transversely dilated. — C. pdlnc. var. slgwoidcd (tRUN. Novara ]>. l;! PI. I f. -S. C. ixirlhcnopoea 

 Pedic. Rab. Alg. Eur. N:o 222;5 (1870). 



Marine: Naples! Red Sea! Tahiti ((Irun.). 



Var. conspicua A. S. (1894). — Lower V. witli a row of large puiicta between the median 

 line and the margin. — C. consp. Atl. CXCVI, 27, i'S. 



Marine: Kings Mill Island, Singapore, Samoa (Atl.). 



17. C. Ciclophora Guun. (1879). — Broadly elliptical. L. 0,017 to 0,028; B. (),oi to O.ois 

 mm. Upper V. with sigmoid lanceolate axial area, lunate lateral areas, and on one side of the 

 centre a large circular annulus. Strife 16 in 0,o 1 mm. of decussating puncta. Lower \. with 

 sigmoid median line and narrow axial area, not dilated in the middle. Stri;e 28 in 0,oi mm. 

 of small puncta, forming decussating lines. Close to the central nodule is a large, circular an- 

 nulus. - Cl. M. V>. N:o 254. Grun. A. I), p. IG. V. H. Syn. XXX f. 24, 2.5. 



Marine: South Australia! 



Var. CJidlloifjcri Cl. — L. O.or).-) to 0,o7; B. 0,o4 to O.ot; mm. Upper V. with scarcely 

 sigmoid, in the middle transversely dilated, axial area, on both sides of it a lunate lateral area, and 

 on one side of the middle a circular annulus. Stria; 17 in 0,oi mm. coarsely punctate; puncta 13 

 in 0,01 mm. Lower V. with slightly sigmoid median line, and narrow axial area not dilated in 

 the centre. Striie 24 in 0,01 mm. punctate; puncta l(i in 0,oi inm. On one side of the central 

 nodule a circular annulus. 



Marine: Off Marion Island Challenger St. 14.5 (Comber Coll.)! 



18. C. flexella Kutz (1844). — Rhomboid-elliptical, with obtuse broad ends. L. 0,04 to 

 0,05; B. 0,02 mm. Upper V. with narrow sigmoid linear axial area not centrally dilated. 

 Strifr. radiate throughout 16 in 0,oi mm. Lower V. with sigmoid median line, narrow axial area, 

 small and elongated central area. Striae 17 in 0,01 mm. radiate throughout, punctate, in the middle 

 alternately longer and shorter. — Cynihella flexella KtJTZ. Bac. p. 80 PI. IV f. 14. Cocco)ici.s 

 Thicaitcsii W. Sm. B. D. I p. 21 PI. Ill f. 00 (1853). Achnanthidiiim flcxellum. Br^b. in Kixtz. 

 Sp. Alg. p. 54. Grun. A. D. p. 17. V. H. Syn. p. 128 PI. XXVI f. 29 to 31. Navmda Semen 

 EiiB. partim. Navicula 31acula Gre(J. T. M. S. IV p. 43 PL V f. 9? Aehnantliidiuni navicnloides 

 Reinsch (accord, to Grun.). 



Fresh water: Spitsbergen (Lagst.), Beeren Eiland (Ijagst.), Arctic America! Sweden! Fin- 

 land! England! Belgium! Switzerland (Brun.). 



19. C. niinuta Cl. (1891). — Elliptical with broad, rounded ends. L. 0,021 to O.029; 

 B. 0,01 to 0,012 mm. Upper V. with narrow linear axial area, dilated in the middle to a large, 

 orbicular central area. Strict 20 in 0,oi mm., almost parallel. Lower V. without axial area. 

 Central area large, rounded. Strite radiate, 20 (middle) to 25 (ends) in 0,oi mm. — Cocconeis 

 Thwaitesii var. ^ aretiea LA(iST. Spitsb. D. ]). 41 PL II f. 16 (1873). Achnanfhidiuni iiiiiiitfiiiii Cl. 

 D. of Finl. p. 53 PL III f. 6, 7 (1891). .V. dissimilif, W. Sm. Ann. Mag. Nat. XIX p. 8 PL II 

 f. 6; 1857? 



Fresh vv^ater: Spitsbergen (Lagst.), Finland (Abo)! Sweden (Wenern)! ■ 

 This form resembles greatly Nav. llotaeana var. ohlongella. 



