64 V. T. CLEVK, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Var. subelliptica Cl. — V. elongated, elliptical, non rostrate. L. 0,065 to 0,i3; B. 0,035 to 

 0.04 8 mm. Lateral areas as in var. Ehrenbergii. Strise 9 to 11, puncta 17 to 22 in 0,oi mm. 



Marine: Spitsbergen! Finmark! North Sea! Japan! Philippines! Fossil at Bory Hungary! 

 Monterey and S:ta Monica, Calif.! Mexillones guano (Deby Coll.)! 



This variety is nothing but a non-rostrate form of the var. Ehrenbergii and graduates into 

 N. spectabilis. Such transitional forms are the fig. 9 PL XV in Janisch Gazelle Exp. D. N. Lyra 

 var. producta Pant. Ill PL XXXIIl f. 466 and var. acuta f. 468, var. hungarica Pant. PL XXXIV 

 f. 479. A specimen in Deby's Coll. from Bory in Hungary approaches very near to N. Hennedyi 

 var. fossilis Pant. II PL XII f. 207. 



Var. insignis A. S. (1874). — V. elliptical. L. 0,05 to 0,o68; B. 0,027 to 0,032 mm. Lateral 

 areas distant, abbreviate. Striaj strongly radiate, 10 (middle) to 13 (ends), puncta 18 in 0,oi mm. 

 — Atl. II f. 27. 



Marine: Japan (Atl.), Madagascar! 



Var.? seductilis A. S. (1874). — V. elliptical with rounded ends. L. 0,05; B. 0,oi5 mm. 

 Areas slightly convergent. Strise 14 in 0,oi mm. — N. sed. A. S. Atl. 11 f. 35, f. 36? 



Marine: Ceylon (Atl.). 



Var. acuta Pant. (1889). — V. broadly elliptical, with acute ends. L. 0,09 to 0,0 4 mm. 

 Striae 12 in 0,oi mm. — Pant. II p. 50. 



Marine: Hungary, fossil (Pant.). 



Y a,r. producta Pant. (1889). — V. elongate-elliptical. L. 0,145; B. 0,057 mm. Striae 12 in 

 0,01 mm., slightly radiate. — Pant. II p. 50. 



Marine: Hungary, fossil. 



Var. recta Grbv. (1859). — V elongated, lanceolate, frequently with slightly rostrate ends. 

 L. 0,135 to 0,21; B. 0,047 to 0,o7.s mm. Axial part not distinctly elevated towards the ends. 

 Lateral areas linear, parallel, approximate to the median line. Strise 7 to 12; puncta 10 to 12 

 in 0,01 mm., forming longitudinal, undulating rows. — Edinb. N. Ph. J. X p. 28 PL FV f . 3 

 (1859). A. S. Atl. II f. 18. Peragallo Villefr. D. p. 49 PL IV f. 36. Janisch Gaz. Exp. XV f. 8. 



Marine: Mediterranean Sea (Perag.), S:t Peter Hungary, fossil! Rio Janeiro (Deby Coll.)! 

 Gulf of Mexico (Atl.), California guano (Grev.), Seychelles and Samoa (Van Heurck Coll.)! 



Forma fornicata A. S. (1874). — Lanceolate. L. 0,15; B. 0,057 mm. Striae 8, puncta 9 

 in 0,01 mm., crossed by an arcuate, blank line. — Atl. II f. 9. 



Marine. 



Forma abnormis A. S. C1874). — Lanceolate. L. O.ies; B. 0,o6 mm. Lateral areas mode- 

 rately broad. Striae 8, puncta about 10 in 0,oi mm. Median striae much closer and more finely 

 punctate. — Atl. II f. 8. 



Marine: Zanzibar (Atl.). 



Var. subcarinata Grdn. (1874). — As var. recta, but with the axial part of the valve 

 elevated. Striae 11 to 16, puncta 12 to 14 in O.oi mm. — A. S. Atl. II f. 5. 



Marine: Ceylon! Seychelles! Java (Kinker Coll.)! Singapore! Philippines! Samoa! Tahiti! 



Var. signata A. S. (1874). — As var. recta, but with an orbiculai- spot on both sides of 

 the central nodule, crossed in the middle by a longitudinal, fissure-like marking. L. 0,o9 to 0,i6; 

 B. 0,035 to 0,07 mm. Striae and puncta 10 in 0,oi mm. — Atl. II f. 4. N. Zanzibarica var. 



A. S. Atl. CXXIX f. 4. N. Zauzib. var. zebuana Castr. Voy. Challenger p. 31 PL XX,VIII f. 8. 



Marine: Gulf of Mexico (Atl.), Elephanta Island (Atl.), Hongkong (Rae Coll.)! Cfebu! 

 Var. sansibarica Grev. (1866). — As. var. recta, but with an orbicular spot on both sides 

 of the central nodule, inside which the puncta form a star of radiate lines. L. 0,2 to 0,24' 



B. 0,06 to 0,07 mm. Striae and puncta 8 to 9 in 0,oi mm. — N. zanz. Grev. T M S 1866 

 p. 129 PL XII f. 24. A. S. Atl. II f. 3. 



Marine: Zanzibar! Seychelles! Madagascar! Sumatra! 



