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



Var. subelliptica Cl. — V. eloiigated, elliptical, non rostrate. L. 0,o6.5 to 0,i3; B. 0,o3.'5 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. Ehrenhergii and gradnates into 

 N. spectabilis. Such transitional forms are the tig. 9 Pl. XV in Janisch Grazelle Exp. D. -A^. Lyra 

 var. proäucta Pant. III 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. Henncdyi 

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



Var. insignis A. S. (1874). — V. elliptical. L. 0,o5 to 0,o68; B. 0,027 to 0, 032 mm. Lateral 

 areas distant, abbreviate. Striaj strongly radiate, 10 (middle) to lo (ends), puncta 18 in 0, 01 mm. 

 — Atl. II f. 27. 



Marine: Japan (Atl.), Madagascar! 



Var.? secluctiUs A. S. (1874). — V. elliptical with rounded ends. L. 0,05; B. 0,015 mm. 

 Areas slightly coiivergent. Strise 14 in 0, 01 mm. — N. .sed. A. S. Atl. II f. 35, f. 36? 



Marine: Ceylon (Atl.). 



Var. acuta Pant. (1889). — V. broadly elliptical, with acute ends. L. 0,o9 to 0,04o mm. 

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



Mai'ine: Hungary, fossil (Pant.). 



Var. lirodncta Pant. (1889). — V. elongate-elliptical. L. 0,145; B. 0,057 mm. Strise 12 in 

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



Marine: Hungary, fossil. 



Var. reda Grbv. (1859). — V. elongated, lanceolate, freqiiently with slightly rostrate ends. 

 L. 0,135 to 0,21; B. 0,0 4 7 to 0,0 7 3 mm. Axial part not distinctly elevated towards the ends. 

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

 in 0,01 mm., forming longitudinal, undulating rows. — Edinb. N. Ph. J. X p. 28 Pl. IV 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. O, la; B. 0,o5 7 mm. Stritie 8, puncta 9 

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



Marine. 



Forma ahnorniis A. S. (1874). — Lanceolate. L. 0, 165; B. O,oii mm. Lateral areas mode- 

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

 punctate. — Atl. II f. 8. 



Marine: Zanzibar (Atl.). 



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

 elevated. Stri;e 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. reeta, but with an orbicular spöt ou both sides of 

 the central nodule, crossed in the middle by a longitudinal, iissure-like marking. L. 0,o9 to 0,10; 

 B. 0,035 to 0,07 mm. Striai and puncta 10 in 0,oi mm. — Atl. II f. 4. N. Zanzihariea rar. 

 A. S. Atl. (!XXIX f. 4. N. Zausih. var. sebiuma Castu. Voy. Challenger p. 31 Pl. XXVllI f. 8. 



Marine: Gnlf of Mexico (Atl.), Elephanta Island (Atl.), Hongkong (Rae Coll.)! Cebu! 



Var. sanziharica Grev. (l.SfiC). — As. var. reeta, but with an orbicular spöt on both sides 

 (if the central nodule, inside wiiicii the puncta form a står of radiate lines. L. 0,2 to 0,24 ; 

 15. <),!)(; to 0,07 mm. Striic and ])nncta S to 9 in (l.oi mm. -- N. sang. Grkv. T. M. S. 1866 

 ).. l-.^9 i>l. XII f. 24. A. S. Atl. II f. 3. 



Marine: Zanzibar! Seychelles! Madagascar! Snnmtra! 



