64 p. T. CLEVK, SYNOPSIS OF THE NAVICULOID DIATOMS. - 



Var. suhcWq^tica Cl. — V. elongated, elliptical, non rostrate. L. 0,oGr> to 0,i.s; B. O,!).-?-, to 

 0.048 mm. Lateral area.s as in var. Ehr^nbergii. Strife 9 to 11, pnneta 17 to 22 in O.oi nini. 



Marine: Spitsbergen! Fiiimark! North Sea! Japan! Philippines! Fossil at Bory Hungai^y! 

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



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

 N. spectahilis. Such transitional forms are the tig. 9 PL XV in Janisch fiazelle Exp. D. N. Lifrd 

 var. producfa Pant. Ill PI. XXXIIl f. 4(j6 and var. acuta f. 468, var. hungarica Pant. PI. XXXIV 

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

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



Var. iusignis A. S. (1874). - V. elliptical. L. 0,o.t to 0,068; B. 0,o27 to 0,0.'? 2 mm. Lateral 

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

 — Atl. II f. 27. 



Marine: Japan (Atl.), Madagascar! 



Var.? seduct'dis A. S. (1874). — V. elliptical witli rounded ends. L. 0,or); B. 0,uir) mm. 

 Areas slightly convergent. Strise 14 in O.oi mm. — N. scd. 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 0,040 mm. 

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



Marine: Hungary, fossil (Pant.). 



Yar. producta Pant. (1889). — V. elongate-elliptical. L. Oj+n; B. 0,or,7 mm. Striae 12 in 

 0,0 1 mm., slightly radiate. — Pant. II p. 50. 



Marine: Hungary, fossil. 



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

 L. 0,1 3.T 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. Strife 7 to 12; puncta 10 to 12 

 in 0,01 mm., forming longitudinal, undulating rows. — Edinb. N. Pli. J. X p. 28 PI. 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, fos.sil! Rio Janeiro (Deby f^oll.)! 

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



Forma foriucata A. S. (1874). — Lanceolate. L. 0, ir. ; B. 0,o.->7 mm. Strife 8, puncta 9 

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



Marine. 



Forma ahnormis A. S. (1874). — Lanceolate. L. O.ifis; B. 0,ofi mm. Lateral areas mode- 

 rately broad. Strife 8, puncta about 10 in (),oi mm. Median striee much closer and more finely 

 punctate. — Atl. II f. 8. 



Marine: Zanzibar (Atl.). 



Var. suhrarinata Grun. (1.S74). — As var. recta, but with the axial part of the valve 

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



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



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

 the central nodule, crossed in the middle by a longitudinal, fissure-like marking. L. 0,09 to 0, u;; 

 B. 0,03.5 to 0,07 mm. StrifB and puncta 10 in 0,oi mm. — Atl. II f. 4. N. Zanzibarica rar. 



A. S. Atl. CXXIX f. 4. N. Zauzib. rar. .zebuana Castr. Voy. Challenger p. 31 PL XXVIII f. 8. 



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

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

 of the central nodule, inside which the puncta form a star of radiate lines. L. 0,2 tn 0,-j4 ; 



B. 0,of, to 0,07 mm. Strife and puncta 8 to 9 in O.oi mm. — N. zanz. Grkv. T. M. S. 1866 

 ].. 129 PL XIT f. 24. A. S. Atl. II f. 3. 



Marine: Zanzibar! Seychelles! Madagascar! Sumatra! 



