110 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Var. seychellensis Cl. — V. in L. U,u36; B. 0,ui mm. with capitate, incurved ends. Dorsal 

 side with 15 punctate strise in 0,oi mm. Longitudinal line distinct, approximate to the median 

 line. Ventral side smooth. 



Marine: Seychelles (Van Heurck Coll.)! 



Var. minor Pant. (1889). — L. of V. 0,o5i; B. 0,oo9 mm. Stri^e 15 in 0,oi mm. Ventral 

 side with rows of distant puncta. — Pant. II p. 36 Pl. III f. 51. 



Marine: Fossil, Hungary (Pant.). 



Var. spuria Cl. — V. in L. 0,o6 5 to 0,i mm.; B. 0,oi3 to 0,oi7 mm. Striee 6 to 7 in 0,oi 

 mm. not distinctly punctate oiitside the longitudinal line, coarsely punctate inside the longitu- 

 dinal line. Ventral side with longer or shorter strite. — A. S. Atl. XXVIII f. 21? 



Marine: Sumatra (Deby Coll.)! Macassar Straits! Samoa! Magel]an's Strait! Colon (Deby Coll.)! 



3. Å. Pecten Brun (1891). — Frustule rectangular, twice as long as broad, with somewhat 

 convex margins and truncate ends. Connecting zone with numerous divisions, 2 in 0,oi mm., 

 crossed by smooth, trausverse costse, about 2,5 in 0,oi mm. V. linear with inflated and incurved, 

 acuminate ends. L. O, le to 0,22; B. 0, 03 mm. Dorsal side with strong, transverse costee, 2,3 to 

 3 in 0,0 1 mm. Spaces between the costse smooth. Median line biarcuate. Longitudinal line 

 approximate to the median line. Furrow between both lines with a row of large ocelli. Ventral 

 side broad, smooth and with a strong longitudinal line. — D. espéces nouvelles p. 9 Pl. XII f. 4. 

 Cl. a. Grove Diatomiste I p. 157 Pl. XXII f. 5 to 7. A. prcevalida Janisch Gazelle Exp. 

 Pl. XX f. 21. A. alveolata Leud. Fortm. D. de Ceylon p. 19 Pl. I f. 8? A. scalaris Castr. Voyage 

 Challeuger D. p. 18 Pl. XXVII f. 19? 



Marine: Colombo, Ceylon (Le Tourneur Coll.)! Madagascar (Kinker aud Van Heurck Coll.)! 

 Nossi Bé (Brun Coll.)! Macassar Straits (Grove Coll.)! Fossil: Oamaru, N. Zeal. (Grove Coll.)! 

 Sn Pedro Calif. (Kinker Coll.)! 



Var. Argus Cl. — L. of the V. 0, 13 to 0,1?; B. 0,02 to 0,025 mm. Costffi of the dorsal 

 side 4 in 0,oi mm. alternating with a few ocelli, arranged in longitudinal rows. Ventral side 

 with a strong keel. 



Marine: Madagascar (Van Heurck, Brun, Kinker Coll.)! Colon (Deby Coll.)! 



4. A. inoruata Cl. N. Sp. — Frustule elliptical. L. 0,o56; B. 0,023 mm. Divisions of the 

 zone broad, 5 to 6 in 0, 01 mm. Strise 18 in 0, 01 mm. Valve linear, with obtuse euds curved in- 

 wards. L. 0,065 to 0,i66; B. 0, 01 to 0,02 mm. Median line almost straight. Longitudinal line 

 rather near the median line. No areas on the dorsal side. Dorsal strite 10 to 15 in 0, 01 mm. 

 smooth. Ventral side structureless. — Pl. IV f. 35, 36. 37, 38. 



Marine: Java! Macassar Straits (Grove Coll.)! 



5. A. egregia (Ehb. 1861?) A. S. (1875). — Frustule rectangular with rounded eiuls, aboiit 

 2 or 3 times longer than broad. Zone with 2 to 4 divisions in 0, 01 mm.; its transverse costa? 5 

 to 6 in 0,01 mm. V. linear with broad, obtuse ends curved inwards. L. O.ot; to 0, 17; B. 0,oi4 to 

 0,03 mm. Dorsal side without axial area. CosttB 4 to 6 in 0, 01 mm. alternating with double 

 rows of small puncta, about 18 in 0,o 1 mm., and crossed by a distinct longitudinal line. Ventral 

 side usually with a row of strong, costate striic, on larger specimens frequently also with a 

 number of minute, irregular puncta. No longitudinal line on the ventral side. — Ber. 1861 p. 294 

 iide Chase? A. S. Atl. XXVIII f. 13, 14. A. sp. Atl. XXVIII f. 12, 18. A. crassa var. Atl. 

 XXXIX f. 31. A. sp. Atl. XXXIX f. 27. A. cxornata Jan. A. S. Atl. XXXIX f. 26. A. bi- 

 striatu Leud. Fortm. D. de Ceylon p. 20 Pl. I f 12 (1879). A. cgrcyia var. neoyradvnsis Pant. Il 

 p. 38 Pl. IV f. 64 (1889). A.' zchrata Temp. and Brun D. f. du Japon p. 16 Pl. VII f 14 (1889). 



Marine: Morocco! Mediterranean Sea! Ceylon! Seychelles! Nossibé! Singapore! Java! Sum- 

 bava! Macassar Straits! Chiua! Samoa (Atl.), Galapagos Islands! Campeachy Bay! West Indies! 

 Fossil: Hungary (Pant.), Gamaru, New Zealand! 



