1 10 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Var. seychellensis Cl. — V. in L. 0,o36; B. 0,oi mm. with capitate, incurved ends. Dorsal 

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

 line. Ventral side smooth. 



Marine: Seychelles (Van Heurck Coll.)! 



Var. minor Pant. (1«89). — L. of V. 0,o5i; B. 0,oo9 mm. Striae 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,o65 to 0,i mm.; B. 0,oi3 to 0,oi7 mm. Striae 6 to 7 in 0,oi 

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

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



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



3. A. Pecten Brdn (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, transverse costae, about 2,5 in 0,oi mm. V. linear with inflated and incurved, 

 acuminate ends. L. 0,i6 to 0,22; B. 0,o3 mm. Dorsal side with strong, transverse costae, 2,3 to 

 3 in 0,01 mm. Spaces between the costae 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. especes nouvelles p. 9 PI. XII f. 4. 

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

 PI. XX f. 21. A. alveolata Lbud. Foktm. D. de Ceylon p. 19 PI. I f. 8? A. scalaris Caste. Voyage 

 Challenger D. p. 18 PL XXVII f. 19? 



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

 Nossi Be (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,i3 to 0,17; B. 0,o2 to 0,025 mm. Costae 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. inornata Cl. N. Sp. ~ Frustule elliptical. L. 0,056; B. 0,023 mm. Divisions of the 

 zone broad, 5 to 6 in 0,oi mm. Striae 18 in 0,oi mm. Valve linear, with obtuse ends curved in- 

 wards. L. 0,065 to 0,166; 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 striae 10 to 15 in 0,oi 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 ends, about 

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

 to 6 in 0,01 mm. V. linear with broad, obtuse ends curved inwards. L. 0,o6 to 0,i7; B. 0,oi4 to 

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

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

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

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

 fide 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. exornata Jan. A. S. Atl. XXXIX f. 26. A. bi- 

 striata Leud. Fobtm. D. de Ceylon p. 20 PL I f. 12 (1879). A. egregia var. neogradensis Pant. II 

 p. 38 PL IV f. 64 (1889). A. selrata Temp, and Brun D. f. du Japon p. 16 PL VII f. 14 (1889). 



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

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

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



