KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 99 



Var. typica Cl. — V. not constricted. L. 0,o85 to 0,i9; B. 0,o3 to 0,05 mm. Costae 4 in 

 0,01 mm. — Nav. gemmata Gtrev. Ed. N. Ph. J. X July 1859 p. 30 PI. IV f. 7. Nav. gemmata 

 var. Useriata Grun. Novara 100 PL 1 A i. 16. Nav. gemmata var. spectahilis Grun. A. S. Atl. 

 VIII f. 38? Nav. Basilica Brun. D. especes n. p. 32 PL XV f. 14 (1891)? Nav. pseudogemmata 

 Pant. Ill PL XXIX f. 420 (1893). 



Marine: Gulf of Naples! Nossibe! South Sea (Van Heurck Coll.)! Galapagos Islands! Cam- 

 peachy Bay! West Indies! Fossil: Hungary (Pant.), Moravian Tegel! Nankoori! Californian 

 Guano (Grev.). 



In the coll. of Prof. Bron I have seen a specimen from Sendai, which agrees with his Nav. 

 Basilica and is only a somewhat elliptical form of D. gemmata. 



Var. minor Cl. — L. 0,09 to 0,i6; B. 0,027 to 0,035 mm. CostEe 5 in 0,oi mm. —A. S. Atl. 

 LXX f. 73. 



Marine: Balearic Islands! Madagascar! Colon (Deby Coll.!), Jamaica (Atl.). 



Var. punctata Cl. — L. O.u; B. 0,04 5 mm. Costee 5 in 0,oi mm. Furrows with transverse 

 rows of large puncta. Costfe alternating at their interior ends with one or in the middle with 

 two large ocelli. 



Marine: Sm Pedro, Calif. (Kinker Coll.)! 



Var. spectahilis Grun. (1860). — L. 0,062 to 0,i7; B. 0,025 mm. Costse 3 to 5 in 0,oi mm. 

 continued across the furrows. — Nav. spectahilis Grun. Verh. 1860 p. 533 PL III f. 11. Nav. 

 Grunotvii Eabh. F1. E. Alg. p. 203 (1864). 



Marine: Adriatic (Grun.), Sumbava (Kinker Coll.)! Fossil: S:t Peter, Hungary. 



Var. oamaruensis Cl. — V. slightly constricted. L. 0,i6; B. 0,o4 mm. Horns of the central 

 nodule more distinct and distant. Furrows with faint markings of the costee which become strong 

 along the horns. Costae 5 in 0,oi mm. alternating near the furrows with two large ocelli. 



Marine: Oamaru, New Zeeland, fossil! 



Var. madagascarensis Cl. — V. narrow, very slightly constricted. L. 0,i3; B. 0,024 mm. 

 Horns distinct and somewhat distant. Furrows with two longitudinal rows of puncta along the 

 horns. Costse 6 in 0,oi mm. 



Marine: Tamatave (Kinker Coll.)! 



Var. pristiophora Jan (1881). — V. distinctly constricted in the middle. L. 0,i to 0,i.^; 

 B. 0,02.') to 0,036 mm. Costce 5 to 6 in 0,oi mm. — Nav. pristiophora A. S. Atl. LXX f. 72. 



Marine: Morocco! Porto Seguro (Deby Coll.)! Leton Bank (Atl.). 



Forma minuta Cl. — L. 0,057; B. 0,oi5 mm. Costse 7 in 0,oi mm. 



Marine: Macassar Straits! 



D. gemmata is very variable, and by the form madagascarensis nearly connected with D. 

 contigua, which may perhaps be only corroded specimens of D. gemmata. 



76. D. Szontaghii, Pant. (1886). — V. elliptic-linear, with broad, rounded ends. L. 0,o3 to 

 0,06; B. 0,016 to 0,022 mm. Central nodule large, quadrate; its horns distinct and distant from 

 the median line. Furrows narrow, linear, with a row of large puncta (spaces between the rudi- 

 mentary costse). Costse 5 in 0,oi mm. alternating with double rows of twice as close alveoli 

 (on corroded specimens alternating with single rows of larger puncta). — Nav. Ssont. Pant. I 

 p. 29 PL III f. 25. PL XXVIII f. 284. Icon. n. PL II f. 7. 



Marine: Sumbava (Kinker Coll.)! Hungary, fossil! 



77. D. Carapylodiscus Grun. (1875). — V. suborbicular. L. 0,o38 to 0,05; B. 0,026 to 

 0,03 mm. Central nodule large, quadrate, its horns strong, distant, and convergent in the middle. 

 Furrows broad, with faint costse. Costse 4 in 0,oi mm. alternating with double rows of faint 

 alveoli. — Nav. suhorhicularis var. Nankoorensis Grun. Novara p. 100 PL I A. f. 15 (1867). Nav. 

 Campylod. Grun. A. S. Atl. VIII f. 9, 10, 12, LXX f. 64, 65. Cocconeis coelata Walker Arn. 

 M. J. II p. 234 PL X f. 5, 6 (1862)? 



