10 v. T. CLEVE. DIATOMS FROM JAVA. 



32. Chsetoceros Javanicum Cl. iV. .s^. Fi-ustules closely 

 imited into a filament, liavincr narrow foramina: awns straight 

 with small puncta arranged in spirals. Heiglit of the frust. 

 (f v.) 0,0 168 m.m. Breadth 0,oi92 m.m. 



Somewhat rare. Pl. II fig. 13. 



33. Chsetoceros Ralfisi Cl. N. sp. Frustules closely united 

 into a filament, having oval foramina. Terminal awns qnadran- 

 gular, with small and someAvhat distant aculei on tlie angles, 

 curved in the middle. Other awns straight, with indistinct 

 sculpture. 



This species resembles Ch. affine Lauder, but the awns are 

 dissimilar. Pl. III fig. 15. 



Height of the frustide (f v.) 0,024 m.m. breadth 0, 012 m.m. 

 Xot verv rare. 



34. Chaetoceraros secundum Cl. N. sp. Frustules united in 

 chains, which are somewhat curved and have large broad and 

 regularlv oval, almost circular, foramina. Sideview broadly oval, 

 with all the foiu- seta? curved in oue and the same direction. 

 Sporangial cells (f. v.) oval with small marginal setse. Length 

 and breadth the fr. (f v.) 0, 024 m.m. Pl. II fig. 14 a. spor- 

 angial cells f. v. b. s v. 



Somewhat rare. 



3ä. Chsetoceros paiadoxum Cl. X. sp. Frustules united in 

 chains, which have lar«:e, oval foramina. Sideview oval with 

 long awns, curved together in the direction of the shortest axis 

 of the cell. Awns with very flat, alternating elevations, some- 

 what distant from each otliers. Frontview very diflficult to see, 

 because the long awns there meet each other. 



Length and breadth of the Fr. 0, 024 — 0,036 m.m. 



Somewhat rare. Pl. III fig. l(i a. f v. b s. v. 



3(i. Chsetoceros equatoriale Cl. iV. sjj. Frustule cylindri- 

 cal, siliceous, awns strong, sigmoid curved, parallel, with dis- 

 tinct, spirally arranged spines. Breadth of the frustule 0,0 12 

 m.m. Height O.024 m.m. Length of the awns 3,8 5 m.m. 



Very rare, only two specimens observed. This species is 

 most nearly related to Ch. boreale, but is distlnguished by the 

 curved and parallel awns. Pl. II fig. 9. 



