BIHANG TILL K. SV. VET. AKAI). ifANDL. BAM). 1. N:0 11. 9 



26. Chsetoceros denticulatum Laudek (T. M. S. 1. c. p. 71» 

 Pl. VUl iig. 1>). Somewliat rare. Observed before near Hoii<f 

 Kong. 



27. Chsetoceros protuberans Lauder (T. M. S. 1. c. pag. 71> 

 Pl. VIII fig. 11). ^ eiv rare; found before near Hong Kong. 



"2^. Chsetoceros Lorenzianum Grunoav. (Verh. 18()3 pag. 157 

 Pl. Xn^ lig. 13. Ch. relhdosum Lauder 1. c. p. 78 Pl. VIII 

 fig. 12) very commou. The granules of tlie seta^ are A-evy 

 coarsc and visible under a low power, 10 in O, o 2. 5 m.ni. All the 

 setffi are in tlie same plane, wlien observed in the sideview of 

 the filarnent. I have remarked that the direction of the seta' 

 in the different species of the genus Chatoceros is very constant. 



This species has been found before near Hong Kong (Lau- 

 der) and the Xicobarian Ids (Grun). 



29. Chaetoceros coarctatum Lauder? (1. c. pag. 79 Pl. VIII 

 fig. 8) var.? very rare. Pl. II fig. 10 a. b. c. 



Not having had any specimens for comparison I have sonie 

 doubts about the correctness of the determination. 



The iig. b. and c. certainlv belong to the saine species, but 

 of tlie upper valve fig. a. I have only secn detatehed valves. 



30. Chaetoceros distans Cl. Ä\ sj>. Sideview oblong, witli 

 rounded ends and divergent, ciu-ved setai. Frontview quadrate. 

 Cells united into long chains, haA-ing very large quadrate fora- 

 raina. Setie almost smooth, an asperity being perceptible only 

 Avith high poAver and oblique light. 



Breadth of the frustule (f. v.) 0,u2 4 — 0,oi8 m.m. Very 

 comraon. Pl. II fig. 11 a. b. 



31. Chaetoceros diversum Cu. A^. sj). Frustules densely 

 united to eaeh other not leaving ibramina betAveen them. Sefcr 

 of tAvo difterent kinds: the larger stout and somcAAdiat clavate. 

 quadrangular near the apex and distinctly denticulate on the 

 angles; the smaller setaceous and almost smooth. The large 

 spines are alternating in the chain Avith 1 — 2 pairs of the 

 smaller seta\ 



Breadth of the liustule 0, 0075 m.m. Height 0,0096 m.m. 

 This small species is very common. Pl. II fig. 12. 



