L>QS Part III. — Fifteenth Annual Report 





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Diatoms. 



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Asteromphalus heptactis, Ralfs., 















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C. currens, CI., . 















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Corethron hysrtix, Hensen., 





















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Dactyliosolen antarcticus, Castr., 





















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J), medlterraneus var. tenuis, CI., 























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Jihizosolenia alata, Btw., . 



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R. al. var. gracillima, CI., . 









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R. styliformis, Btw., 



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ClLIOFLAGELLATES. 



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Cera than furca, Duj., 



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C. fusus, Duj., .... 



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C. tripos, Ehb. type, . 



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G. tripos var. horrida, CI., 



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C. tripos var. longipes, Baile, 



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Pevidinium divergcns, Ehb., 



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Pyrophacils horologium, Stein., 

























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Chlorophyllacean. 













































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Bacteriastrum delicatulum, CI., n. sp. (PI. fig. 15). Slightly silicious. 

 Frustule cylindrical. Long, axis, 0*015 ; diam., 0*012 mm. Awns aris- 

 ing inside the margin of the valve, furcate, with distinct basal part (in 

 length 0*002 mm.), about eight in the circle. — This species was found 

 very rarely in some samples. It is distinguished from B. varians by 

 its delicate membrane and the long basal parts of the awns. The cell- 

 contents were heaped at the valves, but my specimens were perhaps 

 not healthy when killed by the alcohol. In B. varians, the cell-contents 

 consist of a number of small chromatophores scattered along the wall of 

 the frustule. 



Cerataulina Bergonii, H. P. (Monogr. du Rhizosol., PI. I. figs. 15, 16), 

 rare in some samples. 



Choetoceros atlanticus, CI. (D. f. the Arct. Sea, PI. II. fig. 8), rare in 

 some few samples. 



Choetoceros borealis, Btw., rare. 



var. Brightwellii, CI. (D. f. the Arct. Sea, PI. II. fig. 7a), rare (Nos. 2, 

 9, 17). 



var. solitaria, CI., n. var. Cells isolated, or in pairs. Not very rare. 

 (Nos. 2, 7, 9, 10, 11, 12, 17.) 



Choetoceros criophilus, Castr. (Challenger D., p. 78), rare (Nos. 11, 17). 



Choetoceros curvisetus, CI. (Bih. K. Sv. Vet. Ak. Handl., XX. 32, PI. I. 

 fig. 5), very rare (Nos. 11, 17). 



Choetoceros currens, CI., n. sp. (PI. fig. 8). Cells isolated. Valves 

 dissimilar. Upper valve usually the largest, convex, with the awns 

 arising near the centre. Lower valve flat, with awns arising between the 

 centre and the margin. Valves nearly orbicular. Awns of the upper 

 valve directed in the direction of the sagittal axis, not distinctly striate, 



