384 NEW OR CRITICAL BRITISH MARINE ALG-E. 



75. GOMPHONEMA TENELLUM Ktltz. (W. Sm. I. C. 80, t. Xxix. fig. 



243). Inkuyuni, Kamassia. 



76. G. CAPITATUM Ehrnb. (W. Sm. I. c. t. xxviii. fig. 237). 

 lukuyuni, Kamassia. 



77. Rhoicosphenia ? contracta (Kiitz.) Rabh. (Fl. Europ. Ahjar. 

 i. 292). G. Laschan, Leikipia. 



Explanation of Plate .361. 



a, a' = front view (a fronte visa). c = side view (a latere visa). 



b = vertical view (a vertice visa). d = basal view of semicell (a basi visa). 



Yig?,. 1-2. Nostochopdxlohatus VfooA. 520/1. /(, stalked heterocysts ; /('sessile 



heterocysts. 

 Fig. 3. Cvclosplucrinm confertum, n. sp. A few of the cells. 830/1. 



,, 4. Ccelastruiii Morns, n. sp. 520/1. 



Figs. 5-6. Arthrospira plutemis (Nordst.) Gomont. 520/1. 



,, 7-8. Cosmarium plohulatum, n.s]). 520/1. 

 Fig. 9. „ pectinoidcs Wolle. 520/1. 



,, 10. Euastrum hexagonnm, n. s^j. 520/1. 



,, 11. Cosmarium Mivdiuiadancni^c, n. sp. 520/1. 



„ 12. „ trochiscum, n. sp. 520/1. 



,, 13. Staurastrum nephroideiim, n. s^. 520/1. 



„ 14. Cosiiiariiim rectaiujitlare Gvun. vsLV. afric(nium, n.\a.Y. 520/1. 



,, 15. ,, subcostatiiin Nordst. forma minor. 520/1. 



,, 16. Staiirastriim siiJtdilatatum, n.S]}. 520/1. 



„ 17. Cosmarium subrenustum, n. sp, 520/1. 



,, 18. ClosteriiDii Uttorule Gay, yiiv. crassiuii, n.\a,x. 520/1. 



NEW OR CRITICAL BRITISH MARINE ALG^. 



By E. A. L. Batters, B.A., LL.B., F.L.S. 



The species recorded iu the accompanying list are, so far as 

 I am aware, new to Britain ; and, with the exception of the Litho- 

 thamiiia, nearly all of them have been added to our marine flora 

 during the last few months, principally through the exertions of 

 Mr. George Brebner, who still continues his research-work at 

 Plymouth with the most satisfactory results. For the identification 

 of the Lithothmmiia I am indebted to Mr. M. Foslie, of Trondhjem. 



1. Oscillatoria rosea = Osciilana rosea Crn. Flor. Finist. 113, 

 pi. 2, gen. 16. Trichomata deep purple-red, from 2 to 4 mm. long 

 and from 4 to 5 /x in diameter, more or less bent and twisted, 

 slightly curved at the apex ; cells about as long as broad ; apical 

 cell sharply pointed. On a polyzoan attached to a piece of broken 

 bottle dredged from deep water, "Queen's Ground," Plymouth, 

 G. Brebner. 



When fresh the trichomes of this species are of a clear purple- 

 red colour, which soon fades when the plant is mounted in Dean's 

 medium. In all respects the British specimen agrees with the figure 

 and description of the species given by the Crouans. 



2. Symploca atlantica Gom. Manor/. Oscil. 129, var. purpurea, 

 nov. var. Erect filaments from 800 /x to 1 mm. long and from 6 to 



