ALG^ rRO:M THE WEST INDIES. 2G7 



This variety has the cells of the filaments often somewliat 

 doliform, and closely resembles a Conferva ; it does not, how- 

 ever, break up in the peculiar manner of any species of Conferva 

 {vide fig. 6). The binate chromatophores also put it out 

 of this genus. Fig. 4 probably represents an attempt at con- 

 jugation. 



Two cells are figured (fig. 5) which show an attempt at 

 longitudinal division. 



Ord. DESMIDIACEiE. 



6. Mesotjenium MiCROcoccrM, Kirchn. {AJg. Schles. p. 134.) 

 [PalmogloBa micrococca, Kuetz. TahulcB phycolog. i. p. 20, t. 25. 

 f. 5.] 



Long. cell. lo-5-l7'3 /x ; lat. cell. 7-5-9 it. 



Hah. On trees among mosses, summit of Trois Pitons (4500 ft.), 

 Dominica. Nos. 903 and 90i. On Bow-wood Hills (1580 ft.), 

 St. Vincent. (8-12-91.) No. 23. 



7. M. CHLAMTDOSPORUM, J)e 5^/ry. (Co??j.'p. 7o ; Cooke, Brif. 

 Desm. p. 47, pi. 18. f. 14; JVest, Freshw. Alg. of W. Ireland in 

 Journ. Linn. Soc. vol. xxix. p. 131, pi. xxiv. f. 8.) 



Long. cell. 19-23 fi ; lat. cell. 12-5-14-5 ju. 

 Sab. On trees among mosses, summit of Trois Pitons (4500 ft.), 

 Dominica. Nos. 903 and 904. 



8. Tetmemoeus l^vis, Ealfs. {Brit.Besm. p. 147, t. 24. f. 2.) 

 Long. 57-5-65 ;u; lat. 19-20^ ; lat. isthm. 17-5-18-5^. 



Hah. In mud, warm stream, crater of Grrande Soufriere, Do- 

 minica. No. 883. 



9. CosMAEiUM PSEUDOPTRAMiDATTJM, Lund. (Desm, Suec. 

 p. 41, t. 2. f. 18.) 



Long. 46-48 /x ; lat. 24-25 /z ; lat. isthm. 9-5-12-5 fx. 

 Hah. On damp wall of dam, Sharp's Eiver, St. Yincent. 

 'No. 477. 



*STENONOTrM, Nordst. in Wittr. et JS'ordst. Desm. et OS dog. in 

 Ital. et Tyrol, p. 32, t. xii. f. 8. Forma mince, JRacih. {Desmidya 

 IV podrozy na ohlo ziemi, p. 4, t. i. f. 32). (PI. XIY. fig. 25.) 



Long. 36-36*5 /x ; lat. 23-24 ^, ; lat. isthm. 6-5 fx ; crass. 

 13-5 yu. 



Hah. With the typical form, but much more abundant. 



10. C. OBLIQUUM, Nordst. {JBidrag till k'dnned. am Sydligare 



r2 



