298 CATALOGUE OF MAKINE ALG^ OF WEST INDIAN REGION. 



Explanation of Plate 291. — The letter "a" indicates a front view, *'b" a 

 side view, "c" an end view (or from base of semicell). Figs. 15, 16, and 17 are 

 to illustrate the article on ' The Fresh- water Algae of Maine ' in this Journal for 

 last July. All the figures have an amplification of 400 diameters. — Fig. 1, 

 Cosniarium eboracense, n. sp. 2, C. cijcUcum Lund., var. angulatum n. var. 3, 

 Penitnn Brehissonii Kalfs, with a parasite. 4, Cosmarium granulatum n. sp. 

 5, Tetmemorus gramdatus Ealfs, an abnormal form, 6, Gonatozygon l(Pve, n. sp. 

 7, Staurastnnn acarides Nord., var. hexagonum, n.var. 8, S. acarides Nord., 

 var. eboracense, noY.y&v. 9, Arthrodesmus bifidus Breb., var. trxaicatxis, n.ydkX. 

 10, Staurastnnn margaritaceum Meneg., an abnormal form. 11, A nine-ended 

 form of the last. 12, S. avicula Breb., var. aciculiferum, n. var. 13, A form of 

 Micrasterias Ainericana Halis, war. recta \Yo\le. 14, Cosmariuvi lepidum, n. sp. 

 15, Micrasterias pinnatijida Ealfs, var. trigona W. West. 16, Stai(rastrum 

 angulatum W. West, var. subangulatum W. West. 17, Sphcerozosma Aubertianiim 

 W. West. 



CATALOGUE OF THE MARINE ALG^ OF THE 

 WEST INDIAN REGION. 



By George Murray, F.L.S. 

 (Concluded from p. 262.) 



Geographical Distribution. 



I have constructed the following tables in illustration of the 

 distribution of the Algae occurring in the West Indian Region, 

 since this form of statement is at once shorter and clearer than any 

 other I could devise. The information thus conveyed will doubtless 

 interest the reader more than any part of the present Catalogue, as 

 it has so interested me in the making of it. It should be explained 

 that, to ensure accuracy, I have revised the statements of the 

 geographical distribution given under the species, with the result 

 that in some cases this distribution appears to be wider, while in 

 others I have found reason to doubt the statements of others and of 

 myself, adopted in the paper, which assign a wider field of occurrence 

 to these forms. The difficulty of giving an absolutely accurate 

 rendering of the case is very great, owing to the much-scattered 

 sources of information on the distribution of Algae, and I have in 

 all cases of doubt preferred to under-estimate the range of a species. 

 While there are errors in the tables beyond all question, I may 

 claim to have striven to reduce these to the lowest limit, and the 

 work of doing this, of tracing particular forms into the different 

 regions of distribution, and the labour of consulting the chaotic 

 literature of distribution, must be my excuse, if such errors be 

 deemed by any one to be unwarrantable. I hope I shall not be 

 considered to be taking credit to myself in stating the matter thus, 

 but that it will be understood as part of an apology. 



