I • bove, from a cuneate bas< obovate, mon or less pi 



liici surfaci verj minutely and obscurely cellular. 



ond filamenl . i in diameter, approximated, rarely contiguous, pluriseriate, bearing 



■ •; long occasionally iip to i8o/jt at base of frond) witli 

 r divided lobately, inflated .md embossed with 6 20 low rounded prominences 

 n the incrustation ; see p. 103); supra-dichotomial constrictions uneven 



bearing long stalked lateral appendages, each 2 3 times dichoto- 

 d then subdivided shortly and irregularly, terminating in numerous abbreviated 

 ipices I igs 18, 22a, ::/', 63 — 65]. 



63, 64) is se closely allied t<> U. argentea that we long regarded 



ly a variety of that species, luit wc now feel that it is specifically distinct. Not only 



distribution widely different from that of / '. argentea, luit it presents differences of struc- 



ture both characteristic and constant. The frond-filaments are always narrower in diameter, and 



their lateral appendages always shorter, bearing capitula more divided and almost botryoidally 



lobulate figs. 22a, 22 />). 



The type <<\ this species was collected by the "Challenger" Expedition and is in the 

 British Museum (fig. 63). It is destitute of a stipes, as also are the two other specimens 

 mounted with it. Possibly all three may be unusually large proliferations tuin off the primary 

 plant by the dredge; or mi the other hand they may lic three distinct fronds severed from 

 their stalks in the same way. Dr. Fleming's plant is stipitate and very proliferous; it came 

 trom an unknown locality in the West Indies. We have reccntly seen three other complete 

 specimens of ('. occidentalis \ they were collected at St. Jan by Dr. F. Börgesen ; and one of 

 them we have figured (fig. 64 



The average size of the plants is smaller than that of ( '. argentea. The tendency to 

 proliferation, which is possibly due to injury or other external influences, is a striking feature 

 common to all the complete specimens that we have seen. 



The distribution of ('. occidentalis appears to be very limited, being confined to the 

 1 lanish West Indies. so far as is shown by our material. 



13. Udotea verticillosa \. & E. S. Gepp 



in Journal of Botany vol. XLVII. 1909. p. 269. 

 Syn. Udotea conglutinata Dickie in Journ. Linn. Soc. (Hot.) XIV. 1875 p. 312, pro parte. 

 tea flabellata Dickie loc. cit. 

 Udotea conglutinata Munay in Journ. of Bot. XXVII. [889. p. 238 (pro parte). 

 Udotea flabellata Murray Inc. cit. (pro parte). 



Hab. ATLANTIC. West Indies, St. Th.>mas. 5 15 fathoms, " Challenger" Expedition, in Herb. Mus. 

 Brit.! and Herb. Kew! St. Thomas, F. Börgesen, herb. a os 1019 (15 fathoms)!, 1137 (20 

 fathoms)!, 1173 (15 fathoms)!, — St. Jan, F. Börgesen, herb. n°s 1707'. 1823!, \$jy (15 

 fathoms)!, 1915!, 2101!, 221 1 !, 22^'. 



boul 1 cm. high, calcified, stipitate. Stipes simple, up to about 4 cm. (usually 

 1 mm. thick, apex sometimes flattened om and cuneate. 



