64 >LLINS AND HERVET. 



i: L913, p. 1-7. I | I ollins, L909, p. U3; with broad, little 



proliferous fronds. 



eufolla ! . 1907, p. 359, fig. 6; 1913, p. 127, 



L01; Collins, L909, p. H ; '>: with narrow, proliferous Fronds; 

 Fain land, 1 >ec., < Collins. 



RASSiroLiA Ag. J. G. Agardh, L872, p. 13. Typical C. 

 mfolia has not been found here; forma laxior i> common, and is 

 apparently a well marked endemic form, not having been reported 

 elsewhere; forma mexicana is the common form of Florida and the 

 West Indie-, and though not rare in Bermuda is less common than 

 forma laxior. 



Forma laxiok (Weber) Collins, 1909, p. 413; P. B.-A., No. L919; 

 nnata forma laxior Weber, L898, p. _ )( .H ; ('. crasrifolia var. i 

 cana Alg. Am. Bor. Exsicc., No. 170. Walsingham, April, Hervey; 

 Hungry Hay, Tuckertown, Gravelly Bay, Pool by Moore's calabash 

 tree, Cliff pool, April, Harrington Sound. May, Collin-. 



Forma mexicana (Sond.) J. G. Agardh, L872, p. 13; Collins, 1909, 

 j>. 413; ('. mexicana Sonder in Ktitzing, 1849, p. 496; Harvey, 1858, 

 p. Hi. PL XXXVII. A; Gibbet Island, Bailey's Hay, Jan., Hervey. 



The form from Cliff Pool deserves special notice; Cliff Pool is a 

 name we have u>vd for a small but deep pool, near the S\Y. corner of 

 Harrington Sound, between Tucker's Hay and Green Hay. It has a 



Steep cliff On the side towards the sea; on the other side it is near the 



Sound, but separated from it by land considerably above it- l< 

 It evidently has underground connection with the Sound, the water 

 rising and falling somewhat with the tide. On the surface of this 

 pool, in April and May, 1912, was a floating ma— of algae, chiefly 

 ( rassifolia, C. racemosa and ('. sertidarioides. The stolons floated 

 on the surface, the fronds extending beside them, the tapering rhi- 

 zoids hanging straight down, sometimes reaching a length of _> dm.. 

 reminding one of the roots of a Lemna or Spirodela, on a larger scale. 

 Borgesen, 1 ■ »< > 7 , p. 344, classifies the Caulerpas under three types. 

 I The epiphytic or mud-collecting Cauperpas. (2) The sand and 



mud Caulerpas. (3) Rock and coral-reef Caulerpas. These three 

 types are represented in Bermuda, and we can now add a fourth, the 



floating Caulerpas. Evidently this form can occur only at a station 

 with considerable depth of water, not reached by surf, sheltered from 

 winds, and with no current. Specimens collected here in May 

 have been distributed a- P. B.-A., Nos. l s 7:i and 2021. The station 

 was revisited in August, 1913, but only a few bleached individuals were 



found; apparently the plants could not endure the intense heat of the 



midsummer sun. 



