85 



given descriptions of the two species in question but I do not 

 think he has found any more exact characters by means of which 

 the two species could be separated. The form of the carpogonial 

 branches he does not mention and a figure of the cystocarps 

 would have been very desirable. 



This species occurs both in sheltered and in more exposed 

 places. It has been found as an epiphyte upon Udotea flabellata 

 but it is attached mostly to stones, shells etc. It occurs in shal- 

 low water mostly; once I have taken it in a depth of about 20 

 meters. 



It has been found at St. Croix: Lime Tree Bay, Rust up Twist; 

 St. Jan: off Cruz Bay. 



Geogr. Distrib.: West Indies, Gulf of Mexico. 



Fam. 2. Chcetangiacece. 



Subfam. 1. Scinaieae. 



Scinaia Bivona. 



1. Scinaia complanata (F. S. Collins) Cotton. 



COTTON, A. D., New or little-known marine Algae from the East (Kew 

 Bulletin, 1907, p. 260) ex parte. SETCHELL. W. A., The Scinaia Assemblage 

 (University of California Publications, vol. 6, no. 5, 1914, p. 100). 



Scinaia furcellata var. complanata Collins, in Phyc. Bor. Am., Fasc. 17, 

 no. 836, 1901; Rhodora, vol. 8, p. 110, 1906. 



Scinaia furcellata Harvey, Nereis Bor. Am., part 2, p. 136 (ex parte). 



var. intermedia n. var. 



A var. typica pra3cipue differt fronde angustiore cylindrica, 

 axi centrali conspicua. 



In several respects the specimens found show very essential dif- 

 ferences from SETCHELL'S description, 1. c., that I have no hesitation 

 in considering them as representing a new variety. 



The specimens (Fig. 93) reach a length of 8 cm. They all 

 have a narrow frond the diameter of which reaches about 1 2 mm 

 only, resembling as to this character the narrow specimens men- 

 tioned by SETCHELL. 



As to the question whether these narrow specimens are flat- 

 tened or not SETCHELL was not successful in solving the question 

 with certainty only having dried material at his disposal. He 

 writes: "While it is difficult to be absolutely certain whether the 

 narrow forms are flattened or not, they seem to be so." I have 



