94 Howe : Phycological studies 



the sublittoral or elittoral zone than in the littoral, which perhaps 

 accounts for the rarity with which it has been collected. In re- 

 spect to the prevailing mode of fusion of the nodal filaments of the 

 central strand, H. lacrimosa has most in common with the H. Tuna 

 group, although there is sometimes also a secondary incomplete 

 fusion of the fused filaments or perhaps it would be better to say 

 that several or many (6-8 or more) filaments sometimes fuse im- 

 perfectly or for a very short distance into one. But in general 

 habit and form, 7/. lacrhnosa is little suggestive of H, Tuna or of 

 any other Halimeda known to us. The subcortical utricles are 

 chlorophylose and as a rule they become readily visible from the 

 exterior after decalcification. 



D. UDOTEA CONGLUTINATA AND UDOTEA CYATHIFORMIS 



Udotea conglutinata (Ell. & Soland.) Lamour. and U, cyathi- 

 /i?r;;//^Decaisnehave been quite commonly combined by students of 

 the Codiaceae^ a circumstance that easily is explicable, inasmuch as 

 Udotea cyathiformis is often scarcely more cyathiform than U. con- 

 ghitinata and inasmuch as some of the othermore obvious ordinarily 

 distinctive characters are subject to a considerable degree of varia- 

 tion. The writer has shared in this misconception, as he now 

 considers it, and has distributed at least one series of specimens of 

 U. cyathiformis * to various herbaria as Udotea conglufmata. But 

 with added experience with both living and dried specimens, it 

 has become increasingly evident that the Udotea conglutinata group 

 in the West Indies embraces at least two species. The Ellis & 

 Solander ''types" appear to have been lost, but in view of the 

 only figure of *' Corallina conglutinata'' given by them there can 

 be no reasonable doubt as to which of the two forms was before 

 them, even though their description is not altogether conclusive. 

 The probable type material of Udotea cyathiforniis Decaisne is repre- 

 sented in the herbarium of the Museum d'Histoire Naturelle in 

 Paris by two specimens now on one herbarium-sheet but fastened 

 to separate smaller sheets. Below the lower, less cyathiform of 

 the two specimens, is a ''Herb. Mus. Paris. *Mabel, on which is 

 inscribed in Decaisne's hand, '' Udotea Acetabulum D''^ lies des 

 Saintes, pres la Guadeloupe. M. D'Avrainville, 1842." The 

 specific name was apparently changed to cyathiformis on publica- 



* No, S97^^ from the Cave Cays, Exuma Chain, Bahamas. 



