Howe : Phycological studies 93 



more pointed than in the Guadeloupe plants. No connecting 

 forms between our j ,'// and SJ lo were observed and the two are 

 rather strikingly different in habit, but the specimens of the former 

 are infertile and as some of the Guadeloupe representatives of A. 

 polypliysoidcs have a somewhat intermediate appearance, we can- 

 not do otherwise, for the present, than to consider deltoidemn a 

 form of this species. 



C. A NEW HALIMEDA 

 Halimeda lacrimosa sp. nov. 



Dark gray-green in the younger parts when living, becoming 

 albescent or white with age, soon decumbent, weak and straggling 

 in habit, estipitate, 2-5 cm. in height or length, very strongly 

 calcified, the calcification soon involving the medulla and the 

 entire length of the peripheral utricles ; branching irregularly 

 dichotomous or trichotomous, largely but not wholly in a single 

 plane, the nodes in decumbent forms now and then rhiziniferous, 

 or somewhat stoloniferous : segments obovoid, pyriform, or sub- 

 globose, occasionally subterete, 1-5 mm. long, 1-5 mm. broad or 

 thick (those near base scarcely different or often a little smaller), 

 solid, firm, and stone-like, or the larger very often more or less 

 hollow or cavernose in the medullary region and easily crushed 

 on drying, the surface compact, smooth, and commonly nitent : 

 peripheral utricles mostly rather obconical, usually somewhat 

 flaring at surface, 40-1 10 /i long, 33-37 /^ in average maximum 

 diameter in surface view, truncate or very slightly rounded at apex 

 with apical walls often incrassate, retuse on drying, lateral walls 

 in contact for only ^-^ - -^^ their length but commonly coherent 

 on decalcification : utricles of the subcortical layer in a single 

 series, clavate-capitate, their subglobose or obovoid heads mostly 

 66-110//. in maximum diameter, each bearing 6-18 peripheral 

 utricles : filaments of the central strand fusing in twos, threes, or 

 rarely fours at the nodes, the resulting filaments sometimes again 

 incompletely fused in twos, threes, or fours : sporangia unknown. 

 [Plate 4, figure i ; plate 6, figures 3-1 1.] 



In the Bahama Islands, from near low-water mark down to a 

 depth, at least, of ten or twenty meters : Mariguana (near the 

 Southeast Point), no. 5^24, type (11 December, 1907, M. A. H.), 

 and nos. 54g2 and 550./ ,• Great Ragged Island, no. j8io ; and 

 Ship Channel Cay, no. jg47. 



A peculiar species, without close affinities among the species 

 of the genus hitherto described. It is apparently more common in 



