Howe : Phycological studies 93 



more pointed than in the Guadeloupe plants. No connecting* 

 forms between our jjii and 5J/o 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 ^. 

 polyphysoides have a somewhat intermediate appearance, we can- 

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

 form of this species. 



w 



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, estlpitate, 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, 40-110/-^ long, 33-37 />« in average maximum 

 diameter in surface view, truncate or very sHghtly 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 i.] 



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. 5524., type (11 December, 1907, M. A. H.), 

 and nos. ^^g2 and 550^; Great Ragged Island, no. 5810 ; and 



947 



A 



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



