308 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



known; fronds mostly 2-3 mm. wide above, distantly subdichotomously 

 branched in one plane, the segments sharply ascending; axils a narrow V; 

 branches originating at very apex by development of pairs of primordia 

 from the multicellular apical meristem, elongation retarded at apex and 

 consequently 4-6 pointed growing tips are common and conspicuous; 

 fronds commonly 200 /jl thick, of a single cortical layer of small cells, 

 sharply angular in surface view, flattened in cross-sectional view; medulla 

 of large, thin-walled cells; proliferations frequent by superficial out- 

 growths, at first very slender, 200-250 fi, soon becoming flattened and as- 

 suming the general habit of primary axes, though much more slender and 

 delicate throughout; fertile material unknown. 



Type : D. 367-370, in 22 meters over sandy bottom, Tepoca Bay, 

 Feb. 4, 1940. Herb. AHF no. 46. 



D. 432, dredged in 124-152 meters 4 miles off Pond Island, Feb. 5, 

 1940. 



In habit and structure these plants are nearest to Rhodymenia, but 

 without reproductive material the generic status can be considered only 

 tentative. 



Family Ghampiaceae 



Genus LOMENTARIA Lyngbye 



Lomentaria catenata Harvey 



Plate 74, Fig. 1 



Harvey, 1857, p. 331 ; Okamura, Icones Jap. Algae, I, pi. 26. Corallopsis 

 excavata Setch. & Gard., 1924, p. 756, pis. 23, 44, 48. 



J. 21, Tortuga Island, June; J. 59, Isla Partida, July; J. 129, oppo- 

 site Pond Island, July; D. 100, on reef at Turner's Island, Jan.; D. 449, 

 middle littoral, San Esteban Island, Feb. 



Of the five collections from the Gulf of California, including both 

 tetrasporic and cystocarpic material, all seem indistinguishable from the 

 hitherto Japanese species Lomentaria catenata. The condition of some of 

 the dried material of Johnston's collection in 1921 was such that it was 

 misinterpreted by Setchell and Gardner and published by them as a new 

 species, Corallopsis excavata. There is, however, little or no question but 

 that the Gulf specimens are virtually, if not precisely, the same as the 

 Japanese specimens of L. catenata in the Herbarium of the University of 

 California. 



Lomentaria hakodatensis Yendo 

 Plate 75, Fig. 2 



Yendo, 1920, p. 6. Lomentaria sinensis Howe, 1924, p. 139, pi. 1, fig. 1. 

 Hooperia Baileyana Setch. & Gard. (not of J. Agardh), 1930, p. 

 153. 



