288 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



Family SoHeriaceae 



Genus EUGHEUMA J. Agardh 

 Eucheuma uncinatum S. & G. 



Setch. & Gard., 1924, p. 748, pis. 67, 68. Eucheuma Johnstonii S. & G., 

 1924, p. 748, pi. 25, fig. 42, pis. 65, 66. 



A re-examination of the types of Eucheuma uncinatum ( AHF no. 64) 

 and E. Johnstonii (AHF no. 65) together with specimens collected re- 

 cently has aroused a question as to the distinctness of the plants so classi- 

 fied. The type specimen of E. Johnstonii appears under the same collec- 

 tion number (J. 84) as a specimen cited under E. uncinatum. The mate- 

 rial from Mazatlan resembles the type of E. Johnstonii much more than 

 that of E. uncinatum. Recent collections have shown further variation in 

 the degree of branching of the fructiferous ramuli, and this variation is 

 now considered to account for the differences exhibited by the two type 

 specimens. 



Eucheuma uncinatum is evidently quite abundant in the Gulf, judg- 

 ing from the several collections, especially during the spring and summer 

 months. It is a rocky shore inhabitant of the lower littoral zone. J. 28, 

 San Francisquito Bay, June; D. 434, San Esteban Island, Feb.; J. 54, 

 April; J. 80, Isla Partida, July; D. 208, Angel de la Guardia Island, 

 Jan. (very young) ; J. 84a, July (mature) ; J. 86, San Lorenzo Island, 

 June; D. 102, Turner's Island, Jan.; J. 88b, Pond Island, June. 



Genus AGARDHIELLA Schmitz 

 Agardhiella tenera (J. Ag.) Schmitz 



Schmitz, 1889, p. 442; Harvey, 1852, p. 121, tab. 23A (excl. syn.) ; 

 B0rgesen, 1915-20, p. 361, fig. 355. 

 This species has been collected only on the tropical outskirts of the 

 Gulf, a few examples being taken in the dredge from 40-meter depth off 

 San Jose del Cabo, H. 612, August. They are rather slender examples of 

 this species but are quite typical in both habit and structure. They reach 

 16 cm. in height. 



Agardhiella mexicana sp. nov. 

 Plate 69, Fig. 1 



Frondes 10-14 cm. altae, cylindricae, radiante multifarieque ramosis, axi per- 

 currente deunte, 1.1-1.5 mm. diam., apicibus curte attenuatis, acutis; ramis ultimis 

 tenuibus, acutis; medulla parva fibris longitudinalibus composita; tetrasporangiis 

 zonatis, in corticis subsuperficiem ; partibus sporangiiferis projecturis copiosis 

 indutis. 



