282 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



Genus POLYOPES J. Agardh 

 Polyopes sinicola S. & G. 



Setch. & Gard., 1924, p. 784, pi. 28, fig. 61, pi. 42b. 



J. 38, growing on rocks in lower littoral and upper sublittoral belts, 

 Los Angeles Bay, June; J. 85, Isla Partida, July; J. 84d, Angel de la 

 Guardia Island, June. Not recently collected. 



This species is undoubtedly a summer annual, judging from the abun- 

 dance of collections made by Johnston at several stations during the sum- 

 mer and its complete absence from the winter collections. 



Genus PRIONITIS J. Agardh 

 Prionitis Sternbergii (Ag.) J. Ag. 



J. Agardh, 1851, p. 190; Kylin, 1941, p. 10, tab. 2, figs. 6, 7. Sphaero- 

 coccus Sternbergii C. Agardh, 1822, p. 275. Grateloupia Stern- 

 bergii var. versicolor J. Agardh, 1847, p. 10. Grateloupia versi- 

 color J. Agardh, 1851, p. 181. 



Kylin has recently re-examined the types of Prionitis Sternbergii and 

 Grateloupia versicolor and has arrived at the conclusion that the two are 

 identical. 



Growing on rocks in upper sublittoral belt, J. 100, Georges Island, 

 April; J. 119, Tortuga Island, June; J. 6, San Marcos Island, June; D. 

 537b, 539d, in rock pockets, middle littoral, Agua Verde Bay, Feb.; D. 

 727, lower littoral. Turner's Island, July (young). 



Agreement is good between some of Johnston's collections and Kylin's 

 illustration of the type of Prionitis Sternbergii. The narrowness of the 

 pinnae compared with the usually lobate ones of P. abbreviata is one 

 point of distinction. The main branches of the latter are also blunt-tipped 

 lanceolate, while those of the former are usually acute and somewhat 

 attenuated. 



One poor, encrusted specimen of the winter collection (D. 537b) 

 shows the pinnae characters as well as the habit features in general of 

 P. Sternbergii and may tentatively be recorded as a winter occurrence of 

 this species in the southern Gulf. J. 6 undoubtedly represents a typical 

 summer form. A comparison of the known records suggests that P. Stern- 

 bergii is typically a warm-water species extending south along the central 

 coast of Mexico, while P. abbreviata seems to be favored by cooler waters. 



