NO. 10 DAWSON : MARINE ALGAE, GULF OF CALIFORNIA 213 



Caulerpa racemosa var. uvifera (Turn.) W.-v. B. 



Weber-van Bosse, 1898, pp. 360, 362, pi. XXXIII, figs. 6, 7. 



One collection of very abundant material made at San Gabriel Bay, 

 Espiritu Santo Island, agrees with the figures given by Madame Weber. 

 The plants were growing in mats several centimeters thick and sometimes 

 a meter or more in extent on the sand bottom of abandoned oyster-culture 

 ponds at the head of the lagoon. Here, the absolutely quiet water was 

 about 25° C. and abounded with these plants and schools of small tropi- 

 cal fish. 



D. 600, Feb. 



Caulerpa racemosa var. chemnitzia (Esper) W.-v. B. 



Weber-van Bosse, 1898, p. 376, pi. XXXI, figs. 5-8. 



A few rather dwarfish, immature specimens were collected on the 

 rocky shore of Agua Verde, D. 541, February. They show in general the 

 characters delineated by Madame Weber for the above variety, and, 

 though not entirely satisfactory, this designation will probably serve best 

 for the present material, which may not be at all typical. The plants form 

 mats about 7 cm. wide, thickly branched, the erect branches bearing as- 

 similating laterals which are very irregular as to both arrangement and 

 length. 



Caulerpa pinnata f. pectinata (Kiitz.) W.-v. B. 



Weber-van Bosse, 1898, pp. 290-291, pi. XXIV, fig. 3. 



The few specimens at hand correspond sufficiently well with the fig- 

 ures of both Kiitzing (Tab. Phyc. VII, tab. 5) and Madame Weber to be 

 designated under the above name. The plants have long, spreading, pros- 

 trate rhizomes with a few erect, pinnate branches up to 4.5 cm. high. 



D. 269, dredged in 12-22 meters over sand and coralline bottom, 

 Mejia channel, Puerto Refugio, Jan. 



Caulerpa sertularioides (Gmel.) Howe 



Howe, 1905, p. 576. Fucus sertularioides Gmelin, 1768, p. 151, tab. 15, 



fig. 4. Caulerpa plumaris Weber-van Bosse, 1898, pp. 294-295. 



This species is strictly a lagoon dweller in the quiet, warm waters of 



the southern part of the Gulf. It is found growing on the sand bottoms of 



the shallow bays and lagoons, and was collected several times by means 



