368 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93 



Chelonibia testudinaria (Linnaeus). 

 Corom.Ua diadema (Linnaeus). 

 Chthamalus anisopoma Pilsbry. 

 Chthamalus fissus Darwin. 

 Lepas anserifera Linnaeus. 



Further collecting in this region will undoubtedly increase tlie 

 number of known species of these crustaceans. No species of the 

 genera Scalpellum, Alepas, or Heteralepas 3 has been reported from 

 the Gulf of California, and only one species of Lepas and one species 

 of whale barnacles have been found. It seems possible that Balanus 

 tintinnabidum coccopoma Darwin, which extends from Panama to 

 Mazatlan, might occur in this area. Also two species, Balanus or- 

 cutti and Balanus regal U? described by Pilsbry (1916), and each 

 known from only one locality, on the west coast of Baja California, 

 should be looked for in the Gulf. 



Genus BALANUS Da Costa 



BALANUS AMPHITRITE INEXPECTATUS Pilsbry 



Plate 31, Figures 15-16 



Balanus amphitrite inexpectatus Pilsbry, 1916 ; Nilsson-Cantell, 1933; Steinbeck 

 and Picketts, 1941. 



Localities: Estero de la Luna, Sonora, April 10, 1940, and Estero 

 de Agiabampo, Sonora, April 11, 1940, on Stro/nbus gracilior Sowerby. 



This species was described by Pilsbry (1916) from a series of about 

 40 specimens growing on oystershells from the Gulf of California. 

 Nilsson-Cantell (1933) reported B. a. inexpectatus from Bonaire 

 and figured two terga to show the variation in the short, wide spur 

 and also pointed out variations in the color of the wall. Specimens of 

 B. a. inexpectatus identified by Ira E. Cornwall were collected by 

 Steinbeck and Ricketts on the Mogote sand flats. La Paz Bay. 



The specimens from Sonora are for the most part small; the largest 

 is 13 mm. in diameter. The maximum diameter listed by Pilsbry is 15 

 mm. and by Nilsson-Cantell, 17 mm. They are described as u large 

 barnacles" by Steinbeck and Ricketts. Unless eroded the parietes are 

 dark with white lines as in the type, except in a few small specimens, 

 which have light-colored parietes. The radii differ from Pilsbry's de- 

 scription. They vary in color from tan to the dull purple of the walls 



• Steinbeck and Ricketts ( 1 1> 4 1 ) erroneously state in their bibliography under Pilsbry 

 (1907) that Heteralepas quadraia was reported from the Gulf of California by Aurivillius. 

 Gruvel (1905) reported Heteralepas quadrata (Aurivillius) on Lepas hillii calif orniensia 

 Gravel from Lover ('nlifornia. 



* Von Kolosvary (1040) figures the rostrum, scutum, and tergum of a barnacle from 

 Mollendo, Peru, which he calls Balanus coneavus regalis Pilsbry. 



