THE SESSILE BARNACLES. 



275 



There are no records from the equatorial and southern Atlantic, 

 Antarctic, or Indian Oceans. 



In the Pacific C. diadema is widely spread from Bering Sea, 

 Japan, and California south to New Zealand, Tonga, and Chili 

 practically the whole Pacific Ocean. 1 



Dr. W. H. Dall notes that " this species has been obtained from the 

 Humpback (Jfegaptcra versabilis) from Bering Strait to the Gulf 

 of California. It is especially abundant on the flippers and on the 

 underlip of these animals." Captain Scammon in his interesting 

 book on Marine Mammals has given a figure of the humpback whale 

 showing the areas chiefly infested with barnacles the underlip and 

 throat, front edges of the fins, and the flukes. The opercular mem- 

 brane in the living barnacle is brown, the "hood" slightly purplish. 



CORONULA REGIN^E Darwin. 

 Plate 64. 



1854. Coronula regime DARWIN, Monograph, p. 419, pi. 15, fig. 5; pi. 16, 

 fig. 4. 



Distribution. Northern Atlantic and Pacific Oceans, on hump- 

 back wales (Megaptera). 



Shell convexly-conic or depressed-conic, with flattened parietal 

 ribs having crenated edges and beautifully striated and granulated 

 surfaces (pi. 64, figs. 1, 3). Eadii not exceeding one-fifth the thick- 

 ness of a compartment (pi. 64, fig. 1). Body-chamber cup-shaped, 

 the basis much smaller than the orifice. Eibs in the base branching 

 irregularly, as in C. diadema, not symmetrically on both sides of the 

 sutures as in C. complanata. Terga wanting. 



Diameter 65 mm.; height 19 mm. (Unalaska). 



1 Weltner has materially enlarged our knowledge of the southern range of this barnacle, 

 from the rich series in the Berlin Museum. 



