178 



BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



Opercular valves thin, much as in B. c. curviscutum, but the 

 scutum is higher, not so wide, and the spur of the tergum is truncate 

 at the end. 



Carinorostral diameter of base, 7.5 mm. ; height, 13 mm. 



The maxilla has five spines below the upper great pair, about as 

 in B. c. curviscutum. 



Labrum (fig. 50</) with three teeth on each side. 



First cirrus with rami of 14 and 9 segments, the shorter ramus 

 about half as long as the longer. Cirrus ii has nearly equal rami of 

 10 segments. Cirrus iii with unequal rami of 11 and 9 segments. 

 All but the first and last segments of the outer ramus bear short 



FIG. 56. BALANUS CRENATUS DELICATUS, TYPE, a, IST CIRRUS, ft, FIFTH SEGMENT ANTE- 

 RIOR KAMI'S OF CIRRUS III. C, 1STH SEGMENT OF CIRRUS VI. d, LABRUM. 



recurved spinules near the anterior or distal borders. (Fig. 56&, part 

 of fifth segment of cirrus iii). The segments of the inner ramus are 

 not so copiously spinose. The sixth cirrus has 8 pcdrs of spines on 

 the median segments (fig. 56c). 



The penis is nearly twice as long as the posterior cirri, and has a 

 few hairs near and at the end. There is an acute basidorsal point. 



This race resembles B. c. curmscutum in the main, but differs by 

 the greater number of spines on the posterior cirri, and of spinules 

 on the third cirri, as well as by the wider truncate spur of the 

 tergum. 



BALANUS GLANDULA Darwin. 

 Plate 43. 



1854. Balo mis glandula DARWIN, Monograph, Balanidre, p. 265, pi. 7, 

 figs, la, 1&. 



1909. BaJiinim c-rcnatus Bruguiere, PILSBEY, Bulletin of the Bureau of Fish- 

 eries, vol. 29, p. 75, pi. 14, figs. 4-9. 







Type. British Museum, from California. 



Distribution. Southern California to the Aleutian Islands ; shore, 

 chiefly in the intertidal zone. 



