202 



BULLETIN OF THE BUREAU OF FISHERIES. 



Length of the wall at base 11.5 mm., breadth 12mm., height 12 mm.; length of the aperture 8.5 mm. 



The mandibles (fig. 3, d) have three rather small but strong teeth and a bluntly irregular den- 

 ticulate lower projection. The maxillae (fig. 3, c) have two strong spines above, the margin excavated 

 below them, then becoming convex, the lower angle being broadly rounded. The edge bears about 

 8 .-pines, the lower ones stronger, and there is a tuft of fine bristles below the lower extremity. 



The first pair of cirri (fig. 3, a) have very unequal rami, the longer or anterior branch of about 23 nor- 

 mal segments, and about twice the length of the shorter ramus, which is composed of 11 segment.-, all 

 of them strongly protuberant on the forward side. The second pair of cirri has rami of 13 and 12 joints, 

 respectively, also strongly protuberant mi both branches. The third cirri have longer and more slender 

 rami of 16 and 15 joints, which protrude moderately in front. The anterior ramus is the longer. The 

 fourth, fifth, and sixth pairs of cirri are much more slender, long, and curled, the rami subequal. There 

 are about 36 joints in the branches of the sixth pair (fig. 3, b). The penis (fig. 3, B i is rather short for a 

 Balanus, closely annulated. 



Fig. 3.- BcUanus flos. \. First cirrus; b, sixth cirrus and penis; c, maxilla; D, mandible. 



Type no. 32405, I". S. National Museum, from Albatross station 4558, Point Pinos Light-House, 

 lo fathoms, region of Monterey Bay, on polyzoan colonies. Cotype, no. 32406 1 . S. National Museum, 

 from same station. A specimen on a broad seaweed from station 4420, off east point of San Nicolas Island 

 in 338 fathoms, fine gray sand. 



This flower-like barnacle superficially resembles B. amaryllis Darwin and B. corolliformis Hook, but 

 differs from both in important characters, more especially in the features of the basi . which place it in a 

 different section. There seems to be no very closely allied species among these referred to Darwin's 

 section 0, excepl I in In mis spongicola Brown, of the Atlantic which differs by the longitudinal sculpture 

 of the scutum, a feature upon which Darwin lays especial stress, and by various other differences in the 



sha] I the scutum and tergum. The mouth parts and cirri would seem to be much as in B. spongicola, 



judging from Darwin's description. Balanus pmcilus Darwin differs from B. flos by its coloration, the 

 shapes of the opercular valves, and by various features of the cirri. 



The diverging apices of the terga are a prominent feature of B.flos at all stages of growth. The speci- 

 men from station 4420 is very pale pink, almost white, externally. 



