20i> 



HULLKTIN OF THE 15UREAU OF FISHERIES. 



Length of the wall at base 11.5 mm., breadth 12 mm., 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 al)ove. the margin excavated 

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

 8 spines, the lower ones stronger, and there is a tuft of line 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 al)OUt twice the length of the shorter ramus, which is composed of 11 segments, all 

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

 re.spectively, al.so strongly protuberant on 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. Tliere 

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

 Balanus, closelv annulated. 



Kn;. ;i. Balaniis fio.':. a. First cirrus: B, si.xth t-irnis ;in<i ppnis; i.ma.xillji: i'. mjiniiibl.^ 



Tj-pe no. 32-105, U. S. National Museum, from Albatross station 4658, Point Pinos Light-House, 

 40 fathoms, region of Monterey Bay, on polyzoan colonies. Cotype, no. 32406 L'. 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, line gray sand. 



This flower-like barnacle su[)erficially resemljles B. amaryllis Darwin and B. corolUfonnh Hoek. but 

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

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

 section C, except Balanus 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 

 shape of the scutum and tergum. The moutli parts and cirri would seem to be much as in .B. spongicola, 

 judging from Darwin's description. Balaiius ^mrihis Darwin differs from B. Jlos liy its coloration, the 

 shapes of the opercular valves, and l)y various features of the cirri. 



The diverging apices of the terga are a prominent feature of JS. //os at all stages of growth. ■ Thespeci- 

 meitfrom station 4420 is very pale pink, almost white, externally. 



