226 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



The labriim has two stout teeth on each side of the median notch 

 (fig. 72a). 



The palpi closely resemble those of B. hawaieiisis 



The mandible has four rather long teeth, and a trificl lower point. 

 There are small teeth abo^e and below the fourth tooth. The lower 

 margin bears a few long spines. There are a fcAV hairs on the upper 

 margin (fig. T2c). 



Cirrus i lias very unequal rami of 8 and 5 segments, the anterior 

 ramus nearly t"svice as long as the posterior. The segments are 

 slightly convex, but not protuberant. 



Cirrus ii has rami of 8 and 7 segments, the anterior ramus longer 

 by two segments. They are not protuberant. 



Cirrus iii is slightly longer than ii, but otherwise similar. 



Cirri iv to vi are much alike. Cirrus vi has rami of 16 segments, 

 which bear four pairs of spines (fig. 72&). 



The penis is longer than the posterior cirri, closely annulated, riot 

 hairy. I see no basidorsal point. 



About 40 presumably adult individuals, besides numerous young 

 ones, are seated upon a large sea-urchin spine. From the nearly 

 uniform size of the larger barnacles, and the remains of dead ones, 

 I conclude that they are adult. They are with one or two excep- 

 tions seated with the long axis conforming to that of the spine, and 

 all but five are headed the same way. 



The species has some resemblance to the much larger B. mald'wen- 

 sls Borradaile,^ but that species, as Avell as all the other East Indian 

 species of Solidobalanus, has a distinct basiscutal point on the 

 tergum, while in the present form the spur is confluent with the 

 scutal margin. The low, broad ribs of the parietes are also character- 

 istic. There are fewer spines than usual on the lower border of the 

 mandible. 



Subgenus ARMATOBALANUS Hoek. 



1913. Armato-BaJanns Hoek, Siboya-Expeditio, Monographie 31&, Cirri- 

 pedia, iip. 159, 162, 207. 



Small, conic Balani with calcareous basis; walls solid, poreless, 

 sharply and deeply costate Avithin. Sutural septa present. Scutum 

 with the articular ridge long, tapering below, adductor ridge moder- 

 ate or subobsolete ; no crests for the lateral depressor muscle. Tergum 

 Avithout distinct external furrow, the spur Avide, occupying one-third 

 to over half the basal margin, short, the end obliquely truncated. 



'^Balnniis maldivcnsis Borradailo, in The Fauna and Geosraphy of the Maldive and 



Laccadive Archipelagoes, vol. 1, 100^, p. 442, fig. 118. South Nilandu Atoll, Maldive group, 



on a twig of wood. See also Hoek yS'tSoj/a-Expeditic, Monographie, olh, p. 195, pi. 18, figs. 

 13-19. 



