THE SESSILE BARNACLES. 



217 



Type. British museum. 



Distribution. China Sea and Philippine Archipelago, in deep 

 water. 



This species was originally taken by the Cluillcnger in the China 

 Sea west of Mindoro, and again by the S'lboga in the Suln Sea east 

 of northern Borneo. Its range is considerably extended by the 

 Albatross collections, recorded below. It is a truly deep-water 

 species, all of the records being betw r een 100 and 21-1 fathoms. 

 Though described from quite young and small examples, it attains 

 a considerable size, up to 35 mm. in rostrocarinal diameter, with a 

 height of 50 mm. In some places it is evidently abundant. 



BALANUS AMARYLLIS Darwin. 



1854. Balanits amaryUis DARWIN, Monograph, p. 279, pi. 7, figs Ga-Qc. 

 1902. BalanuK atnari/Uis disshnilis LANCHESTER, Proc. Zool. Soc., p. 369, 



with var. clarorittata (p. 370). 

 1905. Bdhinus ainari/Uis Darwin, GRTTVEL, Monographic cles CirrhipScles, p. 



250, with var. roseus and nivetis. 

 1913. Balanus amaryUis Darwin, HOEK, Kiboga- Expecl., Cirripedia, Monogr. 



Bib, p. 179, pi. 15, figs. 17-21 ; pi. 1G, figs. 1-4. 



Type. British Museum. 



Distribution. Southern Japan and India to northern Australia, 

 shore to over 100 fathoms. 



This species has an unusually great range in depth. The colored 

 form with cirri of characteristic short segments bearing two pairs 

 of large spines in the sixth cirrus is certainly found living from low 

 tide to over 100 fathoms (Albatross station 4935), probably to 150 

 fathoms; but the specimens from stations 5313, 5398, and from the 

 Verde Island Passage came up dead and empty, and may have floated 

 or drifted into deep water, especially those from the last locality, 

 which w T ere seated upon bark. 



B. amaryUis is quite variable, as Darwin recognized. This would 

 be expected in a common form which has a wide geographic and 

 bathymetric range. It appears to me possible that the forms de- 

 scribed bv Dr. Hoek as B. l)imcc and B.macirtat'iis are varieties or sub- 



/ 



species of B. amaryTlis, since their small differences in various de- 

 tails are such as one finds variable in all of the well-known species, 



