218 



BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



and indeed in the specimens of B. amaryllis which I have dis- 

 sected. B. olhus and B. tenuis seem to be sufficiently distinct for 

 specific separation. Unfortunately, the sutural edges and the basis 

 have not been sufficiently investigated in the small species closely 

 related to B. amaryllls, obtained by the Sihoga Expedition. We 

 know that in B. amarylUs the basis is porous, and the edges of the 

 radii are crenulated ; but these characters are unknown in B. hiTncc, 

 B. maculatus, and B. alhus. B. tenuis has a poreless basis and 

 smooth, thin edges of the radii, and is therefore quite disti.nct from 

 B. amaryliis. 



Albatross 

 Station. 



D4935 



D53n 

 D5313 



D5345 

 D51S1 



D5398 



D5142 

 D5143 

 D5141 



Locality. 



Oil Kagoshima Gulf, Japan. 



Slianghai, China 



Hongkong, China 



China Sea, vicinity of Honkong . . 

 China Sea, vicinity of Hongkong, 



off Pratas Island. 



Philippine Islands 



Malampaya Sound, Palawan, 



near Cliff Island. 



Off northeast Panay 



t'atbalogan, Samar 



Off Malocot Point, Verde Island 



Passage. 

 Off Mantacao Island, west coast 



Bohol. 

 Off G igantangan Island, between 



Leyte and Masbate. 



Siet Lake beach, Sulu Island 



Vicinity of Jolo,SuluArcliipelago 



do 



Off Sirun Island. Tawi Tawi 



group, Sulu Arcnipelago. 

 Vicinity of Siasi, Sulu Archipel- 

 ago. 

 Scarborough, England 



Dublin Bay, Ireland . 



Depth 



(fathoms) 



ss 



150 



135 



Sliore. 



114 



Collector. 



A Ihatross 



E. Deschanips . 

 Vv m. Stimpson. 



A Ibatross 



Dr. E. A. Mearns. 

 Albatross 



.do. 

 .do. 

 .do. 



.do. 



-do. 



E. A. Mearns. 



Albalross 



do 



do 



do. 



Bean.. 



Notes. 



North Pacific explor- 

 ing expedition. 



Dead; no opercular 

 valves. 



White: var. albus? 

 On reef. 

 On bark. 



Dead. 



Jeffreys coll.; from a 



ship. 

 With Cat. No. 1169. 



AUSTROBALANUS, new subgenus. 



Walls solid, poreless, their basal edges roughened w^ith irregular 

 points and ridges (except in B. vestitus) ; basis calcareous, some- 

 times extremel}^ thin; radii narrow or wanting; the sutural septa 

 irregular. Scutum with the adductor ridge long and strong, and 

 usually with crests for the lateral depressor muscle. 



Type. — Balanus imperator Darwin. 



The species composing this subgenus are veiy distinct from one 

 another. Further iuAestigation of the cirri is needed. 



KEY TO SPECIES. 



Interior of walls and valves of a fine violet color, the basal edge of wall 

 thick, with dense sculpture of fine ridges and points. Scutum with irreg- 

 ular crests for both rostral and lateral depressor muscles ; spur of tergum 

 rounded distally ; rather large B. imperator Darwin. 



