Acasta funiculorum Annandale 1 , 1906, Gulf of Manaar, Ceylon. 

 Acasta Dofieini Krüger 3 , 191 1, East-Asia. 



One of the species described by Darwin {A. undulata) is known as occurring only in 

 a fossil condition, viz. in Coralline Crag (Sutton). The number of known living species, therefore, 

 at present would be twelve, or fourteen with the two described as new in the present paper. 



In the 6 th province, including the Malay Archipelago, this genus is richly represented; 

 nine species are now known from this region : 



Acasta sulcata Lamarck : Philippines, collected by Cuming, according to Weltner 3 . 



Acasta laevigata J. E. Gray : Philippine Archipelago (Darwin, Weltner). 



Acasta glans Lamarck : Pepela Bay, Rotti Island ; Java Sea. 



Acasta fencstrata Darwin : Philippine Archipelago (Darwin). 



Acasta purpurata Darwin: Philippine Archipelago, Sumatra (Darwin). 



Acasta sporillus Darwin: Sooloo (Sulu?) Islands, East Indian Archipelago (Darwin). 



Acasta funiculorum Annandale : Gulf of Manaar, Ceylon. 



Acasta conica n. sp. : Spermonde Bank, Macassar. 



Acasta nitida n. sp. : Java Sea. 



Of the other known species, A. cyathus Darwin, according to Weltner 3 , occurs on the 

 coast of Australia, and A. Dofieini Krüger in East-Asian waters. These species, or one of them, 

 may perhaps, be found also in the East Indian Archipelago. As most of the species live quite 

 embedded in sponges, they are, of course, easily overlooked; a careful examination of sponges 

 to see if they are inhabited by species of this genus might show that more forms of it are still 

 living, and that the known species have a wider geographical range than is at present supposed. 



Very little is known of the geographical range of most species and several are known 

 to occur at only one particular locality. A. spongites Poli is said to occur on the South Coast 

 of England, in the Mediterranean, near the Cape of Good Hope, and, according to Weltner, is 

 found also at Hakodate (Northern Japan). Of late (1911), Pilsbry has described a so-called sub- 

 species of this species as occurring off Kagoshima Gulf, Japan, at 185 meters. This species 

 would therefore be a fair instance of world-wide distribution as occurring in this genus. But 

 it would be necessary to settle, by comparative study of sufficiently rich material, that the 

 specimens from these different localities really belong to the same species. 



Most species seem to live only in shallow water. A. striata Gruvel is the only known 

 deep-sea species of this genus: it is an Atlantic species collected by the Erench cruiser 

 "Travailleur" at a depth of 400 m. Pilsbry's subspecies of A. spongites Poli would represent, 

 however, another case pf an Acasta-spec'ies occurring in deep water (185 m.). Annandale 

 does not say at what depth his new Ceylon species (A. funiculorum) was collected, but, 

 most probablv, it was found near the coast and in shallow water (coral reefs off Ceylon, on 



1 ANNANDALE, N, On the Cirripedia (of the Report on the Pearl Oyster Fisheries of the Gulf of Manaar) Ceylon Pearl 

 Oyster Fisheries. Supplement. Report. N° XXXI. 14 pag. 1906. 



- Krüger, Paul, Beitrage zur Naturgeschichte Ostasiens. Beitrage zur Cirripedien-fauna Ostasiens. Abhandl. Akad. Wiss. 

 München. Math.-phys. KI. Supplement-Bd. 2. N° 6. 72 S. 4 Taf. 1911. 



3 WELTNER, W., Verzeichnis der bisher beschriebenen recenten Cirripedienarten. Arch. f. Naturgesch. 1897, Bd. I. 



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