THE SESSILE BARNACLES. 



89 



BALANUS AMPHITRITE Darwin. 



1789. t Balanus radiatus Brucjuiere, Encycloi)C(lie m^lhotlique, p. 108. 



1790. ? Lepas purpurea Spengler, Skrivter af Naturhistorie Selskabet, vol. 1, 

 p. 172. 



1795. Lepas balanoides Linnaeus, Poli, Testacea utriusque Sicilian, p. 23, pi. 5, 



figs. 2-7. Not of Linna?us. 

 1815. Lepas raf/iataWooD, General Conchology, pi. 7, fig. 7. 

 1815. 1 Lepas minor Woon, General Conchology, pi. 7, fig. 6. 

 1854. Balanus amphitrite Darwin, Monograph, p. 240, with varieties communis, 



vennstus, pallidus, niveus, modestus, stutsburi, and p. 241, var. obscurus, 



variegatus, and cirratus. 

 1897. Balanns amphitrite Darwin, Weltner, Verzeichnis, p. 2G4. 

 1907. Bulwms carenatus Gruvel, Mem. Asiatic Soc. of Bengal, vol. 2, No. 1, p. (5. 

 1913. Balanus amphitrite Darwin, Hoek, Siboga-'Expeditie, Monographic 316, 



p. 107, with var. malayensis, p. 172, pi. 14, figs. 8-17. 



Distrihuiion. — Tropical and wami temperate seas. 



Next to B. tiniinnahiilum , this is the most widely distributed 

 Balanus, and it is also variable with numerous races. I have 

 attempted a revision of the American forms only. The concave 

 carina and notched scutum wliich characterize B. carenatus are 

 inconstant features in ampliitrite; in fact, that form of carina is 

 occasionally assumed by almost any Balanus. Wliether carenatus is 

 vaUd as a variety of ampliitrite can be ascertained only when a revision 

 of the oriental forms of the species is undertaken. 



The typical form of B. ampliitrite is that wliich Darwin called var. 

 communis, and figured on plate 5, figures 2e, 2li, 21. Tliis form is a 

 common barnacle in the PliiUppines. 



In some PliiUppino forms of ampliitrite the adductor ridge of the 

 scutum is very much reduced, making a close approach to the condi- 

 tion found in B. alatus and B. minutus of Hoek. These forms will be 

 illustrated in a report on Philippine barnacles now in preparation. 



Loralitv. 



Sicily 



Macao, China 



Kowloon, China 



Near Penang. 



Singapore 



Hull of barque from Straits of Malacca . 



Calcutta 



Dagupan, Luzon 



Cavite, lAizon. 



Manila Bay, Luzou 



Do 



Subig Bay, Luzon 



Dagupan, Union, Luzon 



Reef opposite Cebu 



Oton Beach, Panay 



Mantaguin Bay, Palawan 



Panubatan, Mindanao 



Batavia, Java. 



Tamandjaija, Bantam, Java 



Hawaiian Islands 



Pearl Harbor, Oahu... 



Collector. 



Isaac Lea coll . . 



Dr. B 



Albatross 



E. Deschamps. 



do 



Jeffreys coll 



Isaac Lea coll.. 



Albatross 



do 



do 



Dr. Bartsch 



do 



do 



do 



do 



do 



do 



Bryant and Palmer . 



do 



Wm. A. Brvan 



H. A. Pilsbry 



Notes. 



Shore. 



Ship's bottom. 

 On shells and ship. 

 Outside breakwater. 

 On Strombus. 



On twigs. 



Shore, on bamboo. 



On a reed. 



On Anomia bed. 



