254 



Tetraclita porosa var. (i) communis, according to Gruvel \ is represented in the 

 Calcutta Museum by specimens from Muscat (Arabia). 



Tetraclita porosa var. (3) virirfis, according to Borradaile ", was collected by Stanley 

 Gardinkr at Rotuma, N.'N.W. of the Fiji Isds. 



Tetraclita porosa var. (4) ruóescens, according to Weltner 8 , is found at Nagasaki. 



Tetraclita porosa var. (7) patellaris, according to Gruvel 1 , was collected in the Bay 

 of Beneal, near the Andaman Isds. 



Tetraclita serrala Darwin, according to Annandale *, was found off Ceylon, on a 

 dead Hetcropsammia. 



Tetraclita rosca Darwin, according to Weltner 3 and myself (Challenger-Cirripedes) 

 occurs on the coast of New South Wales. 



Tetraclita p7irpurascens (Wood), according to Weltner 5 , was collected by Schauinsland 

 in Cook Strait (New Zealand) and is also represented in the Berlin Museum 3 by specimens 

 from Auckland and New South Wales. 



Tetraclita costata Darwin, according to Weltner 3 , was collected at Larentuka. 



Tetraclita vitiata Darwin, according to the same author 3 , was also collected at Larentuka. 



Tetraclita coerulescens (Spengler) which the Challenger collected at Zamboanga (Philip- 

 pines), occurs also, according to Weltner 3 , at Amboina, Larentuka and Singapore. 



If we take the sixth Province with the limits as proposed in my Challenger publication, 

 the number of species there occurring would be five : T. porosa, serrata, costata, vitiata and 

 coerulescens. Tetraclita porosa would, moreover, be represented in the said province by the 

 var. (7) patellaris, this variety being found in the Bay of Bengal. 



This genus is represented by four species in the collections made during the cruise 

 of H. M. S. "Siboga" : T. porosa (Gmelin), T. costata Darwin, T. vitiata Darwin and T. coe- 

 rtilescens (Spengler). They were collected on tidal rocks, during reef exploration, etc. 



1. Tetraclita porosa (Gmel.). 



Darwin, Ch., Monograph. The Balanidae, Verrucidae, etc. 1854. p. 329, pi. X, fig. ia — lm. 



This is a very common species with a wide distribution. It varies greatly in external 

 appearance and Darwin therefore distinguished eight varieties, some of which, however, differ 

 only in the colour of the preserved portions of the outer lamina of the shell. As this colour 

 no doubt suffers considerably under the influence of the spirits in which the objects are pre- 

 served, in many cases it is hopelessly difficult to make out whether they belong or not to 

 one of these varieties. 



1 Gruvel, A., Cinhipèdes operculés de 1'Indian Museum de Calcutta. Memoirs of the Asiatic Society of Bengal. II. N° I. 

 p. I — 10. 1907. 



- BORRADAILE, L. A., On some Crustaceans from the South-Pacific. Part V. Proceed. of the Zoolog. Soc. of London. 1900. p. 795 — 799. 



3 Weltner, W., Verzeichnis der recenten Cirripedienarten. Arch. f. Natui'gesch. Jahrgang 1897. Bd. I. S. 227 — 280. 



4 Annandale, N., On the Cirripedia. In: W. A. Herdman's Report on the Pearl Oyster Fisheries of the Gulf of Manaar. 1906. 



5 Weltner, W., Cirripedien der Ergebnisse einer Reise nach dem Pacific. Zoologische Jahrbücher. XII. 1899. S. 441 — 447. 



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