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Tetraclita porosa var. (1) communis, according to GrvuveL', is represented in the 
Calcutta Museum by specimens from Muscat (Arabia). 
Tetraclita porosa var. (3) viridis, according to BorraDAILE*, was collected by STANLEY 
GARDINER at Rotuma, N.N.W. of the Fiji Isds. 
Tetraclita porosa var. (4) rudbescens, according to WELTNER*, is found at Nagasaki. 
Tetrachita porosa var. (7) fatellaris, according to GruveL', was collected in the Bay 
of Bengal, near the Andaman Isds. 
Tetraclita serrata Darwin, according to ANNANDALE‘, was found off Ceylon, on a 
dead Heteropsammia. ? 
Tetraclita rosea Darwin, according to Wettner® and myself (Challenger-Cirripedes) 
occurs on the coast of New South Wales. 
Tetrachta purpurascens (Wood), according to WELTNER®, was collected by ScHauINsLAND 
in Cook Strait (New Zealand) and is also represented in the Berlin Museum* by specimens 
from Auckland and New South Wales. 
Tetraclita costata Darwin, according to WELTNER®*, was collected at Larentuka. 
Tetraclita viteata Darwin, according to the same author’, was also collected at Larentuka. 
Tetraclita coerulescens (Spengler) which the Challenger collected at Zamboanga (Philip- 
pines), occurs also, according to WeELTNER*, 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: 7. forosa, 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”: 7. forosa (Gmelin), 7. costata Darwin, 7. vtiata Darwin and 7. coe- 
vulescens (Spengler). They were collected on tidal rocks, during reef exploration, ete. 
1. Tetraclita porosa (Gmel.). 
DARWIN, CH., Monograph. The Balanidae, Verrucidae, etc. 1854. p. 329, pl. X, fig. 1a—1m. 
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., Cirrhipedes operculés de l’Indian Museum de Calcutta. Memoirs of the Asiatic Society of Bengal. II, N° 1. 
p. I—10. 1907. 
2 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. Naturgesch. Jahrgang 1897. Bd. I. S. 227—28o. 
* 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 Jahrbiicher. XII. 1899. S. 441—447. 
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