450 On anew Cyprinoid Fish from Siam. 



LARVA GEA. 

 Family Appendiculariidse. 

 Appendiculart'a, BT^. {?) [Whitelegge]. Port Jackson. 



The above list comprises ISOspecies — a greater number than 

 that (about 176) known from the shores of North-western 

 Europe, a nearly corresponding area of coast in the Northern 

 hemisphere, and the one which, of all the world, has been most 

 exhaustively worked up. But even this large number of 

 species does not complete the Australian Tunicate fauna, as I 

 have seen from a preliminary examination of the large collec- 

 tions brought back from Australian seas by Professor A. C. 

 Haddon and by Dr. A. Willey that they each contain some 

 additional undescribed species. This great abundance of 

 species in these southern seas agrees with the view I expressed 

 in the * Challenger ' Report, that Ascidians " attain their 

 greatest numerical development in southern temperate regions," 

 and bears out especially the remark made long before by 

 Quoy and Gaimard : — " La Nouvelle-Hollande, dans sa partie 

 sud, et la Nouvelle-Zelande, sont les lieux de predilection 

 des Ascidies en general." 



I may add that the extra-tropical southern species do not 

 show any special relationship to the species of the northern 

 hemisphere. I do not think that the Tunicata can be said 

 to give any support to a " bipolar " hypothesis. 



LXIX. — Description of a new Genus of Cyprinoid Fishes 

 from Siam. By G. A. BoULENGEE, F.R.S. 



Catlocarpio. 



Allied to Catia, C. & V., with which this genus agrees in 

 the structure of the mouth, with large maxillary bone covering 

 the slender protractile prsemaxillary, the thin cephalic integu- 

 ment, the absence of barbels, the subinferior position of the 

 eyes, the very long and fine gill-rakers, the large scales, and 

 the short anal fin ; difiering in the short dorsal fin, with nine 

 branched rays, and the disposition of the (4) pharyngeal teeth 

 in a single series. 



