366 APPENDIX. 



The bivalves of this region were but few. In the South 

 Australian province species of Mactra, Psammuhia, Venus, 

 Tapes and Pec ten, all peculiar, were taken. This is the 

 region of the peculiar genus Myadora, of which five species 

 were dredged on sand in 6 fathoms at Port Jackson, 

 along with Myocliama anomioides, Trigonia margaritacea, 

 Lima hullata, and Cardium radiatum. In the North-east 

 Austrahan province we have species of Donar, Mactra and 

 Corhula, all apparently new, from the shallower localities ; 

 Corhida tunicata, Pectuncidus tenuicostaius, and another, 

 from 8 to 11 fathoms, off Cumberland Islands; species of 

 Area, Pectunculus, Avicula, Pecten, Venus, Circe, Cardium 

 Cardita, and Erycina, mostly new, from 15 to 17 fathoms 

 in a sandy and shelly bottom oif Cape Capricorn. 



Coralline Zone. Some dredgings in both North and 

 South-eastern provinces, in depths between twenty-seven 

 and forty-five fathoms, give a slight idea of the fauna of 

 this important region. In the South-eastern proAdnce we 

 find in forty and forty-five fathoms on a muddy bottom 

 in Bass's Strait, Titrritella sinuata, Trochus nebulosus, a 

 Pleurotoma, an Emarginula, a Dentalium, two species of 

 Cardita, a Cypricardia, a Venus, a Nucula, and Pectun- 

 culus holosericeus. In the North-eastern province we 

 find off" Cumberland Island in 27 fathoms, also on a 

 muddy bottom, species of Murex, Nassa, Turritella, 

 Ranella pusilla, a Fusus, Cancellaria antiquata, a Terehra, 

 two Dentalia, a Natica, a Terehellum, a Scalaria, a Car- 

 dium, a Venus, a Nucula, a Pecten, and a Spondylus. 



It is evident from the comparative paucity of unde scribed 

 species procured in the Littoral zone and the large pro- 

 portion of new or doubtful forms among those taken by 

 the dredge, that a rich harvest has yet to be reaped in the 

 deeper regions of the southern seas. In the lower zones, 

 however, just as much as in the upper, the distinctions of 

 province are maintained. The exj)lanation of this com- 



