128 



The rocks uncovered at low tides are inhabited in the upper 

 region by Litlorina caerulescens, Siphonaria Diemenensis, 

 Acmcea alticostata, Patella tramoserica, P. Gealei, *Trochocochlea 

 chloropoda (Tate), T. constricta, T. striolata, Chiton petholatus, 

 Mytilus Menheanus, and 31. hirsutus, amongst which nestles 

 * La sea rubra (Mont.) In the lower region live N'erita atrata, 

 Turbo undulatus, Diloma odontis, Acmaia septiformis, Purpura 

 textiliosa, Cominella alveolata. The sandy shore is the habitat 

 of Natica Baconi, *Donax (cf.) epidermia (small, with denticu- 

 lated margins) , Donacilla prcecisa, D. elongata. 



The commoner and the conspicuously-large shells which are 

 cast up on the sandy beaches at the Head o£ the Bight, near 

 "Wilson's Bluff, and at Eucla are : — Triton Waterhousei, *Melo 

 Miltonis (Gray), Cassis Jimbriatus, Conus Anemone, Turritella 

 clathrata, Amalthea conica, Phasianella bulimoides, P. ventricosa, 

 Clanculus gibbosus, Thalotia picta, Gibbula Preissiana, Turbo 

 lamellosus, Haliotis glabra, Bulla oblonga, JSIactra rufescens, M. 

 pura, Arcopagia decussata, Chione strigosa, *C. Yictoricc (T. 

 Woods), Marcia faba , Soletellina epidermia, Cardium cygnorum, 

 Modiola australis, Area lima, *A. trapezia (Lamk.), Pecten 

 asperrimus, Spondglus tenellus, and Cuneus galactites. Petepora 

 phcenica. 



Those marked with an asterisk in the above lists have not 

 previously been recorded for South Australia, though known 

 to me as occurring elsewhere in our waters. One species only 

 I consider to be new to science, I have named it Trochococlilea 

 chloropoda . 



Beyond the limits of the coast-line of Bunda Cliffs, 

 especially in the sheltered bays to the east, the molluscan life 

 is very rich, and the collections obtained at Fowler's and 

 Streaky Bays contain several novelties and many forms hitherto 

 thought to be confined to the eastern shores of the continent. 

 The consideration of these will be reserved for a separate 

 paper. 



Explanation of Plate IY. 

 Eig. 1. Section from the Pidinga rock basin, bearing S."W. r 



distance seven miles. Vertical scale one-fourth 



inch to 100 feet. Strike of metamorphic rocks 



N.N.E. 

 Pig. 2. Diagramatic section near the Head of the Bight, view 



facing S.W. Vertical scale, 80 feet to one inch 



(see page 114). 

 Pig. 3. Profile of Wilson's Bluff, Bunda Cliffs (see page 105). 



Vertical scale, 100 feet to one inch. 



