170 



Median Valve. — Dorsal area, triangular, smooth, spotted. 

 Lateral areas distinctly raised with four or five irregular pus- 

 tules. Median valves covered with microscopic granules. 



Posterior Valve is missing. 



Girdle. — Covered with imbricating striated scales. The 

 outer edge of the girdle is fringed with delicate specules. 



Measurement. — 4x3 mm. 



Ha b. — Henley Beach (Mr. Baker). 



Remarks. — Strongly resembles a juvenile Loricella 

 angasi, but its striated girdle-scales distinguish it. I have 

 much pleasure in naming it after its discoverer. 



EXPLANATION OF PLATES. 



a — Dorsal view of entire shell. 



b— Anterior valve. 



c — Median valve. 



d — Posterior valve. 



e — Lateral view of posterior valve. 



/ — Portion or girdle magnified. 



The sizes of type specimens are marked in each case. 



Plate V. 



la,b,c,d,e,f — Callochiton, mayi, Torr. 

 2a,b,c,d,e,f — Lepidopleurus pelagicus, sp. nov. 

 3a,b,c,d,e,f — Ischnochiton bednalli, sp. nov. 



Plate VI. 

 4a,b,c,d,e,f — Acanthochiton rufus, sp, nov. 

 5a,b,c,d,e,f — Acanthochiton kimberi, sp. nov. 

 6a,b,c,d,e,f — Ischnochiton levis, sp. nov. 



Plate VII. 

 7a,b,c,d,eJ — Acanthocltites rubro stratus, sp. nov. 

 &a,b,c,d,e,f — Acanthochites bakeri. sp. nov. 



