HULL. 85 



Dimensions, 35 x 12 mm.; height 8 mm. The girdle of the type is very 

 much contracted, and perhaps the width of a well-preserved specimen would be 

 relatively greater. 



Station; probably in deep water. 



Type in the Adelaide Museum. 



Mr. Edwin Ashby informs me that the history of this shell is that it was 

 discovered by Mr. W. J. Kiniber, of Adelaide, who was collecting many years 

 ago at the end of a reef at Port Willunga at lowest tide. He noticed a Chiton 

 iloating foot upwards on the water, and upon securing the specimen he identified 

 it as R. bednalU Pilsbry. The animal was in the shell, and was removed by Mr. 

 Kimber. In colour this shell closely resembles Pilsbry 's species, but it may be 

 described as generally bolder, heavier and coarser in sculpture than R. bednalli, 

 the figures in which the two shells are shown in detail expressing the differences 

 more clearly than it is possible to convey in a verbal description. 



Explanation of Plate XXIVB., Figs. 1-8. 



1. Rhyssoplax surrecta, anterior valve. 



2. „ „ one-half of a median valve. 



3. „ „ posterior valve. 



4. „ „ girdle scabs. 



5. Rhyssoplax bednalli, anterior valve. 



(i. .. „ one-half of a median valve. 



7. „ „ posterior valve. 



8. „ „ girdle scales. 



