215 



Definitions of Seven New Species of 

 South Australian Polyplagophor.^. 



By W. G. ToRR, LL.D., and Edwin Ashby. 

 [Read October 4, 1898.] 

 Plates VI. and VII. 



In the Proceedings of the Malacological Society of London^ 

 vol. II., part 4, April, 1897, appeared a very excellent paper by 

 Mr. W. T. Bednall on the Polyplacophora of South Australia. 



This painstaking article has paved the way for all future 

 workers in this field, and the South Australian rocks are furnishing 

 excellent opportunities for original research. 



New species are constantly being discovered. Unfortunately^ 

 in several instances only one specimen of a species has been 

 found. 



The deep dredging operations of Dr. J. C. Verco has helped 

 us very considerably, and has introduced several species not 

 found near the coast. 



To Mr. E. H. Matthews, of Yorke's Peninsula, we are deeply 

 indebted for helping us to classify our specimens. 



To Mr. M. M. Maughan and L)r. J. C. Verco our thanks are 

 due for specimens supplied, and to Professor Ralph Tate for his 

 kind advice and encouragement in preparing our work for the 

 printer and engraver. 



1. Chiton Vereonis, n. sp. Pi. 6, fig. l. 



General Aj^pearance. — Shell oblong, much elevated, carinated,. 

 side slopes slightly curved and steep. Colour. — Flesh-coloured, 

 variegated with creamy-white flecks. Third valve with more 

 white than others : a broad blackish band running all medial 

 areas. 



Anterior Valve. — Ten riblets ornamented with strong elongated 

 longitudinal tubercles. Teeth, eight slits. 



Fosterior Valve. — Mucro median, prominent. Ornamented 

 with nine or ten riblets, composed of tubercles similar to anterior 

 valve. Sinus moderately broad. 



Median Valve. — Lateral areas ornamented with 12 to 14 pairs 

 of strong elongated longitudinal tubercles, divided into two rows 

 by a de^p sulcus. The tubercles vary from opposite to alternate, 

 the anterior being shorter than the posterior. Pleural areas 

 covered with 14 to 16 longitudinal riblets, sometimes continued 



