268 



Lepidopleurus, sp. indet. ; and Acanthochifon speciosus, H. 

 Adams; all dredged in 9 fathoms off Pilot Station, and also 

 at tlie same depth between Alonnah and Gordon in mid 

 channel." • 



''Although it seems unlikely that the chiton fauna will 

 be greatly increased, yet it is probable there are some species 

 still to be found, when we consider the great extent of the 

 coastline and that there are several absolutely land-locked 

 bays, the sort of localities loved by Acanthochitons. It seems 

 reasonable to expect a few of these. Possibly others may 

 occur, such, for instance, as Loricella, which is found at Port 

 Arthur, and Bhyssoplax diaphora, Ire. and May, which has 

 been taken in the vicinity of Brown River." 



In conclusion. — The absence of Ischnochiton crispus, 

 Heeve, from the Channel is remarkable', and suggestive that 

 its range westward ends with the mouth of the Derwent. At 

 Prederick Henry Bay and Port Arthur it is very numerous 

 and of exceptional size, and on the northern coast of Tasmania, 

 in Victoria, and eastern South Australia, it is the common 

 chiton, I wish to acknowledge the able help of my colleague, 

 Mr. W. L. May, the well-known conch ologist, for the results of 

 the collecting trip would have been far inferior but for his 

 co-operation. The types of Kopionella tasmanica and Haplo- 

 plax mayi, var. viridis, I am presenting to the South 

 Australian Museum. 



MoPALiiDAE, Pilsbry. ' 



Kopionella tasmanica, n. sp. 



In my description of the genus Kopionella (Trans. Roy. 

 Soc. S. Austr., vol. xliii., 1919, p. 70) I foreshadowed the 

 probability of the Tasmanian form being ultimately found to 

 be specifically distinct from K. matthewsi, Iredale. Now that 

 Mr. W. L. May and I have collected a complete series of 

 fresh, undamaged specimens, I am able to demonstrate the 

 correctness of this surmise. I would take this opportunity 

 to correct the closing paragraph in the same paper which 

 compares the genus Loricella with the Mopaliidae, it should 

 have been between the former and Plaxiphora. 



General Appearance. — Shell broad, rather flat, sides 

 slightly rounded, dorsal area raised and beaked, lateral area 

 clearly defined by two raised ribs, girdle beset with spicules, 

 the whole shell usualy covered with a dense growth of algae. 



Colour. — When wet a bay-brown (Ridgway's Colour 

 Standards, pi. ii.m.), in others claret-brown, ornamented with 

 two broad, longitudinal, white dashes or stripes across the 

 pleural area; in some valves two additional incipient stripes 

 are discernable. In some specimens these stripes are green or 

 greenish-white. In specimens from Little Norfolk Bay the 



