264 



chiton, very flat, witli widely expanded girdle which puckers 

 in drying. At present it is only recorded from Tasmania, 

 and originally described from the northern side of the island ; 

 the locality under review extends its range almost to the. 

 extreme south. 



Ischnochiton atkinsoni, Ire. and May, was fairly common,. 

 and varied from the typical reddish-brown form to a creamy- 

 white one. As compared with /. crispus, Reeve, they are 

 always a small chiton, and their station is in decidedly deep 

 water in Tasmania. 



Ischnochiton proteus milligani, Ire. and May. Only one^ 

 somewhat worn specimen of this shell was taken. While it 

 is fairly common at Port Arthur, it looks as if Lunawanna 

 is the extreme limit of its habitat westward and southward. 



Ischnochiton iredalei, Dupuis, non lineolatus, Blainville. 

 A series of this form was collected, mostly rather old and worn. 



Ischnochiton (Haploplax) mayi, Pilsbry. Quite a com-^ 

 mon species, seldom' met with below half tide; its almost 

 circular shape and deep-black colour easily separates it from 

 any other known species. 



Ischnochiton (Haploplax) mayi, var. viridis, n. var. A 

 very striking variant from the foregoing black form is met 

 with at Lunawanna, and seems peculiar to the southern end 

 of D'Entrecasteaux Channel. The shell is pale green and 

 the girdle jet black. While it is so distinct in outward 

 appearance from the typical shell a careful examination of 

 the sculpture and girdle scales reveals no radical differences 

 from the usual black form. It is interesting that a form 

 that everywhere else seems so constant in both colour and 

 sculpture should in this locality have such a distinct local race. 



Ischnoradsia australis evanida, Sow. This chiton, with 

 the exception of Sypharochiton pellisserpentis, Q. and G., 

 which, in respect to numbers, runs it very close, was by far 

 the most common species in the locality and there attains 

 a very large size; specimens were taken up to 90 mm. in 

 length, but these large ones were always more or less eroded. 

 They vary from the almost smooth form, common in North- 

 western Tasmania and South Australia, to those in which almost 

 the whole of ,the pleural area is covered with longitudinal 

 ribbing, and some, in which the ribbing is carried across the 

 dorsal area. In none of them was this sculpture quite as 

 coarse as is the case with the Port Jackson specimens, that 

 being the type locality for the dominant form 7. australis. 



Ischnochiton'(Heterozona)suh-viridis, Ire. and May. Thi& 

 species was very numerous in this locality; it appears to 

 replace 7. crispus, Reeve, which is the common species in the 

 northern and eastern coasts of Tasmania, and from which this 



