273 



of Ischnochiton auratus, Ashby, and another new species with 

 erect scales under the name of Ischnochiton projjerensis, Ashby. 

 A special paragraph is devoted to the juvenile forms of several 

 species, as these differ so widely from the adults that they have 

 continually been confused. 



Ischnochiton lineolatus, Blainville (Chiton lineolatus, 

 Blain., Diet. Sci. Nat., p. 541), non. 7. lineolatus, Blain., 

 of Ire. and May = C longicymha, Blain., of Quoy and Gaimard 

 = 7. haddoni, of Pilsbry = 7. crispuSj Reeve, of Bednall = 7. 

 crispus, Reeve, of Torr. 



Pilsbry (in Man. Con., vol. xv., p. 105) publishes a 

 translation, and Ire. and May (Proc. Mai. Soc, vol. xii., pts. 

 ii. and iii., p. 107) publish Blainville's original description. 

 Ire. and May recognized Ischnochiton contractus, Reeve, of 

 Pilsbry, as conspecific with Blainville's Chiton lineolatus; but 

 Dupuis (Ex. Bull. Mus. Hist. Nat., 1918, No. 7) says, "Mr. 

 Tom Iredale puts forward some ingenious hypotheses with 

 regard to the synonymous rectification to be applied to several 

 species, for exmple the Chiton longicymha, Blainville (I agree 

 with him on this point), and the Chiton lineolatus, Blainville. 

 Here the facts contradict his presumption. According to him 

 the C. lineolatus, Blainville, must be the Ischnochiton con- 

 tractus of Pilsbry, 1895, et auct. (non Reeve, 1847). Now 

 the specimen of de Blainville, brought from King Island by 

 Peron and Lesueur, is certainly not this species, but rather 

 the Chiton crispus. Reeve, a species to which the description 

 of de Blainville may otherwise be well applied. According to 

 Iredale the typical Chiton crispus must be from New South 

 Wales. It is certain that the Ischnochiton contractus, auct., 

 is not the contractus, Reeve, any more than it is the lineo- 

 latus, Blainville; the latter is the Ischnochiton of South Aus- 

 tralia and Tasmania which has been regarded as 7. crispus^ 

 Reeve, and which Iredale proposes as a distinct species under 

 the name of 7. decoratus, Sykes." M. Dupuis then names 

 7. lineolatus, of Ire. and May, Ischnochiton iredalei, Dupuis, 

 under which name it will now be known. 



I am satisfied that the views expressed by M. Dupuis are 

 sound. I therefore propose to recognize Blainville's lineolatus 

 in the form common to Tasmania, Victoria, and South Aus- 

 tralia, bearing large girdle scales, coarsely fluted (auct. 

 crispus, Reeve). 



The only alternative, as far as I can see, would be to 

 recognize Ire. and May's 7. atkinsoni as Blainville's species, 

 but it is quit-e clear that his description could not apply to 

 the Tasmanian form of that shell, and, further, the large-scaled 

 form was very common at Penguin, in north-western Tasmania, 



