iredale: thr chitons of thk kkrmadec islands. 29 



Remarks. — This little species recalls Lorica in miniature, and cannot 

 well be confused with any other Australasian Chiton. Its nearest 

 relations are Lepidopleurusnorfolcensis, Hedley & Hull, from Norfolk 

 Island, and Z. catoiatus, Hedley & Hull, from Lord Howe Island. 

 The authors note the relationship of the latter, but do not compare 

 the former, which they contrast with the New South Wales X. badius, 

 Hedley & Hull. With the type of Zepidopleuriis these small 

 species have nothing in common save the absence of insertion-plates. 

 I am therefore introducing tlie new sub-generic name Terenochiton, 

 with L. subtropicalis, Iredale, as type, and would for the present 

 include all the small Australasian ' Lepidopleurtis' under this 

 heading, though I can see little direct affinity between the present 

 species and the Neozelanic Z. inquinatus (Reeve). 



Sub-order CHITONINA. 



Family CALLOCHITONID^. 



Genus EuDoxocHiTON. 



UudoxocJiiton, Shuttleworth, Mittheil. naturf. Gesell. Berne, p. 191, 

 1853. 



Type (by monotypy), Acanthopleura itobilis, Gray. 



The genus Eudoxochiton , placed by Pilsbry in the family Chitonidse, 

 has been transferred by Thiele to his family Callochitonidae, and in 

 this latter disposition I have already expressed (Proc. Malac. Soc, 

 vol. ix, p. 153, 1910) my concurrence. 



Eudoxochiton perplexus, n.sp. PI. I, Figs. 4, 6, 8. 



Shell large, oval, elevated ; valves arched, side slopes almost 

 straight ; girdle leathery, with short spinelets. Colour uniform 

 reddish-brown, girdle greenish-brown. The only sculpture is minute 

 punctulation, though indistiTict radiation may sometimes be observed 

 on the anterior valve, whilst growtli-liues are commonly seen on the 

 central areas. Anterior valve comparatively small. Median valves 

 narrow, lateral areas well raised. Posterior valve with the mucro 

 elevated at about the anterior third, the posterior slope slightly 

 concave. Inside coloration pure white. Anterior valve has the 

 insertion-plate very short, and cut into about twenty-three teeth, 

 which are irregularly deeply pectinated. Median valves with sutural 

 plates continuous, the sinus only indicated by a shallow depression. 

 Insertion-plates short, with three or four teeth as in anterior valve. 

 Posterior valve faintly emarginate on the posterior border, the 

 insertion-plate veiy short and not projecting beyond the tegmentum. 

 About twenty-three slits can be counted, the teeth as in anterior 

 valve. Girdle leathery, covered with short brown spinelets. Length 

 of type 59, breadth 40 mm. 



Sab. — Sunday Island, Kermadec Group. 



Station. — On I'ocks about low tide. 



