iW?y Species of GJdton. 2'.) 



scales, is uniuistakablv well secured to the very numerous and 

 deei)ly-cleft teeth in the insertion plartes. 



Dimensions. Len<rth, 13.20 mm. ; breadth, 10.15 mm. 



Locality. — (.Queensland (Dr. Ton*). 



Observations. — The genus Enoplochiton, probably the highest 

 form of Chiton life (excepting perhaps Tonicia and Acantho- 

 pleura) is new to Australia, and it is one of the most interesting 

 objects in MoUuscan development. 



The new species is not a typical form, and we have placed it 

 in this genus provisionally, as it has the characteristics of 

 numerous oval eyes and a scaled girdle, but these girdle scales 

 in the Australian species are smaller, much more numerous 

 and closely compacted ; and the whole of the dorsal sculpture 

 is gra/nulate ; whereas in E. niger the sculpture is incised. 

 The eyes in our species are very much larger. 



EXPLANATION OF PLATES III AND IV. 



The following figures of details are from another specimen 

 slightly varying in colouration : — - 



Fig. 1. — Enoplochiton torri, Bastow and Gatliff. 



Fig. 2. — Girdle, dorsal aspect. 



Fig. 3. — An enlarged view of one of the eye orbits shown in 

 Fig. 2, also very fine granulation which extends 

 over the whole of the pustules on the valves. 



Fig. 4. — Dorsal aspect of portion of anterior valve, tilted up so 

 as to show the teeth. The eyes are .075 x .050 

 mm. 



Fig. 5. — Partially decalcified anterior valve, dorsal aspect, show- 

 ing eye orbits and optic nerves, also partly 

 eroded teeth. 



Fig. 6. — Anterior valve, dorsal aspect, in natural state, show- 

 ing arrangements of pustules. 



Fig, 7. — Anterior valve ventral aspect, showing teeth punctures, 

 slits ; part of the teeth are broken away to show 

 the ends of nerve channels, where they connect 

 with the nerve system of mamtle. 



