28 AMPHINEURA. [Polyplacophora. 



bristles, situated near the sutures upon the sides of the valves, and 

 4 around the anterior valve. Colour of the exposed portions of valves 

 yellowish-white ; girdle olive, often beautifully variegated with orange 

 and light brown ; blackish-brown in dried condition. Interior bluish- 

 white ; anterior valve with 5 slits, all except the median slit in- 

 conspicuous, the upper surface radiately strongly striated ; inter- 

 mediate valves with 1 minute slit on each side, posterior margin 

 produced backward into 2 rounded lobes ; posterior valve with 2 

 well-marked side slits, between them 2-5 minor ones, the upper 

 surface radiately rugosely striate ; sinus narrow, sharp, and smooth ; 

 the sutural laminase high, triangularly rounded ; valve-callus broad, 

 strong. 



Length, 38 mm. ; breadth, 20 mm. (Q. & G.) 



Dentition. Mutton, T.N.Z.I., xv, 129, pi. 16, f. H. 



Type in the British Museum. 



Hob. Coasts of the North and South Islands ; in 15 fathoms near 

 Stewart Island ; on rocks and under stones near low-water mark 

 in sheltered situations. 



Remarks. This species grows to a larger size than the measure- 

 ment given by Q. & G. ; the specimens from deeper water are small. 

 I have not seen any specimens from the west coasts. It is by no 

 means common. 



Maori. Karimoan (fide Quoy and Gaimard). 



Sect. 3. LOBOPLAX, Pilsbry, 1893. 



Loboplax, Pilsbry, Man. ('touch. (1), xv, 8, 38. Type: Acanthochites vio- 

 laceus, Q. & G. Phacellopleura, Opr. MS. ; not Phakellopleura. Guilding. 



Valves partly covered, the anterior valve having 5 radiating ribs 

 and the same number of lobes along the margin ; the posterior valve 

 having the insertion plate grooved outside, notched and slit along 

 the edge, between the usual postero-lateral slits. Girdle leathery, 

 having minute sutural tufts. Gills (of violaceus) extending along the 

 posterior two-thirds of the foot. (Pilsbry.) 



The number of species belonging to this section is small ; three 

 species belong to New Zealand, four to Australia, and one to New 

 Caledonia. 



3. Acanthochites Marije, Webster, 1908. Plate 4, fig. 3. 



Acanthochites JIarice, Webster, T.N.Z.I.. xl. 1907 (1908). 254. pi. 20, f. 1-11. 



Shell elongated, elevated, dorsal angle about 110. Colour greenish- 

 grey, minutely freckled with dark. Latero-pleural areas crowded with 

 flattened granules, strap-shaped or oval, as in A. zelandicus, all the 

 valves being bordered with irregular, raised, white, pebble-like granules 

 of the same type as those in A. violaceus, with which this species also 



