10 AMPHINEURA. [Polyplacophora. 



interspaces densely granulated. Posterior valve has on the central 

 area the same sculpture as the intermediate valves on the same area, 

 and the posterior area the same as the anterior valve ; inucro sub- 

 central, posterior slope slightly concave. Girdle covered with imbri- 

 cating, flatly convex, and feebly striated scales, amongst which smooth 

 scales occur. Colour extremely variable, mostly light green mottled 

 with dark green, brown, yellowish-white, &c. ; sometimes black with 

 a broad light band along the back, or grey with a dark-green median 

 band. Interior coloured in accordance with the ground-colour of the 

 outer side ; anterior valve with 9-12 slits, intermediate valves with 

 1 slit on each side, posterior valve with 1 1 slits ; the teeth thin, sharp, 

 and smooth ; posterior tooth of the side insertion plates short, and 

 terminating abruptly before attaining the posterior margin of the 

 valve ; sinus very broad ; sutural lamina? narrow and rather high. 



Length, 40 mm. ; breadth, 18 mm. : mostly smaller. Divergence, 

 about 95. 



Type in Mus. Hist. Nat., Paris. 



Hob. Throughout New Zealand and at the Chatham Islands ; 

 under stones between tide-marks ; more common in the north. 



Remark. Nearly allied to /. crispus, Reeve, of Tasmania and 

 Australia. 



Maori. Cara (fide Quoy and Gaimard). 



4. Ischnochiton luteoroseus, Suter, 1907. Plate 3, fig. 4. 

 Ischnochilon luteoroseus, Sutev, P. Mai. S., vii, 293, f. 1 in text. 



Shell small, elongately oval, minutely granulate, uniformly pink 

 or yellowish with longitudinal pink bands. Anterior valve with a 

 posterior rounded sinus, finely granulated in quincuncial pattern, 

 as is also the tegmentum of all other valves. Intermediate valves with 

 the lateral areas hardly raised and not well defined, valves lightly 

 beaked and sharply rounded. Posterior valve with a central mucro, 

 a slight transverse impression below it, the posterior slope straight. 

 Girdle with small, imbricating, roundish, flatly convex, and smooth 

 scales of equal size. Colour pink, but mostly yellowish with concentric- 

 pink bands on the head valve, longitudinal, usually 3 on each side, 

 on the central valves, and mostly absent on the tail valve ; these 

 bands are slightly undulating or zigzagging. Interior bright pink ; 

 anterior valve with 11 slits at irregular distances, intermediate valves 

 with 1 slit on each side, posterior valve with 8 slits : corresponding 

 with the slits there are radiate fine white lines in all valves ; sinus 

 broad and smooth ; sutural laminae broadly rounded. 



Length, 5 mm. ; breadth, 3 mm. Divergence, 80. 



Type in my collection. 



Hob. A few specimens and a number of valves in sand dredged 

 in 50 fathoms, near the Bounty Islands, by Captain Bollons ; Dusky 

 Sound, in 30 fathoms (R. Henry) ; Stewart Island. 



