Ischnochiton.] AMPHINEURA 



2. Ischnochiton fulvus, Suter, 1905. Plate 3, fig. 2, a-d. 



Ischnochiton fulvus, Suter, J. Mai., xii, 66, pi. 9, f. 5-10 ; Iredale, T.N.Z.I., 

 xl, 373. 



Shell small, elongated oval, with the sides subparallel, obtusely 

 angled, fulvous. In size, outline, and colour very much like Lepido- 

 pleurus inquinatus. Anterior valve with a few concentric ridges, 

 minutely quincuncially punctate ; the anterior margin white, the 

 remainder uniformly fulvous ; there is a slight posterior median 

 notch. Intermediate valves with the whole surface minutely punctate 

 like the anterior valve, with a few concentric ridges on the central 

 areas, extending over the slightly raised lateral areas, where they are 

 considerably stouter ; no indication of radiate sculpture. Posterior 

 valve punctate like the others, concentrically ridged, mucro subcentral, 

 posterior slope slightly concave. Girdle covered with very small 

 imbricating scales of somewhat unequal size ; they are flatly convex 

 and deeply grooved, usually 4 grooves on a scale. Colour varies from 

 light to dark fulvous, the dorsal and anterior parts being always lighter- 

 coloured ; the anterior margin of the head valve, the anterior and 

 lateral margins of the central valves, and the posterior margin of the 

 tail valve have a narrow white border. Interior dirty-white ; anterior 

 valve with 12 slits at unequal distances ; intermediate valves with 

 1 slit on each side, the posterior tooth small ; posterior valve with 

 12 slits, the teeth unequal in size ; sinus broad, deep, and smooth ; 

 sutural laminae with the inner sides concave. 



Length, 12 mm. ; breadth, 7 mm. Divergence, 100. 



Type, from Te Oneroa, in my collection. 



Hob. Te Oneroa, Preservation Inlet ; Brighton, Otago ; Banks 

 Peninsula (Iredale). 



Remarks. The very similar L. inquinatus has the intermediate 

 valves longitudinally striated. According to Dr. Torr, this species 

 is also found on the coast of South Australia. 



3. Ischnochiton longicymba, Qtioy and Gaimard, 1835. Plate 2, 



fig. 2 ; Plate 3, fig. 3, a, b. 



Chiton longicymba, Q. & G., Voy. Astrol., iii, 1835, 390. pi. 75, f. 1-18 : 

 Conch. Icon., Chiton, pi. 19. f. 125; pi. 24, f. 163d. Ischnochiton 

 longicymba, Q. & G., Man. Conch. (1), xiv, 87, pi. 22, f. 58-66 ; P. Mai. 

 8., ii, 186. /. fruticosus, Gould. : Wissel, Zool. Jahrb., Syst., xx, p. 594, 

 pi. 21, f. 5, 6 ; pi. 22, f. 7-10 (anatomy) ; not of Gould. 



Shell oblong, broadly arched, appearing smooth to the naked eye, 

 colour very variable. Anterior valve with flat and numerous radiate 

 ribleti?, cut up into granules by concentric furrows, which are strongly 

 impressed near the margin. Intermediate valves with the central 

 areas very closely and finely wrinkled in quincuncial pattern, extending 

 over the jugum. Lateral areas slightly raised, with 4-12 radiating 

 riblets, very often bifurcating, cut into nodules by growth-lines ; 



