42 AMPHINEURA. [Polyplacophora. 



not beaked, but with a low posterior keel on the jugum ; central and 

 lateral areas smooth, the latter a little raised, both with fine growth- 

 lines. Posterior valve depressed, the mucro plane, central, posterior 

 margin not emarginate. Girdle leathery, bearing numerous short, 

 rigid, dark-brown spinelets. Colour dark brown ; sometimes the 

 dorsal area is light greenish, with irregular transverse bands of brown 

 spots, the posterior part of each valve broadly and vividly pink- 

 coloured ; the girdle is in fresh specimens greyish-white with minute 

 close brown dots, greenish-brown when dry. Interior white, smooth ; 

 anterior valve having 17, central 3, posterior 19 short slits ; the in- 

 sertion plates blunt, deeply pectinated ; sutural plates continuous 

 across the sinus, which is indicated by a shallow wave or bay. 



Length, 50 mm. ; breadth, 34 mm. : a spirit specimen in my 

 collection has a length of 55 mm. ; breadth, 44 mm. Divergence, 

 135-140. 



Type. Mus. Acad. Nat. Sci., Philadelphia. 



Hob. North and South Islands ; Little Barrier Island ; Te One- 

 poto, near Lyttelton (H. S.) ; Stewart Island (Otago Museum). A 

 very rare species. 



Remarks. It is closely allied to E. nobilis, from which it differs in 

 the proportions of the valves, depressed form, fewer slits, &c. 



Subfam. 2. TONICIIN.E. 



Eyes developed on end valves and lateral areas ; posterior valve 

 not deeply sinused behind, its insertion plate developed. Girdle 

 leathery, nude or nearly so. 



Genus 3. TONICIA, Gray, 1847. 



Tonicia, Gray, P.Z.S.. 1847, 65, 67. Type : Chiton elegans, Frembly. Tonicia, 

 Gray, Guide Syst. Dist. Moll. B.M., 1857. 185. Lucia. Gould (pre- 

 occupied). Lucilina, Dall, 1881. Toniciopsis (in part), Thiele, " Das 

 Gebiss der Schneeken," ii, 371. Tonicia. Gray, Man. Conch. (1). xiv, 

 Hit, 194 ; xv, 89. 



Valves external, all having pectinated insertion teeth ; sutural 

 plates separated by a squared denticulate sinus ; lateral areas and 

 end valves bearing radiating rows or bands of eye-dots. Girdle 

 leathery, naked or sparsely hairy. Gills extending the whole length 

 of the foot. 



The species of Tonicia inhabit mainly the shores of the southern 

 and tropical Pacific, being found from middle America to Cape Horn, 

 and from the Philippines to Australasia, 



1. Tonicia cuneata, Suter, 1908. Plate 5, fig. 1. 



Tonicia cimeata, Suter, T.N.Z.I., xl, 1907 (1908), 360, pi. 28, f. 1, 2. 



Shell oblong-ovate, rather small, valves much raised, the inter- 

 mediate valves beaked, angled above, with cuneiform sculpture. 



