[( I \. 



sharp. i , v -ry deeply pectinated. I ... tdl -inns 



minutely denticulated. This species :nnl the following, with 

 trniH'iitn. are intermediate between Tnnirin and .\r,it,ffi/>/>'ii,-'i ; hut 

 they a-Tee with this ireiius in the porcellanoiis texture, deep slits, 

 angular denticulated -inus and pect inated teeth. Tin- .-li-ht la: 

 lion of the girdle appears to l>e a secondary character. 



T. NIGBOFUN4 r\i \ ( 'arpenter. Unfigured. 



sholl small, rather elongated, elegantly clouded olivaceous and 

 l>ro\vn ; moderate] v arched, the dorsal ridge obtuse. Lateral areas 

 moderately defined, ornamented with radiating and longitudinal 

 wrinkles irregularly decussating, with black dots scattered between 

 them. Central areas having subparallel, subdecussating, scarcely 

 regular ribs, obsolete at the jugum. Mucro posterior, elevated. 



Interior having 8-10 slits in the anterior, 1 in the central, 12-14 

 in the posterior valve ; teeth in the posterior valve solid, sloping, 

 short ; sinus broad, denticulate. Girdle copiously clothed with hair- 

 like scales. Length 12, breadth 6'2, alt. 1-7 mill. (Qpr.) 



Tahiti. (Pease.) 



Acanthopleura nigropunctata CPU., P. Z. S. 1865, p. 511. PEASE, 

 Amer. Journ. Conch, vii, p. 194. Tonicia nigropunctata CPR., J/\ 



This species is most closely allied to T. suezensis, but the latter 

 has the valves more beaked and curved, and the central rugae per- 

 pendicular to the diagonal lines, while in this they are nearly 

 parallel to the dorsal ridge. 



T. FORTILIRATA Reeve. PI. 40, figs. 3, 4 (enlarged.) 



Shell ovate ; valves somewhat beaked in the middle ; posterior 

 valve umbonated, blunt ; lateral areas rather concave, granulated 

 anteriorly ; central areas strongly arcuately ridged. Yellowish 

 variegated with green, stained with red in the middle. Ligament 

 horny. (Reeve.) 



Rait if* f-^'ind, Torres Sts. (Ince) ; Port Darwin, 8-10 fms. sand 

 and mud ( '( !oppioger.) 



Chiton fortilinihi* KVK., Conch. Icon., t. 18, f. 112. C. (ZWcm) 

 fortiliratus SMITH, Zool, ' Alert ' p. 84. 



( 'arpenter writes of the type: Anterior valve having >, central 

 valves 1, posterior valve 13 slits; teeth short, numerous, very sharply 

 pectinate: short at the hinder end but gradually becoming a little 

 longer. Kaves short, slightly rugose, not spongy ; sinus with about 

 20 teeth, rather broad, flat. Interior whitish. Outside ashy 



