[PHOBB] i.\ PLAXIPH4 ! 1 



r. S. Ui i \ i . G uah. [oon., t, I, i'. i 

 i/ GRAY, r. /.. UJfopafta ! 



J/\ MII.I in I) M.I,, Proa l'. 8, Nat. MUH. 1878, p. 303. / 



hUnmllii DAM,, /. c. 1886, p. 210, 21 1. 



This lurm' sp.vir- i- nearly allied (.. /'. ,-. f<tta of ( 'alifornia, hut it 

 diti'rrs in having the lateral areas simply x.nit-u hat swollen, and Dot 

 excavated in tin- middle. Tin- sinus between the sutural plates is a 

 shallow wave, lmt it deepens mi the two or three backward valves, 

 as in the Californian species. The description iriven above is com- 

 piled from Carpenter's notes on the type specimens. 



P. I-I-:TASUS Reeve. PL 66, fig. 25 (enlarged.) 



Shell small, somewhat abbreviately ovate. Valves with a polished, 

 slightly beaked triangular area in the center, roughly granulated on 

 each side. Bright scarlet. Ligament very broad, especially in front, 

 also bright scarlet, beset here and there with short hairs and bristles. 



Length 1, breadth 1 inch, (five.) 



Cape Eivers, Celebes (Belcher.) 



Chiton petu8 REEVE, P. Z. S. 1847, p. 25 ; Conch. Icon., t. ?6, 

 no. 114, fig. 112, (not 112 on plate of details, nor 114) ; July, 1847. 

 ADAMS & REEVE, Zool. of the Voy. H. M. S. 'Samarang/ Moll., 

 t. 15, f. 11. 



Referred to this genus on account of the peculiar girdle. A single 

 specimen was collected. The characters of the interior have riot 

 been made known. 



Genus XXXI. PLAXIPHORA Gray, 1847. 



Plaxiphora GRAY, P. Z. S. 1847, pp. 65, 68, 169. SHUTTLES ., 

 Bern. Mittheil. 1853, p. 69. H. & A. ADAMS, Gen. Rec. Moll, i, 

 p. 481. Placiphora CPR., MS. and in DALL, Proc. U. S. Nat. Mus. 

 1881, p. 284. Placophora DALL, Cat. Mar. Moll. S.-E. U. S., p. 1 74 ; 

 not Placophorm Mulsant, 1873 (Trochilidce'). Eupfaxiphora SHUT- 

 TLEW., 1. c., (proposed for biramosus and petholatus). Eiiplndphora 

 CPR., /. c., (type P. petholatd). Ch'jdopleura (part) ROCHEBRUNE, 

 Miss. Sci. du Cap Horn, 1882-1883, vi, Zool., Polyplacophores, p. 

 135 (1889), not Chcetopleura Shuttlew. ! 



Valves mostly exposed, all having insertion-plates developed, that 

 of the anterior valve normally with 8 (sometimes 7-9) slits (except 

 in the subgeuus Placophoropsis which has many slits). Median 

 valves 1 slit. Posterior valve having the insertion-plate smooth, 



