N ri \< "i-iiMiu. 



Cm i"N ' \~i \NM - < 'outhouy . (ild. |M. 14, fig. 5. 



Animal with the under >ide of tin- mar/in j,ah- Li 

 narrow oval, dull olive color : head small, and laterally comprewed ; 

 branch!:*' pale oehreoiis-ivd, i-xtendini: from the antrrior mftlgj 

 the toot to the reetuni, leaflet- conical, compressed, tapering to a 

 point. (Old.) 



Shell minute, elongated-oval, slightly narrowed anteriorly, sub- 

 carinate, valves obtusely beaked, without distinct hit* ml ATOM, hut 

 marked throughout with coarse sublaminate ridges of increment, and 

 covered with minute punctures arranged in quincunx; ; 

 valve with an obtuse umbo. Color externally deep client 

 internally dull red. Margin narrow, thin, coriaceous, finely pubes- 

 cent, having at the inner margin twenty-six fascicles of short, rigid, 

 shining white seta), looking like minute polished tubercles. (Old.) 



Length 1\, breadth 2$ mill. 



Orange Harbor, Patagonia, on old shells and in tide pools. (U. 

 S. Expl. Exped.). 



Chiton castaneus COUTH. MS., GOULD, U. S. Expl. Exped. Moll., 

 p. 326, f. 411, a-c (not Ch. castaneus Wood, nor Q. & G.). Acan- 

 thochiton coutliouyi ROCHKBR., Polyplac. Cap Horn, p. 133. 



A small but very distinct species, most of the specimens were con- 

 siderably eroded showing that they had come to maturity. (Old.) 



The generic position of this form is problematical. It cannot be 

 an Acanthochites. Rochebrune gives no information except that it 

 was collected in the Strait of Magellan by the French expedition of 

 1882-83 to Cape Horn. 



CHITON BRODERIPI Potiez & Michaud. It is oval, rotund, thick, 

 of a brown or dirty white color; the dorsal line IB smooth and h; 

 ish ; the anterior valve is marked with a white spot at the summit, 

 and the posterior is swollen and retuse within ; these two valvesand 

 the intermediates valves are grooved, striated and somewhat gran- 

 ulated at the lateral areas from base to summit. Th- margin is 

 thick and leathery. Length 40, width :>0 mill, i I'. A M., Galerie 

 des Moll, du Mus. de Douai, i, p. 533, 1838). 



Sea of ( 



TONICIA GAUDICHAUDI Roclichrunc. Shell ovate, subcai in; 



shistaceous-tawny, pictured with small violaceous spots. Anterior 

 valve and posterior part of posterior valve concentricallv line 

 8 



