'I . 



roinci \. 



teeth finely crenulated oiilsidr ami at ed'je, rather thin, and 

 colored ivd. A- in other -prrirs liavini: a po-h-rior mncro, the tail- 

 valve teeth art- directed forward. 



< iirdlr yellowish, leathery, nude and smooth. 



Length L'*, luvadth 1 : mill.; divergence 108. 



Callao ; and Chili (U. S. 1 



This species differs from all of the T. vtcgans group in lacking 

 sculpture upon the central areas and engraved grooves along tin- 

 dorsal ridge; and from other species of Toniria in the red sutural- 

 platcs. teeth, etc. The blunt inucro is posterior, and the teeth in the 

 tail-valve are directed forward. The posterior margin of the tail 

 valve is broadly waved upward in the middle, as in Eudoxochiton. 



T. HORNIANA Rochebrune. PL 43, figs. 50, 51. 



Shell ovate-elliptical, carinated, rufous, marbled with buff and 

 roseate ; anterior valve radially costate, posterior valve small ; inter- 

 mediate valves having the central areas minutely concentrically 

 striated; lateral areas multi-sulcate and ornamented with two lines 

 of dots. Marginal ligament dull roseate. 



Length 19, breadth 14 mill. (Eochebr.') 



Orange Bay, Patagonia. 



T. horniana ROCHEBR., Polyplac. Cap Horn, p. 139, t. 9. f. 7. 



T. M ARTIELI Rochebrune. PL 43, figs. 48, 49. 



Shell ovate-elongate, strongly carinated, the ends of the valves 

 curved backward, brown-rose, anterior valve radially strongly 

 costate ; posterior valve small ; intermediate valves having the 

 central areas transversely lineated, lines denticulate; lateral areas 

 granulated and margined by asquamate hand. Marginal ligament 

 violaceous-rufescent. Length 21, breadth 14 mill. 



Strait* <>f Miiyltitn. 



T.martieli ROCIIKHK., Polyplac. Cap Horn, p. i:J!, t. 9, f. 8 

 (1889.) 



T. LI.HKUNI Rochebrune. PL 43, figs. 52, 53. 



Shell ovate-elliptical, carinated, shining, violaceous or greenish- 

 roseate. End valves radially most minutely striated; intermediate 

 valves having the lateral areas covered with tubercles ; the central 

 areas concentrically silicate, the sulci wavy; marginal ligament 

 narrow, leathery, whitish- violaceous. 



Length 29, breadth 12 mill. (AV//e6r.) 



Punta Arenas, ran y /: . >' ; . //' .1A/;// ////. 



