UNO, IN i. 



Interior \\hili-h ; :uiti-ri>r valve bavin itral I , . 



valve ! >lils; teeth .-harp, liiin :in<l .-inonili ; . 

 ( lirdle naiTo\\ , alternately olive In-own and \\ In 



\vr\ minute, imbricating striated .-rule-. 



Length -S', breadth ."> mill. 



Lengtfc -V. breadth > mill. 



JuiH'iini (Adams i ; Murt-n, X \<ni<> l\<u //,// A 

 llrmpliill). 



Chiton papillosus Av.< PI-.H-. ii.,.-t. >.<-. N. II. i^i:>. [..!. C. 



^opi^/oatw SHUTTLW. Hern. Mitthcil. l- s ">-'), p. 77.- / 

 lil>il!nu DAI. i., (atal. Mar. Moll. S.-K. U. S., in Hull. :J7, I 

 Nat. Mus., p. 17L'. 



This is the smallest of our Florida or West Indian I-rlmoid-. It 

 lias much the same sculpture as the small Leptochitons, being uni- 

 formly granulated and having the lateral areas very indistinctly 

 defined. It is readily known from other Ischnochitons by these 

 characters. The original description is as follows : 



Shell small, wide ; greenish, closely maculated with whitish and 

 black; papillose; areas separated by a slender riblet; girdle very 

 finely scaly, alternately greenish and white. 



Length 5'25, breadth 3'25 mill. 



I. ITNCTCJLATISSIMUS Sowerby. PI. 21, figs, oo- 



Shell oval, moderately elevated, the dorsal rid^u bluntly angular, 

 side slopes nearly straight. Surface apparently smooth, but seen 

 under a lens to be minutely and evenly granulated all over. Lat- 

 eral areas ill-detined. Flesh colored, speckled or dotted all over 

 with light brown, and often maculated on some of the valves or 

 along the dorsal ridge with dark brown. 



Lateral areas demarcated by a very low and obtuse ridge, obsoletely 

 sculptured by the intersection of two series of obliquely radiating 

 curved impressed lines; central areas similarly sculptured by 

 obliquely longitudinal lines. Umbo of posterior valve in front ot' 

 the middle, the posterior slope concave. Interior bine-white, having 

 9-12 slits in the end valves, 1 in the median valves; to-ih acute: 

 eaves moderate ; sinus wide, flat. Gird!. 1 with -olid, flat- 



tened, striated imbricating scales. Length 17, breadth Id mill. 



Bay* of Callao, Mexill<me, Ljiufj" 

 on dead shells, 6-10 fins. 



