l r < ll\<" III i 

 genuine Ttchnochitont in the Gulf fkuna i- n-mark:ih|'-. 



so many .-prcie.- ;nv found I'urtlirr north. < '///. l/> 

 Section Lrj,i'iln;nnn Pil-hrv. I 3 



LepuJopfetmi* CARPENTER (Table of lirgular chiton- 

 DM i.. Proc, r. B, Nat. MII-. 1878, p. 881, type / Mdd. 



\ ,| LtpidopleuriU of Ki--<>, Hi-t. Nat. Kiir. M'-rid. iv, p. 

 iX'Ji!, nor of II. iV. A.ADAMS, L 858, HOT of CARPENTER, Ma/at. 



Cat i 



Valves having sharp but somewhat, rugose and tliick in>ertii.n 

 teeth, and Mypically) the sinus is delicately toothed within. (Jinllr 

 covered with convex scales, usually snioot liisli. Type /. mer\> 



This section diflers from Ixcluxx-hitnn not only in havini: the gir- 

 dle scales convex and smooth or hut slightly striated, hut al>o in 

 the toothed sinus. It is, however, an artificial L r rouj>, the species 

 being more closely related to a number of diverse /.W///W//Vo//x than 

 to each other. Numerous transitions from the smooth convex 

 scales to tlat striated scales occur, the variation in degree of stria- 

 tion being considerable in some species. This section in its present 

 limits is therefore merely a temporary expedient for convenience in 

 identifying species. It should rank as a section under Minorhif<>n 

 s. s., rather than under Isehnoradeia, to which group these species 

 have no especial affinity. The status of the name Lepidopfatnu 

 has been discussed on page 2 of this volume. 



I. MI- UTKNSII Middendorff. PI. 26, figs. 20-26. 



Shell oval, elevated, with angular dorsal ridge, and straight -side- 

 slopes. Varying in color from orange-red to claret-red, or even 

 dark red-brown, and either unicolored or speckled and blotched 

 with white. 



The lateral areas are elevated, and sculptured wiih radiating rows 

 of elevated pUStuleft Standing upon a smooth, almt tlat ground; 

 the pustules of the SUtura! row often irregular. Central area- hav- 

 ing acute, narrow, parallel rai-ed riblets, the intervals bet ween them 

 regularly latticed across, except at the dorsal ridge, where the 

 rihlcts have a tendency to diverge, and the CTOBS hatchi letfe 



End valves radially pustulo.-e. Mucro central, low, tlat and incon- 

 spicuous. 



Interior white or blue-white, the median valves when det-ached 

 showing broad red-brown ray.- po.-teriorly. the end valves with 



