i ii \< 111 i 1 1!> 



tion, from tin- contraction of tin- epidermal film. I >r. Gould 



mi-"d that tliU ipecitt mirht t<> lie :i Lucia, i 



the Pacific Is.; hut it is a normal l-chnochiton in all respects 



except the non >triation of I he scales. < ( ///.) 



I. m-< i i.i-i i > ( 'arpeiiter, n. sp. 



Shell small, oval ; juu'iim acute; miicro me.lian, rather elevated; 

 :i>hy, maculated with olivaceous. Entire surface minutely gnmu- 

 lose ; central areas having about 10 distant, acute, subparallel lira-, 

 sometimes siih^ranose, the interstices wrinkle-decussated. Lateral 

 areas scarcely raised, ha vim: distant, small, much raised Drains, Mih- 

 radiately arranged in --4 scries, the end valves having 16-20 such 

 series. Interior: posterior valve having 7, central valves 1, ante- 

 rior 10 slits; teeth rather obtuse, roughened but scarcely pectinated 

 at the margin. Eaves small ; sinus small, deep, smoothly laminate. 

 Girdle rather regularly imbricated with decidedly transverse, con- 

 spicuously striated scales. Length 11, breadth 6 mill. ; divergence 

 120. (<>/.) 



/ Hong Kong (Stimpson, N. P. E. E.). 



" Chiton f pulcherrimus Sby." GOULD, MS. + C. (Leptochiton) 

 craticulatus GLD., Otia, p. 117, pars. (Cpr.). 



The shells forming the five species, pulcherrimus, craticulatus f cul- 

 tratus, bisculptus and asperior were included by Dr. Gould under 

 the first two names. They need a careful examination of the 

 details of sculpture, as well as of the mantle scales, in order to sep- 

 arate them. Of these pulcherrimus and bisculptus have the striated 

 scales of Ischnochiton ; craticulatus and cultratus, the strong, smooth 

 scales which belong to Lepidopleurus ; and asperior is intermediate 

 between Trachydermon and Cha3topleura. The decided; rugosity of 

 the insertion plates and short eaves of this species form a transition 

 toward Chiton. The whole group appears to have a slight lamina 

 at the sinus, marked off by a slit from the sutural wing. (Qw.) 



7. Group of I. interstinctus. 



Small, finely granulated shells, the lateral areas radially ribbed. 

 Scales striated. Species of the west coast of North America. 



I. IM KKSI IN. n s Gould. PI. 11, figs. 40, 41 ; pi. 21, fig. 



Shell OVal-oblong, rather elevated, the dorsal rid;:* 1 ohti: 

 keeled, side slopes nearly straight. Surface apparently smooth, but 



