( III 



mi. 1.^1 ami s.li.l, closely imliriral in-, rarely separated. 

 Type n/ntiix Limn'. 



mt. ( iinllr willi <lnu-t Kristles. 



mis XIII. KUDO \OCHITON8huttleworth. 



Valves having several side-slits in each insertion-plate, the 

 suturul-plates continuous across the sinus, which is represented by a 

 mere wave; girdle leathery, heset with short, stiff bristles. Type C. 



no In /is Gray. 



AA. Eyes developed on end valves and lateral areas, 

 a. Girdle leathery, nude or nearly so. 



Genus XIV. TONICIA Gray. 



Valves having pectinated insertion-plates ; sutu nil-plates separated 

 by a squared denticulate sinus; eyes developed in more or less 

 regular rays on forward part of lateral areas and on end valves. 

 Girdle leathery, naked or with a few hairs. Type C. elegans 

 Frembly. 



aa. Girdle covered with spines or spinelets. 



Genus XV. ACANTHOPLEURA Guilding. 



Valves having pectinated insertion-plates with one or several side- 

 slits, the teeth in the posterior valve directed/orward instead of out- 

 ward ; sinus denticulate or smooth ; eyes small, scattered among the 

 granules of the surface. Girdle bearing long calcareous spines, or 

 closely clothed with short ones. Type C. spinosns Brug. 



Genus CHITON Liiiirf, 1758. 



Chiton L. Syst. Nat. edit, x, p. 667 (first recognizable species C. 

 tuberculatus*) ; edit, xii, p. 1006. SPENGLER Skrivin- at' Naturhist. 

 Selsk., 1797 (first species C. tubermlnlH*}. LAM.M:< K, I'rodr. 

 Anim. s. Vert., p. 90, 1799 (sole example fit <s). 



WOOD, Gen. Conch, and Index Test. (C tuberculatus the first 

 species). GUILDING, Zool. Journ. v, p. 27, (example, C. sqnamonu 

 &OVfB.=tuberrulatu#).l rBAY, I'. /. S. 1 - >, 06. Sun i 



Bern. Mittheil. iv, p. 72. CARPIOM 1:1: A- D.M.I.. IV . I'. S. Nat 

 Mus. i, p. 300 (1878), type C. tnbercuhttus. Not Chit,,,, II. ^ A. 

 AD., Gen. Rec. Moll, i, p. 474 (1858.) 



Lophyru* (in part) POLI, Test. utr.Sicil. i, mnltn-ntri'i, p. 2, 4, etc. 

 H. A A. ADAMS, Gen. Kr. Moll, i, p. 46!> -in part.) 



