NO. 1139. i>i:i:r-w.iTEi; MOLLUSC. irEi; HILL .L\I> r.rxn. 827 



CHLAMYS Bolten, 1798. 



f'hlitiiii/s lioi.TKN, Mus. Holt.. 1st f<l., p. lt;f>, 17!S, restricted. FISCHER. 1887 

 i liars). 



SrinMACiiKK, 1817 (restricted). VERRILL, Trans. Conn. Acad., X, pp. 58, 

 89, 91, 1897. 



/Hirn" and Clilum/i* i><u-.x) II. and A. ADAMS, l.xr.S. CIIKM, ist!2. ZlT- 

 TICL, 1881. 



SKILIC/.KA. 1871 (restricted). 



Type. Chiton ijx islandica ( M filler). 



The original type of this genus is identical with P. inl{i>t<li<-tix ( Miiller). 

 Therefore this should be adopted, without question, as the true type, as 

 has been done by Fischer and others. 



The typical species of Chl(inii/s are high, rounded, somewhat oblique, 

 nearly equivalve shells, with large inequilateral and oblique auricles, 

 a large byssal notch, and several pectinidial teeth. The surface 

 is strongly radially sculptured, with both primary and numerous 

 interpolated ribs, increasing in number with age. The ribs are gener- 

 ally crossed by concentric sculpture, often forming rough, scale-like 

 projections. The margins are scalloped and the shell closes rather 

 tightly except at the byssal area. The inner surface has ribs and 

 double tlutings, corresponding to the external grooves and radii. The 

 hinge-plate has generally two slightly divergent ribs on each end. 



PALLIUM Schumacher, 1817. 



Smi'MAriiER, 1817. II. aiid A. ADAMS, 1858. CHENU, 186L'. STOI.H-ZKA, 

 1S71. ZITTEI.. 18S1. FisciiEU, 1887. VERKILL, Trans. Conn. Acad., X, pp. 

 59, Sit, 111, pi. xxi, lig.4, 1897. 

 Deiitipeclen K'rpi'EL, 1835. 



Type. Pallium plica (Linnaeus). 



The special feature of this very distinct group is the development of 

 several (usually three) well-marked, nearly transverse, blunt teeth, 

 alternating with distinct pits on each end of the hinge-plate. The 

 shell is elevated, rather thick, with external, large, obtuse or rounded 

 radial ribs or corrugations, and with internal, angular, double or bicari- 

 n ate ribs opposite the external grooves, near the margin. The auricles 

 are small, but high. The hinge-teeth are marked with distinct cross 

 lines. 



HINNITES Defrance, 1821. 

 llhniitcs VERKILL, Trans. Conn. Acad.. X, pp. 59, 89, 91, 1897. 



Type. Ifinnites cortessi Defrance. 



Shell free and much like CM<nni/x, when young, but later in life it 

 becomes attached by the right valve and irregular. 



