1-" I-' !i.\<M mi-ox. 



under a lens it is seen to be very minutely punctulate, the indistinct 

 lateral areas hein.i: ohsoK-tely radiately lirate also. Dark reddi.-h, 

 mottled with liirlit on the dorsal ridge. 



The lat.-ral arms an- >carcely perceptibly raised and besides Ix-in- 

 microseopieally punctulate like the rest of the surface thev have low 

 radiating ribs. al)oiit 6* or 7 in number. Central areas evenly 

 punetulate: end valves punetulate and radiately multilirate. 

 I'ml.o ,,f posterior valve in front of the middle, rather elevat. d. 

 Inside: posterior valve with ll\ anterior valve 10, median valves 

 1 slit ; teeth acute, eaves moderate; sinus wide, flat. 



(iirdle densely covered with small, suboval, delicately striated* 

 scales. Length \^>. breadth 8 mill.; divergence 110. 



Xifk'i ll'irhor mnith t<> Monterey and the Santa Barbara la., Cali- 

 fornia . 



Chiton interxtinrf,,.* GLD., Proc. Bost. Soc. Bost. N. H. ii, p. ] \:> : 

 M.,11. T. S. Expl. Exped., p. 315, pi. 23, f. 423 ; Otia, p. 230, 2 1_\ 

 Ischnnr/iit'tH i ,itcr*liii<'tn* Cn:., .1/N. isj)!, and DALL, Proc. U. S. 

 Nat. Mus. 1878, p. 331. 



This is a small reddish species, characterized by the fine pun ela- 

 tion of the whole surface and the rather coarse but low radiating 

 riblHs of the lat.-ral areas and end valves. The sculpture is not 

 well shown in ( iould's figures. It is drawn from a specimen before 

 me in fig. 39 of pi. LM, representing an enlarged half-valve. 



I. M:\V( -MI;I Carpenter, n. sp. Unfigured. 



Sh.-II small wide, tumid, with obtuse rounded ju<:um. Mucro 

 median, rather elevated. Ashy or olivaceous, ele-antly clouded; 

 central an ;i~ and entire surface -raniilated, the granules being 

 <|uincuncially arranged, close and regular; lateral areas scarcely 

 defined, having abou! 4 lines of tubercles which are hardly elevat. d. 

 Posterior valve having about 30, anterior valve 40 such lino. Inte- 

 rior: posterior valve having 12, median 1, anterior valve 11 slits; teeth 

 acute; eaves apparent ; sinus wide, short, scarcely laminate, (iirdle 

 imbricated with large striated and rather regular s-ale>. Length 



83, breadth <i mill. : diver-enee 100. (Cpr.) 



Sta. Catalina Is. (Newc.). 

 The phm ,,f s Milptuiv somewbal resemblee that of /. interetindus, 



though coarser and diflJ-n-nt in d.-tail. It resembles /. rod 

 ' Illost ' :! in the rounded U-ak ; md larger cales 



(Cpr.) 



