llM ISCIIN'M HI TON. 



ther with the end valves, irregularly. suhconccntrically and 

 >t ron-jlv c,.rni'_rat( <1. Mucm median, planate. This -pr<-i- i- a 



ii/iij- in furin, but & true Itchnoehiton in its imbricated scales, 



which arc. bowever, extremely minute. This specimen is n-iruhirly 

 arched. much less elevated than the type, with which, however, it 

 agrees well in particulars. Length '_M, breadth ! mill. (( 



I am unable to see why this should not he considered a .sVr///y/A/./-, 

 imles- it !>e on account of the smaller girdle scales; but, as I have 

 not seen specimens, I deem it be.-t to leave the specie- when- ( 'ar- 

 penter placed it. 



I. SUBCLATHRATUS Pilsbry. 



Shell suhrotund, depressed (at an angle of 130); brown-olive; 

 valve- very wide, the margins lobed, interstices nearly straight. 

 Intermediate valves granulated at the dorsal ridge and more or [em 

 all over, having two strongly tuberculate ribs, one diagonal, the 

 other in front of the suture; lateral areas small, granulate; central 

 areas having four longitudinal bars on each side, the bars tuher- 

 culate, interstices granulated. Front valve having about eleven 

 rounded, suhtuberculate radiating ribs. Girdle very wide, having 

 close small scales ; valve-margins simple, the anterior having 9 slits. 



Length 41, breadth 3 alt. -5 mill. 



, under stones. 



Lepidopleunu rluthrnhi* CPR., Mazat. Cat., p. 1 05 (1857) , /W//o- 

 r/tifhr'ifnx (Vi:.. J/& Not Cli. r/'itlirntu* Ri:i:vi:, Conch. 

 Icon., pi. xviii, f. 113 (1847.) 



I have not seen this species, the name of which ha> been already 

 used by Reeve. Carpenter write- as follow.- : 



One very small specimen was discovered on a stone to which a 

 Crucibulum had been attached, beautifully perfect except in the loss 

 of the anterior valve. A dead anterior valve was found of a much 

 larger specimen displaying a marginal structure like that of /,. 

 The shell is remarkable for the Mrong bars across the 

 central area-, and the stout rows of tubercles which run, tin- 



-nally. the other along the inteistitial margin. The mantle is 

 v.-i-y hr..ad and crowded with minute Males. '/"*.) 



I have no opportunity of re-examining the type of this minute 



shel. bether the very minut n-e sti-iated. If so, it 



mii-l clotdy re-.Miihle the young of /. . The jiaucity of 



