UBBOIA.. 



that species in (lould's Invertebrata of Massachusetts (fig. 



mu>t represent an extreme variety. 



!: \. m\. Watson, IM. i;i. ii<_r. no. 



rmhilicated, thin, t ran>liiceiit. whitish; whorl- 4. rounded, 

 spirally carinated, carin:e ~> on the upper part of the last whorl, 

 wilh several less distinct ones on tin- base ; outer lip sharp, varicose 

 externally. Length. \"2~* mill. 



N. of Oalebra IsL, West Indies; 390 fms. 



K. M .i:< mi.rollin. PL 69, fig. 66. 



Narrowly i>erforate, seinipcllucid, yello\visli brown, apex obtuse; 

 whorls 4, convex, with channeled suture, spirally ridged, about 

 eiirln ridires on the last whorl. Length, 3 mill. 



Siberian Sea. 

 R. ( \I:IN AIA, Mighels and Adams. PL 63, fig. 76. 



Shell very thin, ferruginous ; whorls 5, convex, the upper ones 

 with longitudinal ribs, the lower half of the body whorl spirally 

 siriatr: aperture nearly orbicular, peristome thin and sharp. 



Length, 2'6 mill. 



Mt'iiie, northwards. 



1 1 is R. semicostata, Migh. and Ad. (not Mtg.), and R. pelagica, 

 Stinipson. 

 II. UEDOVD, Watson. PL <I4, fig. 91. 



Uathrr strong, subtranspaivnt, white, apex blunt : whorls 5, 

 Convex, .-pirally lirate, about 15 on the last whorl, the inter-: 

 much wider; outer lip sharp, thin. Length, 2'") mill. 



Nightingale IsL, Tristan da Cunlni : 100 to 1 ">o fm>. 



II. nUJnUEW \. \Vat>on. PL C4, fiir. 100. 



Narrowly umbilicated, apex obtuse, tran>luivnt white; wh'.rl- 

 5-5 i, moderately n.unded, with a smootli space below the suture, 

 then -piral threads, Hi-l* ,, the body whorl, separated by wider 

 interspaces; outer lip-harp, with a feeble external varix. 

 Length, L'-o mill. 



90H Mnrin,, ntnl l^-inci- AW//v//v/ />. ; 140 fins. 

 M in\. Wat>o,,. \>\. r,|. fi : 



Scarwl -iihtran.-parent. suture scarcely impressed, 



\\hite: whorl> .",. narniwly. CMm-avely shouldered, then convex, wit h 

 faint -piral tlin-aii> and \\ idi-r intei>|iaer< : lip sharj). with a remote 

 external \;iii\. Length, 'J-.'* mill. 



:;."ii) fms. 



