Y L D I A. 



Figs. 10, b, a smnll palli.i vari.-iy of V,.i,i.ia Oiuisa, 

 .So(c//., see Plate II. 



Species 22. (AIus. .'copied.) 



Y0LD1.\ AHY.S.SICOL.-i. Yol. tesid Jll.-^r,). jnirn't. i.rillo-.^lil,- 



Irifjond; latere post ico mhuniiiiiii^it>i. inh/nlnlc. dini 

 postaiiffiilari depressd, tcrmino Innndto, maiyiiu 

 (lorsali declivi ; umlionihiis aciiminatim elevalh ; 

 nmrijine ventrali semihiiiari, latiie niitico hirmiK- 

 niiv, rotundo. 



Tm: DEti'-.sE.\ YoLDiA. Sliell lirowji, .Muall, ovale-sub- 

 trigoual; posterior side suliaiiiiniiiate, angular, 

 postangiilar area depressed, end truncated, dorsal 

 margin sloped; iiniboes aeiiniinatoly elevated; 

 ventral margin semilunar, anterior side rather 

 short, rounded. 



TuHELL. Spitzbergeti Moil., p. H'.l. |)l. 1. I'. 4. 



Species 23. (Fig. a, //, Mus. Brit.) 



YoLDlA SPLENDim-I.A. Vol. tist<1 lililliiti'l, sillHinilil 

 Iffvu/nfa, parril, iiitenti,fii!'rii.< rmu-ntlrifi^ ^IriiinWi . 

 latere poslicn declivi, truncatn. piaducto ; tuti'n 

 aiitiro breviilsculo, marr/itw dnivnli declivi. 



The splendid Yoldia. Shell minute, suliovate, sniootli 

 small, shining, striped with eoneentrie band.:: 

 posterior side sloped, truncated, produced ; an- 

 terior side rather short, dorsal margin sloped. 



A. Adams. MS. in Cum. Coll. 



Hah. ? 



A pretty little species, more trigonal and le.ss curvec 



upwards than Yoldia lucida. 



rsin .-.loped, umbnes 



Species 24. (Mus. Brit.j 



Y'OLDIA ABBREVIATA. Yol. te.«td ilia></Uidit,r .1ld_/lri(/0!ld, 



compressd, lata, hra:i, /a'ri,/,itd ,- lat,-re pogtiro 

 brevi, subacuiiiiiiato, uianjiiu il,„:-^,i/i ralde declivi, 

 area definitd ; termin,, truncato .- latere antico oblique 

 subrotundato, maryine dor.<idi decliri, umbauibiis 

 elevatis. 

 The abbrevi.wed Y'oldia. Shell inequilateral, subtri- 

 gonal, compressed, broad, short, smooth ; jiosterior 

 side short, subaeuminated, dorsal mar<rin nuieli 



obliquely snliroti 



elevated. 

 So\vi:i!iiV. 



/lah. Falkland Island 

 'I'his shell seems t. 



S]jecies 25. (Fig. '/. //, .Mus. 'I'aylor.) 

 YoLlilA LAIUATA. Yal. te.<td s,dda„re„h,t,i, teiuii. sic, 

 mined, nitenti, co,npre.<.<d, „n,/io nidialiiii i,„i.<al- 

 ratd : lat.re pnslic,> s,ih,ic,imi ,iata, mm/ine reutra/i 

 siirsiiiii aecliri. tiniiiiii' li-imrafn, iiianjiiti doi-sali 

 compre.^.-^o.coiin.ci labials : lal, n ,iiiJir„ snhrot„„dn. 

 inargine dors(di sid/coiiipee.t.<i'. ciiiirej-c. 

 The LIITK:. YoM.ia. Shell a liltle lan,v,,iatr, thin, 



straw-coloured, shining. ipirs.. ,1. uitli a radi.at 



ingsulcusin the middle: po-hin.i- side subacunii- 

 iiated, ventral margin sloped u|iuards, end trun- 

 cated, dorsal margin compressed, conve.xly lijiped ; 

 anterior .side a little rounded, dor.sal margin sub- 

 compres.sed, convex. 



sloped, area defined 



truncate 



•side 



//„/;. .> 



This species is distinguished by thr soniewhal c 

 ve.x prominence of the dorsal margin, and I think y 

 that the radiating groove in the centre of each vahi 

 .so exactly alike in the only two specimens I have s( 

 as to discredit the idea of its being accidental. 



Species 2 (J. (Mus. Brit.) 



Yoldia Eightsi. Yol. te.^td „vatd. lata, rm.<.-!d, epid.r- 

 mide vlivar,,.-ni./nsr.„t; hre!,,at„ iialald, i, u,,ih I la- 

 teral i : lat.n ,,..si;.i, /.r.ri, „ht,i.<i trm<rat.,. „n,r;inn' 

 dorsali nmcar,^-d.pr,.<.--a. and d./iiatd: umb.iiila,.-. 

 subretrords, margine rentndi .<' miln mild : lat,rr 

 antico prodiicto, mare/ine dorsali ci.iin .i-i,-d,rliri. 



EiGHr's Y'oLDLA. Shell ovate, broad, thick, covered 

 with a blackish olive smooth epidermis, ineipiila- 

 teral, posterior side short, obtusely truncated, 

 dorsal margin concave-depressed, area defined ; 

 umbops turned .slichtlv backwards; ventral marain 



