I R I D I N A . 



S|)icii's :;. (:\Ius. Sowerby.) 



)INA ciELESTIs. Irklji'slii l('iiui ,sitbiiijlala, tfloiii/dlil, 

 aiiijmtu, ulrinqne Jdaiiii, heriyatd, profundi; o/lrmvii, 

 intun cteraleu, marr/itie canfmaU sbiipUri, l/eviyulo ; 

 Intr-rf /loslico j)roihicfo, ohfifjiii- stihaiiiinUiti). ti-rm'ino 

 (icniiiiiiatn, i/nirqi)/e (/iij-nii/i rrc/o. iiiiiri/ijic l/i/cru/i 

 /.Tnj/j/i///iu, wurijiiif ri'iifru/i oil ti-niiiiiihii siirsiini iic- 

 cliri, medio su/tcoii/niclo ; la/i'fe initico siibciDinilo, 

 tiiiinjhii' dursali redo. 



: ( i:l1',stial Iridina. Slu-11 thin, subiiitlated, cloii- 



sinootli ; posttirior side produced, obliqiitly sub;m- 

 gular, end acuniinated, dorsal margin striiight, lateral 

 margin very oblique, ventral margin sloped upwards 

 at till' cud, slightly contracted in the middle ; anlc- 

 riiir >ule >ul)cuoeate, dorsal margin straight. 



es 4. (Mus. Sowerby.) 



'ifor 



I'lviigutii, inilh-i- Iiiiiiili, teiiiii, levitrr coiiceiilrici riiijalii, 

 o/iracni, iii/ifi ciriiPf iridcsceiili, margine cnrdinali 

 hrriyiito, uiitice ubsolethsimi' creiiiilulo ; latere postico 

 I'.v/iaiinu, rotuiidalim fiiigidato, ohliqiie iirflato, marglne 

 dorxali elevuto, iiKirginc laleruU obliijiio, teriniiio iicii- 

 tiiiiialihi rnhiiidiitu ; iiii'din di'pressn, grndiit'ihi roii- 

 tnirlo. bui nihil- doruil i simiato ; latere uiitlco aiiiiii.stii. 



i,,uely subeuiieilorni, 

 lighllyenurentrically 

 •eut within, cardinal 



margin smooth, anteriorly very obsoletely crenulated ; 

 posterior side expanded, roundly angidar, obliquely 

 inflated, dorsal margin elevated, lateral margin 

 oblique, end acuminately rounded ; middle depressed, 

 gradually contracted, dorsal margin sinuated ; ante- 

 rior side narrow, acuminated. 



So\VERBY, Zoological Journal, vol. v. pi. 2. 

 Anudon d/ibiii, Bosc. 

 Iridina Oiidmei, Den. 



Iliih. Senaar. 



-More cuiuirorni and more inflated than Iridniu eluiigiita, 



which is of a mure rhoudjoidal form. 



Species 5. (Mus. Sowerby.) 



1 1! nil N A ANGUsTATA. hid. ti'-std eloiigafd, aiiguUatd, nub- 

 riiiieifiiri.ii. initici- Iiiuiili, jirnfniid'e olivaced, lavigald, 

 uitiix r<i riileiiiridescetifi, niurgine cardiuidi l/evigatd ; 

 latere /lustico siibexpanso, mbalato, iMiqne iiijiulo el 

 riilinidiiti:./ uiignlato, ared postiingulari depresso, t/iar- 

 giiie dnrsiih recto, siibelevato, murgiiie luterali ohliquo, 

 termiiiu triiiiciito ; medio gradatim aiigustato, margine 

 ri'ctiiisciilo ; latere aiitico producto, angiixto, margine 

 dursali depremo, termino supra cnneato. 



Tin: NAiuiow Iridina. Shell elongated, narrow, sub- 

 runeiform, gaping in front, deep olive, smooth, blue- 

 iridescent within, cardinal margin smooth ; posterior 

 side subexpanded, subalate, oblique, inflated and 

 niuiuh'dly angular, postangular area depressed, dor- 

 sal margin stiaight, slightly rai.sed, lateral margin 

 oblique, end truncated; middle gradually narrowed, 

 margin rather straight ; anterior side produced, nar- 

 row, dorsal margin de|)ressed, end cuneate above. 



SoWEUBV. 



JJitb. Africa y 



Much narrower and less oblicpie than Iridina Kihtica. 



