﻿C Y R E N A. 



Species 71. (Mus. Bvit.) 

 Cyrexa ci!assula. ('';//•. /<■.</<? altissima, SHhlr!(j('>ii!, 

 aii'jnstafa, suhairiiahi, tenulter liratd, crass,!, 

 cjjidi'nnidi' olivarcd iiidufd, ad apiccni iiitiisqiir 

 cwniled, rinhin,! ; Iiihir jn.^ti'-,) ,irrii,il,i, jinijie 

 marijinoii hilrnilrm iiifjnl'if<i : hihrr iinliru sidi- 

 r.r,;u;ito ; innbonibus iiiO' rr,ilis f,:re Intrraliti'r 



The thick Cykkna. Shell veiy liigli, subtrirjunal, 

 narrow, rather arched, finely ricltfud, thick, 

 covered with an olive epidermis ; bluish at the 

 tip and inside ; posterior side arched, angular 

 near the margin ; anterior side somewhat exca- 

 vated ; umboes curved inwards, almost terminal 

 at the side. 



MoDssoN ■ ? MS. in Brit. Mus. 



Ilah, Lebanon. 



Species 73. (Mus. Brit.) 



Cyrena AMIilouA. Cijr. testa, suhtriijoint, siidiaquilate- 

 rali, olivaceo-nigricanti, modcratr tuviidd. It iimHit 

 liratd; latere antico dediri, siiliroluialo ; latere 

 postico declivi, obscure biainjubit'i. 



The AMBIGUOUS Cteena. Shell subtrigonal, V.ackish- 

 olive, moderately tumid, finely ridged ; anterior 

 side sloped downwards, rather round ; posterior 

 side sloped downwards, with two obscure 

 angles. 



Deshates. Proe. /jooI. Soc. London. XXIL p. 345. 



Hab. River Euphrates. 



Species 74. (!Mns. Sowerby.) 

 CyKE.NA Manillensis. Cijr. testa crassd, subrhom- 

 boided, distanier liratd, versus umbones grised, 

 versus marginem siibaurantid, i)diis albd ccerules. 

 centi, epidermide nitenil iudutd ; latere antico 

 brevi, margin e dorsali declivi, laterali hrevi, 

 iruncato ; latere postico producio, margine dorsali 

 declici, ternunali truncato; imihonbas rutitudis. 

 The Manilla Ctrena. Shell thick, rather rhom- 

 boidal, distantly grooved, grey towards the 

 umboes, somewhat orany-e, bluish-white within. 



covered with a shining cplJennis ; anterior side 

 short, dorsal margin sloped, lateral short, trun- 

 cated ; posterior side produced, dorsal margin 

 sloped, terminal, truncated; umboes round. 



PiiiLiiTi. Abild. Zeit. f. Malak. 184L 



llnb. .Manilla. 



Species 7.J. (iLis. Brit.) 



CvUEN'A XKrKAXK\SIS. ( 'ijr. frsh! sllbrh, nubni,!,',, .filsr, 

 r,l anr„„t;,K ,n-fd. 'brrnj,,!.!, r,„„y,r, ..,? ; Ider. 

 a,iln-n l,rrrh).<cill,.: In/rrr ,„,sti:u ul.oiis onHlllrl,. 



bili Inmratn 



'/'"•■ /""■ 



<((/.. 



bursal! nlriwiiir trritrr deeli 



vutr.di 



recliitscvln. 



The Nepean' Cykexa. Shell rathrr rhomboidal, 

 brown or orange, straight, smooth, compressed ; 

 anterior side rather short ; posterior side more 

 produced, broadly truncated ; apex small, some- 

 what acuminated ; dorsal margin slightly sloped 

 on each side ; ventral margin rather straight. 



Lesson ? MS. Brit. Mus. 



Hal,. River Nepea. 



Species 7G. (^his. Brit.) 



Cyrena EEGULARIS. djr. Irstd jmllid,!. suhnratd. sub- 

 depressd, regnlaritrr rrrbri liratd: latvre antico 

 breriusculu, y-iibacnaiuafn, i„/ra n,„bn.,,s r.ccacatn; 

 latere postico lat'e truncato, nau-girie dorsali declivi : 

 unibonibus obtusis, deprcssis. 



The regular Cyrena. Shell pale, rather oval, rather 

 depressed, regularly, closely ridged ; anterior 

 side rather short, slightly acuminated, exca- 

 vated below the umboes ; posterior side broadly 

 truncated, dorsal margin sloped ; umboes obtuse, 

 dejjressed. 



Prime ? MS. Brit. Mus. 



I/ab. ? 



Species 77. (Mus. Brit.) 

 Cyrexa OVALIXA. Ci/r. trsi,! oratd,tiiinidd, cpidermidf 

 aittnti, nigrcscenti iudutd, rugis distant ibns. M!y,<;- 



