﻿(i A S T 1{ (' II .K N A. 



Spenos 0. (Mils 



GASiTHO>'H.KN'A RkTZII. (ills. Icsla nl,l(,iiijd, siilictlfiri. 

 fiiniii, iiniici- attt'uuatd, tujlald, ten ill ; epidermidf 

 jliirnso'iiti indiifd ; latere jxislico late truncatu ; 

 ared poMed trhjond. eleratd; ared dorsali de- 

 prcssd, angtistd; liintii itinjitiin, lutiaxiinii, Jr,e ad 

 tei'ininum pO)!licnm i;itriis,i. 



RktzIUS's GASTKOCll.t;NA. Shell (vlilmii;. rjltlliT cunoi- 

 foriii, anteriorly ;ittc'iiualril, iiiHatt'd, tliiu ; 

 covered with a yt'lluuish e|iiilrriiiis ; posterior 

 side broadly truncated ; posterior area trigonal, 

 raised ; dorsal area depressed, narrow ; hiatus 

 very large, very broad, extended almost to the 

 posterior termination. 



Deshates. Conch, ile Reunion, p. 7. 



TJah. Isl. Bourbon. 



Species 7. (Mus. Sowerby.) 



(j-ASTROCHiENA PuiLlPPINENSIS. t!(is. trstd ,t uij n.-'td, rrr. 



fiufcuhi, tenui, tenuiter ft distmiti r rJei-dtn-Mrinld ; 



latere antico acuiiiiiidtn, lale Iiianle ; hiterr jn's- 



ik-o suhaciiminato. 

 The PHiLiPPrNF, Gasteoch^na. Shell narrow, rather 



straight, thin, with fine, raised, distant strise, 



anterior side acuminated, broadly gaping ; pos- 



terior side rather acuminated. 

 Deshates. Proc. Zool. Soc. 1854. p. 328. 

 Hab. Isl. Zebu, Philippines. 



Species 8. (Mus. Brit.) 



GastHOCHJINA DENTICULATA. (las. ie.<td hrer:,nlld, iii- 

 jlatd ; medio subdepreiiad ; hitn-r autiro ante luii- 



bonein paulo producto, nldiqii'' x/i-ny eleratig 



mimitisslme deiitieulafis sculjitn ,■ Im'tu niidi'irri. 

 The denticulated Gastkoch.ena. Shell short, 



high, inflated ; slightly depressed in the middle ; 



anterior side a little produced in front of the 



umbones, sculptured obliquely with raised, very 

 minutely denticulated strise ; hiatus moderate. 



T)kshayi:s. Proc. Zool. Soc. IS-^O, p. :i28. 



//,-/,. W. ColurnlMii. 





Spe, 



I'ront part of this sliell is siii- 



(Mus. Sowerby.) 



("lASTIIocil.KNA ri:iTI.I.AlA. '.''(>■. I> ^<ld niKflfoiwi, 

 ,-,v, ...-,; ,■ lotrrr .n,t„;, A,vr/w/<,..', .(//(//(.-.■//.•is/m, .- 



hllrrr lu.^ln;. I.,t.' ,,,/;,.,<.<... r,r.<„, l,:„>ull,w , ,,- 



ritlMo; liHilii urato, „,edi„.-,; : cardi'nr dr.iid-Hy 



iiuifjuis. 

 The hooded GASTKOCIl.t.VA. Shell cuneiform, thick ; 



anterior side very short, very narrow ; posterior 



side broadly expanded, hooded towards the end ; 



hiatus ovate, moderate; hinge with large teetii. 

 Dkshayf.s. Proc. Zool. Soc. 18.",(;, p. :ii'.K 

 H.ih. W. Indies. 



A l;u-ge and remarkable species, with a peculiar 

 hollow convexity in the valves tow-ards the posterior 

 end. 



Species 10. (Mus. Brit.) 



GasieoCII.SNA IM.^INAIA. Ga^. trsid .-idn-uinpressd, l<.i- 

 t„„sd, uhl,.„,jd, riudeniud, f„s,;; ;„di,td: latere 

 ""f '"''■ ""d.,u,.-, j.rud„ct„, i.nre trmuna.a 



it„: hndu ,.a 



d te 



iiuunia pi 



Mie, 



e.r/,'„s„; latere /inslien tn,,.„i,,, a,i,,i,lnto, untenu. 

 <juhau depress,,: ared pn..f,ed rlmild, e„„t„l.,i. 

 'latd, prafiuule r/njafd ; „d l.rmnuna late I,::,,- 

 eatd; arm dvrsul, laid, e.rpa.isd : Injamenlr 

 vuojno, I, reel. 

 The kostkated Gastroch.ena. Shell rather com- 

 pressed, tortuous, oblong, covered with a brown 

 epidermis ; anterior side produced in front of 

 the umbones, wrinkled near the end ; hiatus vei-y 



