22 



Variat tesld parvd longiore, costis decussantibus omnibus lamdlife- 



ris : long. 08, lat. 04, alt. 07 poli. 

 Hab. ad Acapulco. — G. B. S. 



Venus undatella. Ven. testd rotundato-ellipticd, crassd, albidd 

 fusco maculatd punctatd et undatim pictd, costellis radiantihus 

 confertis, aliisąue decussantibus undulatis siiblamellosis ; latere 

 antico breviore, postico subdeclivi, marginibus depressis ; margine 

 ventrali rotundato, intus crenulato : long. 1"6, lat. I", alt. lo 

 poli. 



Hab. in Sinu Califomiensi. (Island of Tres Marias.) 



Found on the shore. — G. B. S. 



Ventis discrepaxs. Ven. testd ellipticd, crassd, albicante, fusco 

 subradiatim pictd ; latere antico breviore, subproducto ; postico 

 subdeclivi ; marginibus depressis ; costis concentricis postice lamel- 

 losis, medio obtusis, laliusculis, antice sitblamellosis ; umbonibus 

 subprominentibus ; margine ventrali rotundato, inttis denticulato : 

 long. 1-4, lat. 0-8, alt. 1-25 poli. 



Hab. ad oras Peruviae. (Islay.) 



The blunt, rather broad, concentric ribs of the middle part of each 

 valvc are speckled with bro\vn on their upper surfaces, and delicately 

 crenulated on their ventral margins. 



Found in muddy sand at a depth of sixteen fathoms. — G. B. S. 



Venus multicostata. Ven. testd ellipticd, ventricosd, crassd, con- 

 centrice multicostatd, costis reflexis, crassis, antice undulatis, me- 

 dio crenatis, postid alternatim interruptis, subirregularibus, sub- 

 undulatis; marginibus dorsali rectiuscutb, ventrali rotundato ; itn- 

 pressione cordįformi anticd distinctd : long. 4"3, lat. 2'7, alt. 3"7 

 poli. 



Hab. in Sinu Panamae. 



This is perhaps the largest species known. It is a very handsome 

 shell, of a pale fawn colour, ■vvith several darker rays, somewhat 

 divided into spots. 



Found in coarse sand at low water. — G. B. S. 



Venus Peiiuviaxa. Ven. testd obovatd, a'assd, concentrice costatd, 

 costis crassiusculis, sublamellosis, antice rejlexis, medio reflexis, 

 fulvo articulatis, postice deflexis, tenuioribus ; latere postico ąiiam 

 anticum duplu longiore, marginibus depressis, planatis ; margine 

 ventrali rotundato, intUs l<Bvi : long. 23, lat. 12, alt. 19 poli. 



Hab. ad oras Peruvise. (Ancon.) 



Found in soft mud at a depth of five fathoms. — G. B. S. 



Venus Australis. Ven. testd ovato-subtrigond, crassiusculd, ful- 

 vcscente maculis angulosis subtrigonis subradiatim pictd, concen- 

 trice lamellosd, lamellis concinnis confertis, tenuibus, obtusis, pul- 

 cherrime radiatim decussatis, prope latera elevatioribus ; margi- 

 nibus dorsali subelcvato, ventrali rotundato, intus denticulato : 

 long. 11, lat. Oo5, alt. 0-9 poli. 



Hab. ad oras Australite. (Swan River.) — G. B. S. 



