Zoological Society. 431 



Leptopus. 



Rostrum longura, tenue, rectum ; narcs basales ; alse mediocres ; pri- 



maria' tres fere aequales, secunda longissima ; Cauda subrotundata ; 



tarsi mediocres ; digiti longi et teiiues ; nullus digitus posterior ; 



ptilosis junioris seniori dissimilis. 



The bill of this bird is of the same formation as that of Totanus 

 chloropygius, Vieill., while the feet resemble those of Hiaticula tri- 

 collaris. 



Leptopus Mitciiellii. Lep. capite fuscescente lined albd circa 

 verticem ; collo ferrugineo ; corpore superne cinereo-fusco purpu- 

 reis metallicis coloribus ornato ; fascid albd apud pectus ; subtus 

 fasciis parvis albis et nigris alternis ; rostra saturate viridi ; tarsis 

 flavis. 

 Tot. long. 7 ; alee, 4^ ; cauda, 2^ ; rostrum, 1 ; tarsi, | ; digito 

 medio, 1 poll. 

 Hub. Chile. 



Another specimen, which I take to be the young of the above, has 

 an undefined white line passing from eye to eye round the back of 

 the head, the whole upper surface barred and mottled irregularly 

 with ferruginous and blackish brown ; cheeks and throat mottled 

 with soot-colour, barred on the breast in a similar manner to the 

 adult, which barring is almost lost on the belly ; vent and thighs 

 white. 



October 22. — Professor Owen, V.P., in the Chair. 



A paper by Sylvanus Hanley, Esq., was read, containing descrip- 

 tions of new species of Cyrena, Venus, and Amphidesma. 



Cyrena radiata. Cyr. testdrotundato-cordatd, C7'assd, solidd, in- 

 (Equdaterali, tianidd,subnitidd, concentrice et subimbricatim sulcatd; 

 epidermide oUvaceo-fuscescente, et viarginem convexurn uut siib- 

 arcuatum versus, luteo-virescente 7-adiisque nigrescentibus ornatd ; 

 marginc dorsali postico declivi, convexiusculo ; lunuld nulla; nati- 

 bus acutis, incurvatis, integris ; lig anient o parum prominente ; su- 

 perficie interna purpured ; dentibus lateralibus distinctis, brevibus, 

 minutissiyne rugulosis (baud crenatis auteni), antico approximato. 



Long. 150; lat. 170 poll. 



Hab. Central America. Mus. Hanley, Cuming, Sowerby. 



This and the variegata of D'Orbigny are remarkable for being the 

 only radiated Cyrena at present known to us. The latter species is 

 decidedly depressed, whilst the radiata is peculiarly swollen. 



Cyrena sordida. Cyr. testd suborbiculari, crassd, subinceqvilate- 

 rali, ventricosd aut tumidd ; epidermide olivaceo-fuscescente et 

 marginem ventralem convexurn versus, luteo-virescente, concentrice 

 rugulosd ; margine dorsali postico, convexiusculo, declivi; natibus 

 erosis, satis prominent ibus ; ligamento subinfosso ; lunuld nulla; 

 superficie interna albidd ; dentibus lateralibus brevibus obtusis, 

 antico magis upproximato. 



Index Test. Sup. t. 14. f. 51. Long. 1-50; lat. I'GO poll. 



Hab. North America. Mus. Hanley. 



