Zoological Society. 431 



Leptopus. 



Rostrum longum, tenue, rectum ; nares basales ; alae mediocres ; pri- 



marise tres ievh sequales, secunda longissima ; cauda subrotundata ; 



tarsi mediocres ; digiti longi et tenues ; nuUus 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 Mitchellii. Lep. capite fuscescente lined alhd circa 

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

 reis metallicis coloribus ornato ; fascid albd apud pectus ; suhtiis 

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

 fiavis. 

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

 medio, 1 poll. 

 Hab. 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. testd rotundato-cordatd, crassd, solidd, in- 

 cequilaterali, tumidd,subnitidd, concentrice et subimbricatim sulcatd; 

 epidermide olivaceo-fuscescente, et marginem convexum aut sub- 

 arcuatum versus, luteo-virescente radiisque nigrescentibus ornatd ; 

 margine dorsali postico declivi, convexiusculo ; lunuld nulld ; nati- 

 bus acutis, incurvatis, integris ; ligamento parum prominente ; su- 

 perficie interna purpured ; dentibus lateralibus distinctis, brevibus, 

 minutissime rugulosis (Jiaud crenatis autem), antico approximato. 



Long. 150; lat. 1'70 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 sub orbicular i, crassd, subincequilate- 

 rali, ventricosd aut tumidd; epidermide olivaceo-fuscescente et 

 marginem ventralem convexum versus, luteo-virescente, concentrice 

 rugulosd ; margine dorsali postico, convexiusculo, declivi; natibus 

 erosis, satis prominentibus ; ligamento subinfosso ; lunuld nulld; 

 superficie internd albidd; dentibus lateralibus brevibus obtusis, 

 antico magis approximate . 



Index Test. Sup. t. 14. f. 51 . Long. 1-50; lat. 1-60 poll. 



Hab. North America. Mus. Hanley. 



