PLACUNANOMIA. 



Species 10. (Fig. a, b, Mus. Cuming.) 

 I'l.^cunanomia Gouldi. Plac. testa mUrhjono-ovala, 

 radiatim minute sqiMmato-driatd, striis muriealo-isqna- 

 matis ; sordicle alba, intus lutescerde-funrd. 

 Gould's PLACUNANOsirA. Shell somewhat triangularly 

 ovate, radiately minutely scale-stviated, strife prickly- 

 scaled ; dead-white, interior yellowish-brown. 



Hab. ? 



A small species, not referable to any hitherto described, 

 for which Mr. Cuming is indebted to Dr. Gould, of Bos- 

 ton, United States. 



Species 11. (Fig. a, h, Mus. Cuming.) 

 I'l.ACUNANOMFA ALOPK. Plac. testd orbiculari, apice vix 



niarginali, valvd superiori plana, radiatim corruyato- 



roUald, cudia subundatis ; virencente-albd. 

 The fox 1'lacunanomia. Shell orbicular, apex scarcely 



marginal, upper valve flat, radiately wrinkle-ribbed, 



ribs waved ; greenish-white. 

 Gray, Pro. Zool. Soc. 1849, p. 122. 

 Hab. California. 



In this species the ribs have an irregular character, dis- 

 posed in waved radiating wrinkles. 



Species 13. (Fig. a, b, Mus. Cuming.) 

 Pxaccnanomia CEPlo. Plac. testa orbiculari, radiatim 



minute striata, uudique rtigoso-malleatd ; pellucido- 



albd; perforatione sabampld. 

 The crystal Placunanomia. Shell orbicular, radi- 



ately minutely striated, everywhere wrinkle-indenicd ; 



transparent-white ; orifice rather large. 

 Gray, Pro. Zool. Soc. 1849, p. 121. 

 Hab. California. 



A very delicate transparent species, curiously wrinkled 

 and nwdleated throughout. 



Species 13. (Fig. a, b, Mus. Cuming.) 



Placunanomia Australica. Plac. testa transverse. ova- 

 Id, radiatim tenuiliratd, liris minute muricato-sqimmu- 

 tis ; pellmido-albd, intus cceruleo-virente. 



The Australian Placunanomia. Shell transversely 

 ovate, radiately finely ridged, ridges minutely prickly- 

 scaled ; transparent-white, ifiterior blue-green. 



Hab. Australia. 



Finely sculptured throughout with minutely scaled 



ridges. 



Species 14. (Fig. a, b, Mus. Cuming.) 



Placunanomia abnormalis. Plac. testa orbiculari, 

 radiatim divaricato-liratd, liris promisctte nndutis, 

 minute squamatis ; -mrdide albd, int/is virescente. 



The abnormal Pl.\cunanomia. Shell orbicular, radi- 

 ately divaricately ridged, ridges promiscuously waved, 

 minutely scaled ; dead-white, interior greenish. 



Gray, Pro. Zool. Soc. 1849, p. 121. 



Hab. West Indies. 



The radiating ridges of this species have a ppculi;u 



promiscuously wrinkled character. 



