On new f>pecies of MolluHca. 4.^9 



towards the north the .size diminishes. The maxiniiun ot" 

 otie ^Toup, hitwever, surpasses tlic miiiiniiun of another 

 group. When such is the case, the variation in size seems 

 also to forn) a continuous series, which. I am sure, will |)rove 

 still more continuous when further material is obtained. 



Althou^ih the (listin<,Miishini,' characteristics doriveij from 

 size also jirc thus rendered unimportant, the variation of the 

 weasel certainly does not lack sii^niticancc, l)ecause inter- 

 mediate sta<res occur which unite the extreme forms. 



LIX. — New Species of MoUttsca of t/ie Genera Voluta, Conus, 

 Siphonalia, and Eutliria. By G. B. SoWEtiBV, F.L.S. 



[Plate XI.] 

 The types are in the British Museum (Natural History). 



1. Voluta nnipHcata, sp. n. (PI. XI. fiff. 1.) 



Testa fusiformis, tenuis, pallida, utrinque acuminata, iu medio con- 

 vexa ; spira pyramidata, mediocriter louga ; sutura anguste 

 canaliculuta ; anfractus (5-0?), supra broviter concavo-depressi, 

 deinde convexi, undi<pie longitudinaliter ftlo-striati, spiraliter 

 dense decussatim striati, plicis longitudinalibus numcrosis, in 

 ultimo subobsoletis instructi ; anfractus ultimus oblongus spiram 

 multo supcraiis, supra obtusissime angulatus, supra angulum sub- 

 planato declivis, infra convexus, basim versus attenuatus ; aper- 

 tura ampla, fauce nitens, rufo-carnea ; labrum tcnucvix redexum ; 

 columella tenuis, plica unica alba lentissime contorta instructa ; 

 area polita columellari late etfusa, rufo-auraatia. 



Ix)ng. (circ.) 200, maj. diam. 82 mm. 



Hah. Japan. 



I liave seen only one shell of this remarkable species ; the 

 apex is unfortumitely broken off, so that the descri|)tiou is 

 necessarily incomplete, althouj^h the shell is otherwise iu 

 |)erfect condition. It is of a light structure, scul|jtured with 

 dose spiral stria?, which are more i)romincnt on the upper 

 part of the whorls ; the whorls of the spire arc closely and 

 regularly longitudinally plicate, but the pliciB become irre- 

 ;;ular and almost obsolete on the body-whorl. The wlule 

 interior, including the lip, is lustrous pinkish red, ami a thin 

 shining enamel of orange-red covering the columella is spread 

 half across liie whorl. The columella is furnished with a 

 single well-defined plait, which is lung, narrow, and but 



