P T E R C E R A. 



Spfcies 3. (Mus. Cuuuii^-.J 



Ptekocera scorpius. Pier, teatd ovato-oblongd, spira 

 breviusculd, apice acuta, anfractibus striis subtilibus 

 elevatis cingidatk, mperne plano-declivibus, ad angu- 

 lum actitis, compresse nodatis, anfractu ultimo costis 

 tuberom cinguluto, heptadadylo, daclrjUs nodatis, la- 

 teralibm brevibtis, c/i/rn/is, nulird rhmijato, curvalo, 

 columella et aperliir,/ J\iiii,- (Inr.r vt jnrlilrr corrugatis, 

 labro antice crenato ,■ nlhiiUi. ca^liiiiin-fmsco sparsim 

 maculatd, columella et apertura; fauce roseo-carneis, in- 

 tense violaceo tinctis, rugis albis. 



The scorpion Pterocera. Shell ovattly oblong, spire 

 rather short, apex shai-p, whorls encii-cled with fine 

 raised striee, flatly slanting round the upper part, 

 shai-p at the angle, compressly nodided, last whorl 

 encircled with tuberous ribs, seven-clawed, claws no- 

 dided, side claws short, curved, front claw long, 

 cun-ed, columella and iuterioi- of the apei-tiu-e densely 

 and strongly ^vi-iuklid, lip rrciiated in front; whitish, 

 sparingly blotched witli chestnut-brown, coliunella 

 and interior of the aperture pinkish-flesh, stained 

 with very deep violet, upon which the wrinkles are 

 white. 



Slrombus scorpius, Linnaeus, Syst. Nal . (12t!i edit. ) p. 1308. 

 Pterocera scorpio, Lamarck. 

 Pterocera nodosa, Swainsou. 

 Hah. Pliilippine Islands (on the reefs at low water); 

 Chiming. 



WcU cUstiugmshed by its shaqil 

 tcn^e xinlet coloming intemallv. 



iioduled claws, and 



Pterocera 

 spird b. 



cs 4. (ilu'i. Cuming.) 

 -SCI II! CIO. Pter. testa mato-oblotigd, 

 il, iijiice acuta, avfractihus striis sub- 

 tilibus eh'rriHx eiiigiildlis, snperne plano-decUvibus, ad 

 angidum acutis et compresse nodatis, anfractu ultimo 

 costis tuberosis ciugulato. heptadactrjlo, dactylis obso- 

 lete nodatis, lateralibus cnrvatis, duobus approximatis, 

 dactylo postico longinsculo, labro antice crenato, colu- 

 mella et aperturre fauce dense et fortiter corrugatis ; 

 albidd, castaneo-fusco marmoratd, columelld et aper- 

 tura' fauce intense fusco-purpureis, rugis albis. 

 The false-scorpion Pterocera. Shell ovately oblong, 

 spire rather short, sharp at the apex, whorls encircled 

 «ith fine raised strife, flatly slanting romid the upper 

 part, shaq) and compressly noduled at the angle, last 

 whorl encircled with tuberous ribs, seven-clawed, 

 claws obsoletely noduled, side claws cmwed, the two 

 uppeimost of the side claws approximating each other, 

 posterior claw rather long, lip crenated in fi-ont, colu- 

 mella and interior of the aperture densely and strongly 

 wrinkled; whitish, marbled with chestnut-brown, 

 columella and luteridr of the aperture deep bromiish- 

 purple, wrinkles white. 

 Lamarck, Anim.saus verLCDcsliayes' eilit.) vol.ix. p. 674. 

 Ilab. Zanzibar. East .\trira. 



It is extrcmrly dniilitl'id whether this is anjihing more 

 than a local vavii-ty of tiie foregoing species. It is uni- 

 foi-mly of larger size, with the claws more prolonged and 

 less nodided. The hinder claw is especially elongated, 

 and the two hinder side-chnvs are approximated both in 

 Mr. Cuming's specimen and that in the British Museum. 



Pebruary, 1851. 



