A K E R A . 



Genus AKERA, Miiller. 



Teiii: cnitvol/il/i, ovata vel sitbcyliiulraci'a, veiifricosa, cor- 

 nea, tenuis, resilieus ; spira truncala, anfractibiis din- 

 fiiiclk, canaliculatis, ullimo ad sviuram ah ■peitnltimo 

 disjunclo ; labium extermim medio et siiprii ainualim 

 jiroductiim ; operculum indium. 

 Slu'U convolute, ovate or subcylindrical, ventricose, liorny, 

 thin, elastic; spire truncated, with distinct cbannellcd 

 wiiorls, the last disjoined from the previous one at 

 the suture; outer lip sinuously produced at and 

 above the centre ; no operculum, 

 Tiie distinguishing character of the shells of this genus 

 is the separation of the outer lip at the suture and horny 

 elasticity of the general structure. The few species known 

 fre(|ueut localities as far apart as Greenland in the nortii, 

 and New Holland in the south. The typical species, //. 

 wliita, is found at Zanzibar and in the Philippines. 



Species 1. (Fig-, a, b, Mus. Brit.) 



.\keua sub.\NQUL.\TA. Ale. testa parvd, lenui, lacleo- 

 ritred, gluboso-subquadratd, veutricosd, brevi, Ireri- 

 gnld ; spird parvd, subacnminatd, brevi, suturd pro- 

 fandd; ultimo anfraciu supra et infra medium rulitn- 

 datiiii unijnlalo ,- upertiird atitice expansu, colnwelld 

 arciiiild, leinii ; labia exteriio supra medium siiiuali',/ 

 prod uc to. 



The subangular Akeea. Shell small, thin, glassy 

 white, nearly sq\iare, ventricose, short, smooth; spire 

 small, slightly acuminated, short, with a deep suture ; 

 last whorl roundly angular above and below the mid- 

 dle; aperture expanded in front; columella arched, 

 thin ; outer lip sinuously produced above the middle. 



MoLI.ee, ' liulex of Mollusca of Greenland,' p. 79. 



Hab. Greenland. 



A very small, white, subglobose shell of somewhat 



glassy texture. 



es 2. Mus. •? (copied.) 



Ak. testa subcyUndracea, recliuscidd 



,/iedio fusco iniiftnnntd; spird coidraclii, plaiiidatii, 

 iiiij'racta ultimo siipenw tumido; uperturd (inlice sub- 

 (juadndd, postice coii/ractd ; labia externa supra me- 

 dium paulo producto ; columella rectiuscnld, an<justd. 



The tumid Akera. Shell snbcylindrioal, rather straight, 

 with a single central band of brown ; spire con- 

 tracted, flat, with the last whorl tumid above ; jiper- 

 ture rather square in front, contracted behind, with 

 outer lip a little produced above the cintre ; eohi- 

 mella rather straight, narrow. 



A. Adams, Sowerby's Thesaurus Conchyliorum, Bulla, 

 sp. 37, plate cxxv. f. 169. 



Hab. Shores of New Zealand. 



The whorls of this shel 

 Akera solula and Ak. tcuui 



tumid tii; 



se ol 



(.Mus. MacAndn-w.) 



Aker. 



Hani>eyi. .//■. 

 iiiissime striata, ri 



pared, ■mboblujan, uijlatd 

 versus spiram altenvatd .■ spird an 

 i/ustd, plaiiulntu ; nperturd infra medium oblir/ue ex 

 pausd ; cohimelld paulo arcuatd. 



Hanley's Akera. Shell small, suboblii|uc, inflated 

 very finely striated, attenuated towards the spin- 

 spire narrow, ilat ; aperture obliquely expanded be 

 low the centre ; columella a little arched. 



A. Adams, Sowerby's Thesaurus f'onehylionim ; 15ulla 

 sp. 37. pi. cxxi. f. -iO. 



Hub. Zetland. Dredged b>' Mr. MacAnilrew. 



Aery small and more oblique than the preceding speeie.s 



Species 4. (Fig. ct,-t), Mus. Brit.) 



Akkra soluta. Ak. testa eylindraced, vent ricosd, ten ni- 

 ter striata; spird exserld, apice planulato, suturd pro- 

 funda, pluHuUild: labia e.cterno longe retrorsum dis- 

 jnncla,ad mediiiut slnmitim praducto; columella oalde 



