new Species of 'Pleuvotom'idsc. 49a 



The spiral lirations in this species are particularly promi- 

 nent, cs])cc'ially upon the ribs, where in the Lody-whorl they 

 are developed into little nodules. 



Pleurotoma {Drillia) variahilis. 



Testa clavatc fusiformis, subrimata, fusco-lutca, rubro-fusco notata 

 praicipue infra suturani ; aiifract. 12, supra concari, medio ani^u- 

 lati, infra cxcavationcm costis subtubcrcularibus inferne versus 

 suturas fore obsolctis (in anfr. ult. 10 baud ad basim attingenti- 

 bus) instructi, liris spiralibus 3-4 (in anfr. ultimo circitcr 15 

 subgraTiosis) liueisque aliis tenuibus cincti ; anfract. ultimus sub- 

 quadratiis, basi modo paululum constrictus ; apertura intus laevis 

 paUide rosacea, longitudinis totius * ada;quans, callo supemo 

 tubercidoso itiduta ; canalis brevissimus, reciu-vus ; sinus latus 

 profundi usculus ; labriim extra iucrassatum. 



Long. 34 mill., diam. 10. 



Var. Testa alba, fusco sparse pimctata. 



Hah. ? 



This species is remarkable for the squarish body-whorl and 



the very sliort canal and aperture. The lirations, where they 



traverse the plications, are whitisli. 



Pleurotoma [Drillia) Athinsonii. 



Testa ovato-fusiformis, flavescens, ad apicem fusca, inter costas 

 rosco-fusco maculata ; anfract. 11, convexi, supcrne paululum 

 excavati, superne adsuturani oblique crenulati, costis rotundatis, 

 supra fere obsoletis (in anfr. ultimo <S-9 basi dcsinentibus) in- 

 structi, liris validis supra costas leviter incrassatis (in anfr. 

 superioribus G-7, in ultimo circitcr 10) succincti, uudique inere- 

 menti lineis obbijuis ornati ; apertura intus saturate f\isca, lon- 

 gitudinis totius ^r^ aequaus ; labrum extra costa ultima maxima 

 incrassatum, intus roseo-album ; columella livido-fusca, callo 

 tenui amicta, supra tuberculo parvo munita ; sinus mediocris ; 

 canalis brevis, reeurvus, aurantiaco-fusco tinctus. 



Long. 2G mill., diam. 8. 



Hah. ? 



The lines of growth in this species are particularly aj)parent. 

 The ribs on the body-whorl are slightly nodose at their lower 

 part, where the spiral lirations cross them. 



Pleurotoma [Di-ilUa) angusta. 

 Testa angusta, elongata, fusiformis, dilute lutco-fusca, apice cau- 

 daque alba (intcrdum omnino alba) ; anfract. i», apicales magni, 

 rotundati, carter! convexi, infra suturam leviter concavi, costis 

 confertis tuberculosis obli(piis superne suturas vix attingentibus 

 (in anfr. ultimo lo, paululum infra peripberiam desinentil)us) 

 instructi, sukis s])iralibus (in anfr. .superioribus ;j-(!, in ultimo 

 ( ircitcr IG) insculpti ; apertura i»arva, longitudinis testic \ ad- 



