the Genus Planaxis. 41 



intus 7- albido-denticulatum ; columella modice arcuata, basi ex- 

 pansa, rimam parvam fere tegens, callo postico parvo, cum labro 

 canalem indistinctum formans. 

 Long. 10| mill., diam. 5. 



Hah. ? 



This is a very solid, small species, with the whorls trans- 

 versely striated ; the strife at the base of the body-whorl are 

 much deeper than those encircling the rest of the shell, and 

 produce the appearance of spiral ribs. The first stria below 

 the sutural line is rather distant from it, thus giving the whorls 

 the aspect of having an infrasutural raised belt. 



15. Planaxis Hartley i. 



P. testa elongato-ovata, omnino brunnea ; spira convexo-conica ; 

 anfr. 7, parum convex!, primi 3-4 politi, caeteri leviter spiraliter 

 anguste siilcati, incrementi lineis obliquis ornati ; anfr. ult. per- 

 magnus, basi sulcis validissimis ; apertura magna ; columella su- 

 perne callosa cum labro incisuram distinctam formans ; labrum 

 tenuiusculum, patulum, intus tenuiter liratum. 



Long. 12 mill., diam. 5|. Coll. S. Hanley. 



Var. Testa columellte callo postico producto cum labro incisuram, ut 

 in Pujpina, formante. Coll. S. Hanley. 



Hah. Sandwich Islands. 



I feel much pleasure in dedicating this species to Mr. Syl- 

 vanus Hanley, who has very kindly allowed me access to his 

 vast collection. 



It is much larger than P. atropurpureus^ P. niger^ or P. 

 abhreviatusj but belongs to the same group. 



Its principal characteristics are the strong basal sulcations 

 of the body -whorl, the well-marked posterior channel, and the 

 patulate outer lip. As is the case in several of the species of 

 the genus, the first stria below the suture is rather distant, 

 thus producing the appearance of an infrasutural raised belt. 



The loop-like sinus in the variety reminds one very much 

 of the incision in the genus Pupina. 



16. Planaxis similis. 



P. testa elongato-ovata, omnino brunnea, spira conica ; anfr. 7, 

 planiusculi ; primi 3-4 politi, caeteri valide spiraliter sulcati, 

 incrementi lineis obliquis ornati ; anfr. ultimi sulci 17 ad basim 

 paululum validiores ; apertura parva, angusta ; columella callo 

 postico parvo, cum labro incisuram parvam formante; labrum 

 crassum, baud dilatatum, intus 15-liratum. 



Long. 11| mill., diam. 5|. Coll. Sylvanus Hanley. 



Hah. Sandwich Islands. 



