and on some new species 0/ MargineTla. 357: . 



minime pi'ofundo ; extremitatibns planis, prominentioribiis, cai'i- 

 natis, posteriori non rostrato ; canali profundo, breviusculo. ■_AA 



Long. j%, lat. j-y^ poll. 



Hab. ad insulam Sancti Vincentii. Mus. Gaskoin. 



Shell subcylindrico-ovate, opake-white colour, three conti- 

 nuous bands a few shades darker than the shell traverse the 

 dorsum ; dorsum coarsely striated longitudinally ; spire rather 

 depressed, subacuminated, volutions four, irregularly crenulated ; 

 the posterior edge of the last whorl forms a coronated ridge at 

 the base, of which a deep depression surrounds the shell termi-^ 

 nating at the outer part of the aperture ; base rather round, 

 broad and very thick, abrupt at its outer border, and extends 

 over the anterior third of the side of the shell terminating on the 

 columellar extremity ; aperture rather narrow, slightly curved ; 

 outer lip thick and finely denticulated along the inner edge ; 

 columellar side, about twelve or fourteen distant linear teeth tra- 

 verse the entire base and terminate on the inner margin of the 

 columellar groove; columellar groove shallow; exti*emities flat 

 (peqiendicularly), rather prominent and keeled, posterior end of 

 aperture not rostrated ; channel deep and rather short. 



Long y^if'u, wide yjj^ of an inch. 



Hab. Island of St. Vincent. Cab. Gaskoin. 



Plate XII. figs. 1, 2, 3, thrice liat. size. 



Pachybathron marginelloideum. 



Testa subcylindrica, alba opaca, fascia brunnea spirani ple- 

 ramque circumdante, fasciis tribus (quatuor ?) lineis fulvis sa- 

 gittseformibus intcrruptis cincta; dorso longitudinaliter leviter 

 striato, sulcis remotis profundioribus parallelis excavatis im- 

 pressoj spii-a plana, depi-essa (juniorum apice prominulo, ob- 

 tuso), anfractibus 3-4, plus minusve crenulatis ; basi rotundius- 

 cula, lata, crassissima, ad marginem exteriorem abrupte latitu- 

 dine decrescente et ad dorsum canalis desinente ; apertura an- 

 gustiuscula, parum arcuata, postice non rostrata ; labro crasso, 

 per totum marginem interiorem denticulato, latere columellari 

 denticulis 12-13 fortibus remotiusculis linearibus a margine per 

 basin usqiie ad marginem interiorem sulci columellaris extensis 

 munito; sulco columellari lato, minime profundo; extremitatibus 

 obtusis, crassis ; canali brevi. 



Long. -i%8_ lat. -iJL poll. 



Hab. in India Occidentali. Mus. Gaskoin. 



Shell subcylindrical, opake-white colour, a brown marking 

 encircles the spire, and three (four ?) reddish brown interrupted 

 arrow-shaped bands traverse the shell ; dorsiim finely striated 

 longitudinally, impressed with rather deep and distant parallel 



