13 
spirally passing on the whorls to be.lost in the deeper colour of the 
apicine volutions ; spire acuminated, about half the length of the 
shell; volutions seven, convex; aperture wide, subquadrangular ; 
outer lip rather thin, denticulated within on its whole extent ; inner 
hp slightly denticulated along its rather angular inner edge; fine 
strize traverse the anterior part of the dorsum; peritreme of a dark 
purple-brown colour ; channel very short. 
Length, ;4°, of an inch ; width, 2° of an inch. 
Hab. Sandeago, California. Cab. Cuming, Gaskoin. 
20. CorumpeLta Iopostoma. Testa oblongo-ovata, irregula- HOLCOTYEE * 
riter brunnea; spird acuminatd, apice ceruleo-brunneo; an- \274.\2 \\ \\2 
Jractibus septem vel octo raptim longitudinaliter decrescen- 2 sae 
tibus ; costellis prope aperturam minus prominentibus, costis 
ad posticum marginem in tuberculis postice terminantibus ; 
aperturd posticé latiusculd, antice subacutd; labio externo 
tenui, intus denticulato ; labio interno intus denticulato, varice 
prominente marginato ; dorso anticé extus striato; canali lon- 
giusculo ; margine peritrematis purpureo-brunnescente. 
Shell oblong-ovate, of an irregular brown colour ; spire acumina- 
ted, apex dark bluish brown colour ; volutions seven to eight, greatly 
decreasing in circumference on to the apex, strongly ribbed longitu- 
dinally, less strongly towards the aperture, the ribs terminating in 
colourless nodules at the posterior edge of the volutions; aperture 
rather broad posteriorly, subacute anteriorly ; outer lip thin, denticu- 
lated to its full extent within ; inner lip denticulated within, bordered 
by a rather prominent varix, from the outside of which strie pass 
over the dorsum of the channel; channel rather long and broad ; 
edge of peritreme of a dark purplish brown colour. 
Length, 5°, of an inch; width, 22. of an inch. 
Hab. Port Essington. Cab. (specimen. unicum) Gaskoin. 
Cyprma Crara. Testa subcylindraceo-ovalis, rufescenti-cinerea, 
anticé et posticé supra extremitate maculd brunned ornata ; fas- 
ciis latis saturatioribus tribus ; basi marginibusque albescenti- 
bus ; aperturd latiusculd subspirali ; labio externo crassiusculo, 
dentibus circa viginti-sex, regularibus, prominentibus ; interno 
subspirali, dentibus circa viginti; sulco columellari profundo 
latoque, intus denticulato ; marginibus rotundatis, incrassatis ; 
extremitatibus obtusis, punctis minutissimis nigris notatis. 
Shell subcylindrical-ovate, of a lightish red-ash colour, with three 
broad bands placed about the anterior and posterior thirds and middle 
of the shell, the middle one being narrowest, the lighter colour of the 
shell being observed between them; a rather large reddish-brown 
marking over the anterior and posterior extremities, gradually fading 
along the margins ; base whitish in a degree tinted with pink, round ; 
the calcareous deposit forming the denticulations extends on to the 
sides of the shell; aperture moderately wide, subspiral; outer lip 
thick, with about twenty-six regular, even, rather prominent teeth 
occupying the entire thick edge of the lip but not extending on to 
