45 
lato ; aperturd ovali ; labro tenui, acuto, intis levi ; canali mediocri. 
Axis 44 lin. 
Hab. Gulf of Papagayo, Central America. From eight to four- 
teen fathoms; mud. 
CuavaTuLa necurcta. Clav. testd fusiformi, gracili, fuscd ; an- 
fractibus nonis, costulatis, lineis elevatis decussatis ; costulis bre- 
vibus, rotundatis; suturd lined elevatd instructd, infra prope 
levigatd ; aperturd ovatd, obliqud ; sinu laterali pone suturam ; 
labro incrassato, inflexo ; canali mediocri. Axis 5 lin. 
Hab. Gulf of Nicoya, Central America. Under stones at low 
water. 
Cuavatuta rieipa. Clav. testd ovatd, retusd ; anfractibus quinis, 
costulatis, superné angulatis, transversim striatis; suturd sim- 
plici ; aperturd oblongd, labro crenulato ; columelld rugosd ; canali 
brevi. Axis 23 lin. 
Hab. Panama. 
Manee i, Leach. 
The shells of this group are distinguished by their small size, oval 
and attenuated shape, long linear mouth, terminated in a short canal, 
very slightly recurved ; outer lip nearly straight, the immediate mar- 
gin acute, but strengthened by the last-formed rib ; above shouldered, 
with a slight emargination, which does not admit of being called a 
sinus, and with the margin not callous; apparently not formed be- 
fore the full development of the shell; inner lip slightly produced ; 
suture always simple; last whorl not at all inflated, and occupying 
one-half or more of the entire length; sculpture consisting of longi- 
tudinal fold-like ribs, terminating at the suture ; very probably with- 
out an operculum, as Philippi observes that the animal of Pleurotoma 
Bertrandi, which belongs to this genus, is not provided with one. 
Restricted in this manner, a number of shells may be separated with 
advantage from the now bulky and somewhat incongruous genus 
Pleurotoma; and in this discrimination I have kept in view the 
Mangelia Goodalii of Leach, but have been by no means guided by 
the genus, as adopted by Risso. 
Manecenra cinnaMomeEa. Mang. testd attenuatd, nitidd, cinna- 
momed, albo fasciatd ; anfractibus senis, plico-costulatis, trans- 
versim levissim? striatis ; faucibus crenulatis. Axis 43 lin. 
Hab. North coast of New Guinea; Straits of Macassar ; Straits of 
Malacca. From five to twenty-two fathoms; mud. 
Mancexia coronata. Mang. testd attenuata, acuminatd ; anfrac- 
tibus senis, plico-costulatis, transversim striatis ; costulis superne 
subacuminatis ; faucibus levibus. Axis 4 lin. 
Hab. Straits of Macassar. 
Maneenra virrata. Mang. testd attenuatd, pallidd, fusco fasciatd ; 
anfractibus senis, plico-costulatis, transversim striatis ; costulis 
numerosis ; faucibus crenulatis. Axis 33 lin. 
Hab. Straits of Macassar. From ten fathoms; coarse sand. 
