Zoological Society. 145 



Mangelia, 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. 



Mangelia cinnamomea. Many, testa atienuatd, nitidd, cinna- 

 momed, albo fasciatd ; anfractibus senis, plico-costulatis, trans- 

 versim Icevissime striatis ; faucibus crenulalis. Axis 4^ lin. 



Hab. North coast of New Guinea ; Straits of Macassar ; Straits of 

 Malacca. From five to twenty-two fathoms ; mud. 



Mangelia coronata. Mang. testd attenuatd, acuminatd ; anfrac- 

 tibus senis, plico-costulatis, transversim striatis ; costulis superne 

 subacuminatis ; faucibus laevibus. Axis 4 lin. 



Hab. Straits of Macassar. 



Mangelia vittata. Mang. testd attenuatd, pallidiUf'usco fasciatd; 



anfractibus senis, plico-costulatis, transversim striatis ; costulis 



numerosis ; faucibus crenulatis. Axis 3^ lin. 

 Hab. Straits of Macassar. From ten fathoms ; coarse sand. 



Mangelia oriza. Mang. testd attenuatd, acuminatd, laevigata, 

 nitidd, hexagone plico-costulatd ; anfractibus sept enis ; faucibus 

 Icevibus, Axis 4^ lin. 



Hab. North coast of New Guinea. From twenty- two fathoms ; 

 mud. 



Mangelia celebensis. Mang. testd attenuatd, Icevigatd, pallidd, 

 fusco late fasciatd ; anfractibus senis, plico-costulatis ; costulis 

 subdi stantibus ; faucibus crenulatis. Axis 3^ lin. 



Hab. Straits of Macassar. From ten fathoms ; mud. 



Mr. Reeve then communicated his description of a new species of 

 Cyclostoma, from the Cordilleras Mountains. 



Cyclostoma stramineum. Cycl. testd orbiculari, subdepressd, 

 stramineo -luted, spird versus apicem rosacea; usquequaque ele- 

 gantissime striatd, striis, ab umbilico exorientibus , diagonaliter 

 collocatis ; aperturdfere circulari, superne subsinuatd, peritremate 

 simplici ; operculo testaceo, albo, multi-spirali. 

 Ann, ^ Mag, iV. Hist. Vol xiii. L 



