233 



rate gcnerieally those in wliich the fissure is very obvious, iu the 

 labruin, under the name of HcUcina, from those of which the la- 

 brum is simple or nearly so ; and to the latter the name of Oli'jyrd 



ould be retained, under which name I described the animal, till 



hen entirely unknown. 



Glandina. — Shell subturriculated, oblong-suboval, somewhat 

 fragile, terrestrial, simple ; front of the shell gradually attenuated 



the base of the columella ; aperture unarmed, rather narrow, 

 nearly longitudinal ; labrum simple, a little undulated ; columella 

 incurved, truncated at base. 



Ohs. Conchologists differ much in the arrangement of this small 

 group of shells. Chemnitz refers them to Bulla, and Buccinum ; 

 Gmelin and Dillwyn to Bulla, Helix and Voluta, and the former 

 has even placed one specimen in Strombus ; Brugui^re to Biilimus ; 

 Blainville and Sowerby to Acliatina ; and Ferussac to a subgenus 

 of Helix. Montfort who, for the period in which he published, 

 formed genera with a profuse hand, was the first to separate thi,'^ 

 group from all others. He distinguished it by the name of Polj/- 

 pliemus, which we regret that we cannot adopt, inasmuch as it was 

 preoccupied by Muller for a genus of Crustaceous animals, and is 

 still in use. It is to Schumacher that we are indebted for the 

 present generic name, to which we are not aware of any objectioirr 

 With respect to the characters of the shell, there can be no doubt 

 that Glandina is very closely allied to Acliatina, and notwith- 

 standing the difference which really exists in the general'habit, in 

 the labrum a columella, it would coalesce with it, were it not that 

 the inhabitant possesses characters which cannot justify the imion. 

 Ferussac was aware of these distinctions, and after extracting 

 what we formerly published relative to the characters of the ani- 

 mal, he states, " Si cependant on les reconnoit dans toutes les 

 autres especes du groupe auquel elles appartiennent, ou devra en 

 faire un genre apart, ou I'aiguillette et quelques unes des especes 

 analogues, que nous y reunissons, entreront par I'influence des 

 rapports generaux de leur coquille," and " De toutes les especes 

 que nous reunissons dans les helix, aucunes, sans doute, n'offrent 

 des caracteres dissemblance aussi prononces." 



Having unfortunately mislaid a sketch of the animal, taken 



[* Am. Con. ii. — Ed.] 

 18 



