GLANDINA. 81 



SUBORDER GEOPHILA. 



Eyes at the tips of elongated, cylindrical peduncles ; tentacles retrac- 

 tile or contractile, cylindrical, shorter than, and placed under, the eye- 

 peduncles, sometimes very small or wanting. Operculum never present 

 in the adult. Animal usually terrestrial. 



I do not propose any system of classification for the Pulmonata, but 

 the genera found within our limits may be grouped by the character of 

 their jaw and lingual dentition into 



A. Agnatha. Jaw absent ; marginal teeth aculeate or quadrate. 



B. Holognatha Vitrinea. Jaw in one piece ; marginal teeth aculeate. 



C. Holognatha Helicea. Jaw in one piece ; marginal teeth quadrate. 



D. Goniognatha. Jaw in separate pieces, the upper median one usually trian- 



gular ; marginal teeth quadrate. 



E. Elasmognatha. Jaw with an accessory upper piece; marginal teeth 



quadrate. 



This grouping, as is the case with any founded on one or two sepa- 

 rate characters, unites many genera otherwise widely separated, and as 

 widely separates some quite as intimately connected by other, per- 

 haps more important, characters. It seems to me, however, that these 

 distinctions may be, in the present state of our knowledge, considered 

 of family value, quite as well as those founded on the mantle, shell, or 

 other character. The names Testacellidce, Vitrinidoe, Helicidoe, Orthali- 

 cidoe, Succinidce, have also been used for the same divisions. 



A. AGNATHA. 



Jaw absent ; marginal teeth aculeate or quadrate. 



Of this division or family we have within our limits only the go.nus Glan 

 dina. Many other and varying genera, heliciform and limaciform, have been 

 described from other fauna. 



GLANDINA, SCHUM. 



Shell oblong, fusiform, horn-colored ; whorls 6-8, the last attenuated at base. 

 Aperture narrow, elliptically oblong ; peristome simple ; columella twisted for- 

 ward at the base and truncated. Suture often crcnulated or margined. Uni- 

 form in color, or ornamented with longitudinal, usually brownish streaks. 



Animal heliciform (see Vol. III. PI. LIX.), elongated, narrowed anteriorly; 

 eye-peduncles long, having the eye-spots on the posterior face, behind the tips, 

 which are deflected ; tentacles half the length of the eye-peduncles, bulbous, 

 and somewhat deflected at tip ; on each side of the oral aperture is a retractile, 

 palpiform appendage, attenuated at tip, and more or less recurved, nearly as 

 long as the eye-peduncle, the bases separated by a fissure in front ; buccal 



VOL. IV. 6 



