., l.oTIS. 



tentacles as usual; mantle partially covering the shell, having an 

 appendage posteriorly on the right side. 



Sliell sigaretiform, fragile and pellucid, composed of al.out '2^ 

 whorls, the spire flat and near the right side, the apical whorl smooth. 

 Lower sin-face completely open, the margin of the last whorl mem- 

 liranous, not calcified, the colnmella ;i spiral lamina along the suture. 



.law long and low, composed of numerous narrow plaits, as in Dry- 

 m&us, Aiii/ihiliiilhita, etc. 



Kadula with the transverse rows of teeth arranged /// clicri-oii ; 

 centrals with long and narrow basal plate, and a gouge-shaped, Iri- 

 lolied cusp, situated far hack on the basal plate. Side teeth similar, 

 hut larger; somewhat asymmetrical, the median cusp of the liilobed 

 gouge much smaller than the side cusps. 



The shell of G&otis is like that of Peltella and Cryptostrakon ; the 

 ja\\ is similar to that of Peltellu, Amphtbulima and Dnjinans ; but 

 the radula has peculiar teeth, with some resemblance to those of the 

 ( >rtliiilirln(c and J'<>h/init<t, and as in those genera, correlated with 

 arboreal habits. The marginal teeth of Aini>liilnilinni, and e.-pciially 

 of the siibgenera 1'i'Uii nl<i and Rhodoity.r, are eon>id< rahly like the 

 teeth of d'ccotix, and show its che relationship with those groups. 



The character of the radula peremptorily forbids a union ol (,',,<>fis 

 with I'i'lti'llii or Cryptostrakon. AVhile there can be little doubt that 

 it is allied to Pi'llclln, Pellicula, A in /iliilniliiini and SlTHpulopsif,?f\WQ- 

 iallv the siiligenus I'liitijtucciiicu, the exact rehitionships of these 

 genera remain unknown, awaiting a comparison of their soft anatomy. 

 (.'tt.itis lives on the trunks and leaves of trees, especially banana-. 

 It is doubtless a vegetable eater. The species now known are all 

 from 1'orlo Rico. 



Sinn tli wort li has adopted the plan of measuring the altitude ob- 

 liquely, as when the shell is placed concave side do\\ n on a flat sur- 

 lacr. This is more properly called the i-mirt.i-ili/. 1 have followed 

 hi> ui'-ihod, as the altitude cannot readily or certainly be measured 

 in I lie ordinary way. 



The soli parts will doubtless give more sali.-fai-tory specific char- 

 acters than the sin 11>. though the species docrili,! >ofar are not 

 difficult to di>tingui>h. None of them 1 a\ e been figured hitherto. The 

 radula and jaw are known by .Mr. \V. ('. r,inne\'- re -.-arches, but 

 nothing is known of the rest of tin- anatomy. 



< , ,<,ti's i/,,ni-i//i'i de .Morgan (Mull. Sn<'. Xoiil.de Fiance, \, p. 388, 



