2 Notes on certain Terrestrial Ifollusca, 



lu the first Section, wliicli seems to be equivalent to Mdrcli's 

 Agnatha, Gray placed tlie Oleaci7iidcB, StreptaxicU and Testa- 

 celUdce,—m the second, HelicidcB, ArionidcB, etc., etc.,— he 

 did not specially refer to Cylindrella. Albers and Yon Mar- 

 tens (Die Heliceeuy 2 ed. 1861) have Cylindrella in Testacellea^ 

 giving as generic characters, on the authority of Schmidt, 

 "Maxilla nulla. Dentes radulse in lineis utrinque obliqnis 

 dispositi, bini basi conjnncti." He adopts several subgenera, 

 one of which is Urocoptis Beck, comprising C. Ghiesbreghti Pfr. 

 and other large Mexican species, as well as the smaller allied 

 forms of the West Indies. 



In 'JSTovembcr, 1865, I published (Ann. Lye. viii. 161) the an- 

 nexed figure of the lingual dentition of C- 

 sccGva Gund. of Cuba, with the remark 

 " the rows of teeth are about 130 in num- 

 ber, the formula being 26-2-26. The cen- 

 tral plate is small, obtusely pointed, laterals 

 uncinated, joined two by two, upper edge 

 fi-i nged.-' The expression joined two hy tide 

 Lin^niai Dentition ,.f WHS inad vcrtcutly uscd, and Morse has 



Cylindrella sca>vn, GuncL ^j^^^^ ^^^|j^^^ ^^^^ attCUtioU tO it, iu fact eack 



plate (lateral) has two cusps. 



Guppy {Ann. c5 3£ag. JSTat. Hist January, 1866) thus de- 

 scribed the animal and teeth of C. TrinitariaVh'. of Trinidad : 



"The animal is ashy gray, becoming nearly black about the head 

 and tentacles. Foot elongate, narrow ; tentacles (4) slender. Lin- 

 gual ribbon very long and narrow ; teeth 3-1-3 ; medians narrow 

 bicuspid, with two tubercles on the base ; first and second laterals 

 with simple round cusps, outer lateral inconspicuous, rather claw- 

 shaped." 



Mcirch has since observed {Jour, de Conch, vii. 257, 1867) 

 that my figure of C. sccBva appears to confirm the accuracy of 

 the observation of Schmidt and of Guppy 's description. I agree, 

 however^ with Crosse and Fischer {Jour, de Conch, vi. 223, 

 1 866), that the similarity of structure of the lingual armature in 



