with Descriptions of X< "• > 



being Agnatha, in which the jaw is wanting. This method of 

 classification was subsequently further elaborated by Morch 

 {Journ. de Conch, v. 1805), who, referring to Schmidt's state- 

 ment, placed Cylindrella in Agnatha. 



Gray {Ann. & Mag. Nat. Hist.vi. 267, I860) suggested 

 a division of the Pulmonata GeophUa into two sections, viz.: 



Sect. I. Vekmivora. Buccal mass very large; < • 1 « > 1 1 l^: : i » < • , pro 

 jectile like a proboscis. Jaw none; teeth numerous, Blender, coni- 

 cal, distant. Mantle well defined. Subterraneous; carnivorous, or 

 worm-eating. 



Sect. II. Phyllovora. The buccal mass Bra all, ovoid, n«>t pro« 

 duced. Jaw distinct, horny; teeth numerous, four-sided, close 

 together on the lingual membrane. Herbivorous. 



In the first Section, which seems to be equivalent to Morch's 

 Agnatha, Gray placed the OleaoinidcB, Streptaxida and / 

 ceilidh, — in the second, Ilelicbhi. Arionida, etc., etc., — he 

 did not specially refer to Cylindrella. Albers and Von Mar 

 tens {Die Heliceen, 2 ed. 1861) have Cylindrella in Testacellea, 

 giving as generic characters, on the authority of Schmidt, 

 "Maxilla nulla. Dentes raduke in lineia utrinque "lilitjni- 

 dispositi, bini basi conjuncti." He adoptH Beveral Btibgenera, 

 one of which is Urocoptis Beck, comprising C. Ghi( sbn gkti Pfr. 

 and other large Mexican species, as well as the -mailer allied 

 forms of the West Indies. 



In November, 1865, I published (Ami. Tjyc. viii. L61 I the an- 

 nexed figure of the lingual dentition of C. 

 scceva 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 

 fringed." The expreasionjoinedtwobytioo 

 was inadvertently need, and Morse has 

 since called my attention to it, in fad each 

 plate (lateral) has two cusp-. 



Guppy {Ann. & Mag. Nat. Hist. Jannary, l- 





