448 



PROFESSOR LANKESTER. 



Class. 



SOLECOCMORPHA 



Classes and Orders of the MOLLUSCA. 



Branch a. EUCEPHALA. 



Examples, 



I. Gastropoda < 



II. Cephalopoda - 



Order. 

 Grade a. Lipoglossa. 



Neomenia. 



Grade b. Echinoglossa. 



Grade a. AMPHOMCEA. 



- -r, , , 1 f Chiton. 

 1. Polyplacophora \^chitonellu8. 



Graded. COCHLIBES. 



, . , , Tj (^Patella. 



1. Autocochhdes 1^^,,,-^^^. 



- TVT . .. r Atlanta. 



2. Natantia . |p^,,,^,^,/,,^. 



3. Cryptocochlides -| J^^ 



. -r> 1 i. fZimax. 



4. Pulmonata . ^ r.- ^^„,. 



. Grade «. PTEROPODA. 



1. Thecosoma . |c-4,,-,, 



2. Gymnosoma . {pt;,^,^,,^^,.. 

 Graded. SIPHONOPODA. 



T ^ , 1 1 . [ Orthoceras. 



1. Tetrabranchia. j jy^^^;;^,, 



... Dibranohia . {f^^f- 



Bentalium. 



1. Phylactolaema 



III. Scaphopoda 



^mwc^ B. LIPOCEPHALA. 

 Branch a. Holobranchia. 

 Grade a. EctojiTOcta. 



[ Lophopui. 

 \Plumatella. 



I. Tentaculi- ^ Gvmuolffima . /^«^^^f^^^<^^^«- 



BRANCHIA ^ * * \Flustra. 



(Bryozoa) Grade b. Entoprocta. 



-r, T 11 • { Peclicellina. 



Pedicelhnea . < r 



X^Loxosoma. 



Branch b. Pterobranchia. 



Podostoma . Rhabdopleura. 



