Figure Hft. — Magellania Wi/rillii Davidson. 



FiGUUK lid. — Magellintid Jldcescens Lamarck. 



Figure lie. — Magellania kerguelenensis Davidson. 



Figures E/>, ¥b, ijb, lie. — Ontogeny of Magellania (Neothgris) len- 

 ticidaris Desliayes, from the magadifurm to the magellaniform stages. 



Figures Ec, Fc, Gc. — The viagadi/onn, magaselliform^ and terebratelli- 

 form stages of Terebratella cruenlu Dillwyu. 



Figures E(/, Vd, (id. — The same stages in Terebratella rubicunda 

 G. B. Sowerby. 



Figure E. — Magas pumilus Sowerby; the Cretaceous prototype of 

 tliis structure. 



Figures Vj/, ¥e. — Tlie magailifonn and magaseUifonn stages of Mag- 

 asella Cumingi Davidson. 



Figure Y)b. — Megerlina Lamarckiana Davidson; adult form of 

 brachial supports. 



Fkjure Cft. — Kraussina rubra Pallas; adult; showing sejitum and 

 two branches. 



Figure Cc. — Kraussina pisnm Valenciennes apud Lamarck. 



Figure (Jd. — Boucliardia roxea Mawe; adult; showing thickened 

 cardinal process, hinge-plate, and ring on the septum as in Ca. 



