564 , SCIENTIFIC RECORD FOR 1884. 



a ne u variety of Ainygdalocystites florealis as var. Icevis. The illustra 

 tious are good. He records the existence in the Trenton limestone at 

 Brighain's Lake, Hull, of locrinus subcrassus, Glyptocrinus decadactylus, 

 and Gl. parvus. 



Chapman, E. J. — A Classification of Crinoids. (Trans. Koyal Soc. Can- 

 ada, vol. I, section iv, 1882, pp. 113-116. Montreal, 1883.) [Ap- 

 peared 1884.] 



This classification is based on the presence or absence of a canalicu- 

 lated structure in the calyx and arm-plates. The author makes three 

 divisions with a subdivision in the first and second divisions. In the 

 first division the plates (apart from the stem segments) are without in- 

 ternal canals ; in the second the arm-plates are perforated internally ; 

 and in the third a system of canals radiates from the base of the calyx 

 to the extremities of the arms. The following is a summary of the clas- 

 sification: 



I. Emedullata : 



1. Amplicincta : 



1. Proclinata (e. g. Cheirocrinus). 



2. Attenuata (e. g. Pisocrinus; Hybocrinus). 



3. Spatiosa (e. g. Platycrinus). 



4. Pinnigera {e. g. Poteriocrinus). 



5. Disjuncta (e. g. Marsupites). 



2. Multicincta: 



1. Squamosa (e. g. Ichthyocrinus). 



2. Copulata {e. g. Melocriuus ; Eucalyptocrinus). 



3. Ornata {e. g. Actinocrinus ; Glyptocrinus). 



4. Opulenta {e. g. Polyi)eltes). 



5. Mutica (e. g. Uintacrinus). 



II. Fistulata: 



1. Eamosa {e. g. Cyathocrinus) 



2. Foliata {e. g. Crotalocrinus). 



3. Fimbriata (e. g. Cupressocrinus). 



4. Quadrata {e. g. Gasterocoma). 



III. Canaliculata : 



1. Crassicincta : 



1. Frondosa {e. g. Pentacrinus). 



2. Vagata (e. g. Antedon). 



3. Florifera {e. g. Encrinus). 



4. Coadunata {e. g. Eugeniacrinus). 



5. Conformata {e. g. Apiocrinus; Bourgetticrinus ; Ehizo- 



crinus). 



2. Tenuicincta: 



1. Carinata (e. g. Hyocrinus). 



2. Truncata {e. g. Holopus). 



