Reviews — Wachsfnuth if Springer'' a Monograph on Crinoids. 121 



The RhodocrinidEe present no difficulty, and complete the series 

 of Dicyclic Caiuerata. All the rest are Monocyclic. 



U'he Meiociinidee of Waclismuth and Springer comprise genera of 

 such diverse nature that it is straining the conception of a family 

 (as now recognized) to keep all under one name. At the same time 

 the relations of Eucali/ptocrinus and CaUicrinus to some of them are 

 confessedly intimate. On the other hand the subdivision into 

 Melocrinites and Dolatocrinites is not regarded as satisfactory, even 

 by its proposers. Similar criticism applies to the Batocrinid^ 

 and its subdivisions, and to the Actiuocriuidas. None the less the 

 reality of these large divisions should not be overloolted. I propose, 

 therefore, to divide the Dicyclica Camerata into three Suborders — 

 Melocrinoidea, Batoorinoidea, Actiuocrinoidea — and to subdivide 

 each of these into more limited families. The details will be given 

 more fully elsewhere,^ but it may be of interest to print a table tor 

 comparison. The genera are arranged in their supposed evolutionary 

 order. 



Melocrinoidea. 



1. Glyptocrinidae : Glyptocrinus, Schizocrinus, Periglyptocrinus. 



2. Melocriuidse : Sci/phocrmm, Mariacrmus, Melocnnus, Gtenocrinus. 



3. PateHiocriiiidse : Stehd'iocriiius. Macrostylocrinus, Allocrinus, Fatdliocrinus, 



Briarocrinus, Centriocriuus. 



4. Clonocriiiidse : OlomcnHus [= Curymbocr.), Polypeltes, Tryhliovrinus { — Spy- 



ridiocr.) , Technocrinus . 



5. Eucalyptocrinidae : CaUicnnus, Eucalyptocrinus. 



6. Dolatocrinidas : Dolatocrinus, IStereocrinus, Hadrocrinus. 



Batocrinoidea, 



1. Tanaocrinidse : Tanaocrinus. 



2. Xenocrinidse : Xenocrinus, Compsocrinus, Abacncrinus. 



3. Carpocrinidse : Acacocrinus, Desmidocrinus, Macarocrinus, Carpocrinus. 



4. Barrandeocrinidse : Barrandeocrmus. 



5. Coelocrinidse : Ccelocrinus (= Aorocr.), Dorycrinus, Ayiricocrinus. 



6. BatocrinidBe : Batocrinus, Eretmocrinus, AUoprosallocrinus, Eutrochocrinus, 



Dizygocrinics, Syperocrinus (= Lobocr.), Macrocrinus. 



7. PeriechocrinidsB : Feriechocrinus, Mrgistocrinus, Getvnceocrinm. 



ACTINOCRINOIDEA. 



1. Actiuocrinidee : Actinocrinus, Steganocrinus, Cactocrinus, Teleiocrinus, Fhy- 



setocrinus, Strotocrinus, 



2. Amplioracriuidse : Amplioracrmus. 



The possible non-acceptance of certain details in Wachsmuth 

 and. Springer's classification cannot affect the high value of the 

 Monograph, as a storehouse of facts both new and old, while the 

 Index and numerous tables enable one to track the contents with 

 ease. The following new genera are described : — 



Aulocrinus (p. 138, and pi. vii, fig. 9) is an ally of Scaphiocrinus, 

 characterized by a forked anal tube. May not this be a persistent 

 abnormality due to the presence of a commensal in the tube? 



Tanaocrinus (p. 185), Ordovician, referred to Keteocrinidse, but is 

 monocyclic and apparently a Batocrinoid ; in structure and in time it 

 is well fitted to be taken as an ancestor of the Oarpocrinidas. 



^ See " A Phylogenetic Classification of the Pelmatozoa," loc, cit. 



