412 Bibliographical Notices. 



found that it does contain a very large number of the less known 

 names ; but we are not a little surprised at the omission of the three 

 species described in 1884 by llingueberg in the ' Proceedings of the 

 Academy of Natural Sciences of Philadelphia,' the same journal in 

 which the successive parts of the ' Eevision' appeared, viz. Triacrinus 

 pyriformis^ T. r/hbosus, and Encalyptocrinus inconspectiis. Ringue- 

 berg described his new genus Triacrinus as allied to Hybocrinus ; 

 but neither in the section on the Hybocriiiidte nor anywhere else in 

 the third part of the ' Revision ' can we find any mention of Ringue- 

 berg's genus. 



We also miss any reference in the index to Apiocrlnus dipentas, and 

 likewise to Isocrimis nobilis and Cldadocrinus nobilis, synonyms of the 

 type which Wachsmuth and Springer call Taxocrinus nobilis ; while 

 the references which are given to two other synonyms of this species 

 {Poteriocrimis nobilis and Forbesiocrinus nobilis) are both incorrect. 

 It would have been better too if the names Barrandeocrinus, Canis- 

 trocrinus, and Centrocrinus had been placed respectively before 

 Barycrinus, Carabocrinus, and Ceriocrinus, instead of after these 

 names. 



In spite of these and other errors of detail, however, many of 

 which are no doubt due to the circumstances under which the work 

 was prepared, as hinted on p. 209 of Part III., we have no hesitation 

 in saying that the ' Revision of the Palteocrinoidea ' is a memoir of 

 the utmost value and importance. It will be indispensable alike to 

 the morphologist who wishes to study the remarkable Crinoid types 

 which flourished in the Palaeozoic seas, and to the pure systematist 

 who desires a natural classification of one of the great groups of 

 Echinoderms — that large subkingdom in the study of which one may 

 find some relief from tlie everlasting strife about the mutual rela- 

 tions of Worms and Arthropods, Ascidians and Vertebrates, and aU 

 the latest productions of the most advanced speculative zoology ; 

 while the stratigraphical palaeontologist, who wishes to determine 

 the age of a bed by the characters of its fossils, will find in the 

 ' Revision ' much food for reflection in the most valuable informa- 

 tion respecting transition-forms in Crinoids and their paljBontological 

 development through a long series of strata. 



P. Hebbert Carpenieb. 



Cataloque of the Blastoidea in the Geological Department of the 

 British Museum {Natural History), with an Account of the 

 Mor^ihology and Systematic Position of the Group, and a Revision 

 of the Genera and Species. By Robert Etheridge, Jun., and 

 P. Herbert Carpenter, D.Sc, P.R.S., E.L.S. 4to. Pp. i-xvi, 

 1-322 ; 20 plates. London : Printed by Order of the Trustees, 

 18SG. 



A ■SEAR and a half ago we noticed in this Journal * a very important 

 * Ann. & Mag. Nat. Hist. ter. 5, vol. xv. p. 346. 



