8 CATALOGUE OF THE BLASTOIDEA. 



next year witnessed the production of another paper by Hambach l , who reiterated 

 .his previous assertions respecting the presence of tentacles on the ambulacra, and the 

 absence of summit-plates. At the same time he endeavoured to show the arbitrary 

 nature of the classification which we had proposed for the different generic types 

 hitherto referred to Pentrcmites ; though he concluded by evolving a classification of 

 the so-called Pentrcmites, which was based upon almost the same principles as our 

 own, and was therefore, to a large extent, identical with it. But he refused to 

 recognize any genera but Granatocrinus and Orophocrinus out of the six which have 

 been removed from the old genus Pentrcmites by various authors, including his 

 co-workers in America. A preliminary criticism of Hambach's views by Dr. P. H. 

 Carpenter 2 is the latest addition to the literature of the Blastoidea up to the autumn 

 of 1885 3 . 



1 " Notes about the Structure and Classification of the Pentremites." Trans. St. Louis Acad. Sci. 1884, 

 vol. iv. no. 3, pp. 537-547. 



2 "Further Remarks upon the Morphology of the Blastoidea." Ann. & Mag. Nat. Hist. 1885, vol. xv. 

 pp. 277-300. 



3 A complete Bibliography of the Blastoidea will be found at the end of the Catalogue. 



