74 FOSSIL ECHINI FROM THE TERTIARY 



As the fossils have been fully described by Herklots in 

 the publication mentioned above , a short enumeration of 

 my diagnoses may suffice, with the exception of two fos- 

 sils , which , curiously enough , Herklots has never mentio- 

 ned. I may here remark, that Herklots' figures are often 

 incorrect, showing either more or less than the fossils them- 

 selves , a circumstance which I am obliged to mention , in 

 order to explain the discrepancies between those figures and 

 the diagnoses , which I am about to give. 



1. Phffllacnnthus huculosn Ag. I cannot regard 

 the fossil, which Herklots described as Cidaris rugata 

 (1. c. pag. 3) , although it is in an imperfect state of 

 preservation, as distinct from this species. It is very pro- 

 bable , if not certain , that the spine figured PI. I , Fig. 2 

 also belongs to the same species. 



Cidaris halaensis d' Arch et Haime (Descript. des anim. 

 toss, de rinde pag. 196, tab. 13, fig. 2) is indoubtedly 

 closely allied to Ph. bacidosa Ag. , although the minute mi- 

 liaries , which cover the median interambulacral space , are 

 less densely arranged , as far as the figure at least permits 

 to judge. Still it may prove to be identical on compari- 

 son with the typical specimen. 



2. Tetnnopleurus foreumaticus Ag. Herklots has 

 established two species . T. areolatus and T. caelatus (1. c. 

 pag. 4 a 5) , which differ from the normal T. toreumaticus 

 in some few respects. In T. areolatus the horizontal pits 

 between the interambulacral plates of the same vertical row 

 penetrate for a short distance into the contiguous plates of the 

 adjacent row , causing the internal borders of these to take 

 a forked appearance (Comp. Herkl. 1. c. PI. I. Fig. 5^). 

 T. caelatus is distinguished from T. toreumaticus by having 

 smaller primary tubercles. Now I have been able to examine 

 a series of recent specimens of the last named species from 

 Japan , in which the forked appearance of the internal 

 borders of the plates is either absent or hardly conspicuous 

 or vfeW marked , and which show at the same time rows of 

 smaller primary tubercles. 1 have no reason to doubt the 



Notes IroMi the Leyden !M.useutn, "N'^ol. 11. 



