170 



PAXAMIC DEEP SEA ECHINI. 



oculars occupy notches in this central plate. The apical system is also very 

 similar to that of Phrissocystis aculeata, Fig. 276, of Argopatagus, Fig. 252, 



and Homolampas, Fig. 258; in 

 Palaeotropus there are, however, 

 only three genital pores. 



23 mm. 



Fig. 245. Pal^otbopls Loveni. 



23 mm. 



Fig. 246. Pal.botropus Loveni. 



Koehler^ has called attention to the relations of P. Hirondellei to the 

 other species of the genus. We may add the following to his notes. 



Fio. 247. PAL.EOTUOPrs Joskpuin.e. 

 After Loveni. 



23 mm. 



Fig. 248. Palj^otropvs Lovexi. 



Pakcotropus Illroiiddlcl Kochler^ differs from P. Joscphina'/^ and P. Loveni 

 by its coarse tuberculation, the splitting up of the central plate into its 



* Campagnes Scientifiques <lu Prince do ^lonaoo. Fasc, Xll. Echinides et Ophiures du Yacht 

 I'llirondelle, par U. KochU'r, 1898. p. 20. 



2 Koehlcr, Inc. cit Pis. V, figs. I'J-ll; VI, figs. 27.28. 



• Koehlor inadverently mentions P. Josepliiixe aa described by me. It sbcnild bo referred to 

 LoviMi, wlio established the genus, and who dei.cribed the first species of the genus; Loveu, £tude5, 

 p. 17, PI. XIII, figs. 108-113. 



