POLYZOA. 137 



Affinities and differences. This Urchin is remarkably similar 

 to the Peltastes Studeri 1 (Cotteau) of the French Aptien rocks, 

 agreeing with that species in general shape and size, in the 

 grooved character of the apical disc, and also in much of the detail 

 of the tubercles ; but our Upware species is a true Salenia, not a 

 Peltastes ; and the median zone of tubercles in the interambu- 

 lacral area is somewhat broader, and the tubercles closer packed 

 than in P. Studeri. Again, the latter has straight ambulacral 

 areas, and possesses a series of six tubercles. 



The nature of the apical disc, especially its highly developed 

 grooving and the prominent anal aperture serve to distinguish this 

 from other species of Salenia. 



Locality. Brickhill. 



POLYZOA. 



(See ante, p. 27.) 



Repto.uulttsparsa Haimeana, de Loriol. 



ICeptomultisparsa Haimeana, de Loriol, Anim. Invert. Mont. 

 Saleve, p. 136, pi. 17, f. 4. 



Our Upware specimen (only one is known, Woodw. Mus.) is 

 finely developed, the mass measuring three inches in length. De 

 LorioUs type is about one inch across. 



Localities. Upware. 



S. Europe. Mont Saleve, Middle Neocomian. 



Entalophora ramosissima, d'Orbigny. 

 Entalophora ramosissima, d'Orbigny, Pal. Fr. Terr. Cret. V. 

 p. 785, pi. G18, figs. 1—5. 



Localities. Upware, Brickhill, Farringdon. 

 S. Europe. Villers, Calvados (Cenomanien). 



Entalophora angusta, d'Orbigny? 

 Entalophora gracilis, d'Orb. Pal.. Fr. Terr. Cret. V. pi. 617, f. 1 — 4. 

 E. angusta, p. 783. 



In our species the cells are more definitely bounded and closer 

 packed than in d'Orbigny 's figures. 



1 Cotteau, Pal. Franraise, Terrains Cretaces, Ech. n. p. Ill, pi. 1026. 



