253 



NOTES 



On Foreign Jurassic species of the genus ACROSALENIA nearly allied to 

 British forms, but which have not yet been found in the English Oolites. 



Acrosalenia Lamarckii, Desmoulins. Syn. Diadema Lamarchii, Desraoulins, Tabl. 



Synon., p. 316. 

 Hypodiadema Lamarckii, Desor, Synop. Echin. 

 Foss., tabl. 10, figs. 1 — 5. 



Test small, inflated at the sides ; ambulacra straight, with two marginal rows of small, 

 distant, marginal tubercles, and a miliary zone of fine granulations between the rows ; 

 inter-ambulacral tubercles large at the equator, the three uppermost pairs rudimentary ; 

 miliary zone wide, composed of six rows of granules at the equator, which cover the whole 

 surface of the plates on the upper surface ; mouth opening small, base flat, peristome 

 pentagonal, apical disc convex, sur-anal composed of several (six to eight) pieces. 



Dimensions. — Height, half an inch; transverse diameter, nine tenths of an inch. 

 Spines, according to M. Desor, "en forme de petits batons cylin- 

 driques, d'apparence lisse, a bouton haut." 



Formation. — Cornbrash (Bathonien) de Marquise ; abundant. 



Collections. — In all English and Foreign public collections. My cabinet. 



x^crosalenia Bouchardii, Desor. Synopsis des Echinides Fossiles, p. 142. 



Test globular, depressed on the upper and under surfaces ; ambulacra narrow, with 

 two marginal rows of small tubercles, and a double row of granules between them ; inter- 

 ambulacral tubercles, nine in each row, diminishing gradually in size from the equator 



