59 



NOTES 



On some Foreign Jurassic species of CIDARIDtE nearly allied to British forms, 



BUT WHICH have NOT YET BEEN FOUND IN THE ENGLISH OoLITES. 



Genus— GIDAmS. 



A. Species from the Lias. 



CiDARis Amalthei. Qucnstedt, Petrefactenkunde, p. 574, t. 48, figs. 28 — 30. 



The inter-anibulacral plates only are known ; they attain a large size, nearly an inch 

 in breadth ; the tubercles are not so large in proportion, but they are deeply crenulated, 

 and have a large perforation in their summit ; areolas elHptical, large, distinct ; scrobicular 

 granules not larger than those filling the mihary zone. Spines long, slender ; stem with 

 small, forward-directed prickles; head and acetabulum large; rim deeply crenulated; 

 ring prominent ; neck partially covered with fine longitudinal lines. 



Formation. — Lias, Donau-Mainkanal bei Dorlbach. 



Collections. — Museums of Bonn, Stuttgart ; Professor Quenstedt. Specimens in my 

 Cabinet sent by Dr. Fraas. 



B. Species from the Inferior Oolite. 

 CiDARis Lorierii, Wright^ nov. sp., 1855. 



Test high, one inch and two tenths, transverse diameter two inches, inchning to a 

 pyriform figure, narrow towards the base, and broad and flat at the upper surface ; ambu- 

 lacra flat, with four rows of granules ; poriferous zones as wide as the area, pores round, 

 separated by thick septa ; inter-ambulacra with seven or eight plates in each column ; 

 areolas wide, superficial, with sharply defined margins, surrounded by small granules, of 

 the same size as those filhng the miliary zone, which is narrow, and shows the centro- 

 sutural zigzag line well defined; bosses prominent, with broad, deeply crenulated summits; 

 tubercles deeply and largely perforated, gradually increasing in size from the peristome to 

 the coronal plates ; disc opening small and circular. 



