92 



HEMICIDARIS. 



Hemicidaris confluens, M'Coy. 



Hemicidabis conflubns. M'Coy, Annals and Magazine of Natural History, vol. ii, new 



series, p. 411. 



— — Forbes, Memoirs of the Geological Survey, Decade V, Notes on 



Hemicidaris. 



— — Morris, Catalogue of British Fossils, 2d edition, 1854, p. 82. 



— — Wright, On the Cidaridse of the Oolites, Annals and Magazine 



of Natural History, 2d series, vol. viii, p. 258. 



Through the kindness of Professor Sedgwick, I have been enabled to examine the 

 type specimen of this urchin, which forms part of the geological collection of the University 

 of Cambridge. It proves to be a bad specimen of an Acrosalenia, with the test so much 

 defaced as to be specifically indeterminable. It unquestionably was collected from the 

 shelly beds of the Great Oolite of Minchinhampton. This species must now therefore be 

 omitted from the list of Hemicidaris. 



C. Species from the Coralline Oolite, including the Calcareous (rr^Y.=14th Mage, 



Corallien, d'Orbigny. 



Hemicidaris intermedia, Fleming. PL IV, fig. 1 a, b, c, d, e,f,g, h, o. 



CiDABIS PAPILLATA. 



— intebmedia. 

 Hemicidabis crenulaeis. 

 Hemicidabis inteemedia. 



CiDAEIS INTEEMEDIA. 

 PAPILLATA. 



Var. of Parkinson, Organic Remains, vol. iii, p. 14, pi. l,fig. 6, 



and pi. 4. fig. 20. 

 Fleming, British Animals (1828), p. 478. 

 Morris, Catalogue of British Fossils (1843), p. 53. 

 Forbes, Memoirs of the Geological Survey, Decade III, pi. 4. 

 Wright, On the Cidaridse of the Oolites, Annals and Magazine 



of Natural History, 2d series, vol. viii, p. 252. 

 Desor, Synopsis des Echinides Fossiles, p. 52. 

 Morris, Catalogue of British Fossils, 2d edition, 1854, p. 82. 

 Phillips, Geology of Yoi-kshire, p. 127. 

 Young and Bird, A Geological Survey of the Yorkshire Coast, 



pi. 4, fig. I, p. 211. 



Test sub-globose or sub-conoidal ; ambulacral areas slightly undulated above, with a 

 double row of minute, perforated, marginal tubercles on the sides, and six pairs of semi- 

 tubercles at the base ; inter-ambulacral areas with eight pairs of primary tubercles, on 

 large prominent bosses, having deeply crenulated summits ; apical disc not prominent ; 

 anus nearly central ; mouth opening large, peristome deeply notched and divided into 

 ten \mequal-sized lobes. Spines long, round, and tapering to a blunt point ; surface with 



