32' C. Dat'ies Sherboni — Irregular Chalk Echinoids. 



part of the mxicronata zone at Norwich. Brydone, in his 

 '* Stratigraphy and Fauna of the Trimmingham Chalk," 1900, 

 p. 12, refers this to ' Echinoconus {abhreviatiis ?),' hut Dr. Bather 

 has carefully gone into the matter with me and agrees that the 

 determination witii orhignyanus of Agassiz is correct. Range : 

 (?) upper part of B. mricronata zone and the Dauian Chalk of 

 Trimiugham. 



Conulus globulus (Desor). Galerites globulus, Desor [^tion Leske], 

 Mon. Echin. (Galerites), 1842, p. 18, pi. iv, figs. 1-4. Range: 

 Marsupites zone. 



Conulus subrotundus, Mantell : Geol. Sussex, 1822, p. 191, pi. xvii, 

 figs. 15-18. Range : 1\ gracilis and B. cuvieri zones. 



Conulus castaneus (Brongniart). Nudeolites castaneus, Brongniart, 

 Geol. environs Paris, 1822, pi. ix, fig. 14. Range : T. gracilis 

 and R. cuvieri zones. 



Discoidea dixoni, Forbes. Galerites {Discoidea) dixoni, Forbes, in 

 Dixon, Geol. Sussex, 1850, p. 341, pi. xxiv, figs. 13, 14. Range : 

 B. cuvieri to H. planus (1 example) zones. 



Micraster cor-anguinum (Leske). Spatangus cor-anguinum, Leske, 

 Addit. ad Klein, Nat. Dispos. Echin., 1778, p. 221, pi. xxiii," 

 fig. c (anglicum). Range : M. cor-anguinum to B. mucronata 

 zones. 



Micraster cor-testudinnrium (Goldfuss). Spatangus cor-testudinarium, 

 Goldfuss, Petref. German., 1829, p. 15(3, pi. xlviii, fig. 5. 

 Range : H. planus to base of M. cor-anguinum zones. 



Micraster prcecursor, Rowe : Quart. Journ. Geol. Soc, vol.lv (1899), 

 p. 530. Range : top of T. gracilis (1 example) to base of 

 M. cor-anguinum zones. 



Micraster leskei (Des Moulins). Spatangus lesTcei, Des Moulins, 

 Etudes Echin., 1837, pt. 3, p. 392. Range : B. cuvieri to 

 H. planus zones. 



Micraster cor-bovis, Forbes : in Dixon, Geol. Sussex, 1st ed., 1850, 

 p. 342, pi. xxiv, figs. 3, 4. Range : B. cuvieri to base of 

 M. cor-testudinarium (2 examples) zones. 



Epiaster gihbiis (Lamarck). Spatangus gibbus, Lamarck, Anim. 

 sans Vert., iii, 1816, p. 33. Range : M. cor-testudinarium 

 (1 example) to Marsupites, and B. mucronata zones. 



In/ulaster excentricus (Rose). Spatangus excentricus, C. B. Rose, in 

 Woodward, Geol. Norfolk, 1833, p. 37, pi. i, fig. 5. Range : 

 M. cor-anguinum to B. mucronata zones (teste Cret. Rocks Brit., 

 iii, Mem. Geol. Surv., 1904, p. 500). Recorded by Burnet 

 (Geol. Mag., 1904, p. 175) from the Holaster planus zone of 

 Lincolnshire. The type came from the Norwich gravels. Only 

 known to Rowe and myself from the M. cor-anguinum zone ; not 

 seen from Marsupites or A. qnadratus zones ; not in the Fitch 

 Collection, and not found by us in the B. mucronata zone at 

 Norwich or elsewhere. If a specimen were found below the 

 M. cor-anguinum zone, we should suspect it to be Cardiaster 

 cotleaxianus, but the material yet known is not sufficient to work 

 out the relationships and differences of these two forms. 



