﻿242 



CATOPYGUS 



* Catopygus carinatus, Agassiz. Prodrome Echinides, p. 18, 1836. 



Nucleolites columbaria, Desmoulins. Etudes sur les Echinides, p. 356, 1837. 



— carinatus, d'Archiac. Mem. Geol. Soc. de France, p. 180, 1837. 

 Catopygus — Bronn. Lethee Geognostica, p. 613, 1837. 



— — Milne-Edwards. In Lamarck, 2e ed., t. hi, p. 351, 1840. 

 Nucleolites columbaria, Ibid. Ibid., 344. 



Catopygus carinatus, Agassiz. Cat. Syst., p. 4, 1840. 



— — Roemer. Norddeuts-Kreide-Gebirges, p. 32, 1840. 

 Catopygus carinatus, Morris. Catalogue of British Fossils, p. 49, 1843. 



— columbarius, d'Arckiac. Mem. Soc. geol. France, p. 296, 1847. 



— — Agassiz et Desor. Cat. raison., p. 100, Modele R 71 



1847. 



— — d'Orbigny. Prod., t. i, p. 178, Etage 20, 1847. 

 Nucleolites carinatus, Forbes. Mem. Geol. Surv., Decade i, pi. 10, 1849. 

 Catopygus — ■ Sorignet. Oursins de 1'Eure, p. 43, 1850. 

 Nucleolites — Quenstedt. Handbuch der Petrefact., p. 586, pi. xlix, 



fig. 51, 1852. 



Catopygus — Bronn. Leth. Geogn., 2 ed., p. 196, pi. 29 3 , fig. 16, 1852. 



— — Alhin Gras. Catal. des Corps org. de l'lsere, p. 40,1852. 

 _ _ Morris. Catal. of British Fossils, 2 ed, p. 74, 1854. 



— columbarius, Cotteau. Pal. Franc. Ter. Cret., t. vi, p. 436, pi. 970, 1855. 



Diagnosis. — Test oval or subrotund, contracted anteriorly, enlarged and truncated 

 posteriorly, sides inflated, dorsal surface unequally convex, base nearly flat, ambulacra 

 narrow, dorsal, subpetaloid and open below; inter-arnbulacra wide, single inter-ambulacrum 

 narrow, elevated, and truncated, vent round in the upper border, above the periprocte 

 an obtuse carina which terminates in the projecting upper border of the vent ; mouth- 

 opening small, excentral nearer the anterior border, peristome surrounded by five prominent 

 lobes and a rosette of pores between them. Apical disc excentral nearer the anterior 

 border, the vertex in general behind the apex. 



Dimensions. — I have selected six good typical forms showing the varying proportions 

 of this species. 





1 



2 



3 



4 



5 



6 



Length 



1 



v l 2 





u l 2 



u l 2 



0-1- 



Height . 



u l 2 



u l 2 



0-8- 

 U l 2 



U l 2 



U l 2 



0-1- 



u l 2 



Breadth . 



U 12 



u l 2 



0-6- 

 "12 



0-6- 

 U l 2 



0-6- 

 U l 2 



u l 2 



Description. — The table of synonyms exhibits the changing views of naturalists in 

 respect to this beautiful Urchin. Goldfuss, who gave the first good figure of the species, 

 cites, with doubt, its identity with Nucleolites columbarius, Lamarck, but the brief diagnosis 

 in ' Hist. Nat. des Anim. sans Vert.,' taken in connection with the locality and stratum 

 from whence it was collected, " les environs de Mans,'' so well known for its beautiful Upper- 



