SYSTEMATIC DESCRIPTIONS CENTRECHINOIDA. 25 



Family PHYMOSOMATJIX-E Meissner, 1903. 

 Genus PHYMOSOMA Haime, 1853.1 



Type species. Cidaris konigii Mantell, 1822, Geology of Sussex, 

 p. 189. . 



Phymosoma cubense (Egozcue). 



Cyphosoma cubense Egozcue in Cotteau, 1897, Bol. Com. Mapa Geol. Espana, vol. 22, p. 12, 

 plate 1, figs. 4 to 9. 



Cretaceous, ingenio Conception de Montalvo, Cienfuegos, Province 

 of Santa Clara, Cuba, very rare, collection of Comisi6n del Mapa 

 Geologico de Espana, Madrid. 



Suborder CAMERODONTA Jackson, 1912. 



Family ECHINOMETRID^ Gray, 1855. 



Genus ECHINOMETRA Gray, 1825. 



Type species. Echinus lucunter Linne, 1758, Sys. Nat., ed. 10, p. 665. 



Echinometra prisca Cotteau. 

 (Plate 1, Figures 21 to 24.) 



Echinometra acufera Guppy (now Blainville), 1866, Quart. Jour. Geol. Soc. London, vol. 



22, p. 299. 

 Echinometra prisca Cotteau, 1875, Kongl. Sven. Vet. Akad. Handl., vol. 13, No. 6, p. 12, 



plate 1, figs. 19 to 27. Guppy, 1882, Sclent. Assoc. Trinidad, Proc., part 12, p. 195. 



The following is an extract from the original description of this 

 species : 



Species of relatively small size, elongate, oblique. Upper face moderately 

 swollen, lower face slightly hollowed. Ambulacral areas straight dorsally, 

 subundulate at the ambitus and ventrally. Pores small ; rounded, in arcs 

 of 3 or 4 pairs. Ambulacral areas wide, with 2 rows of tubercles which are 

 strongly mammillate, regularly disposed, diminishing in size toward the 

 peristome and apical disk. Space between the 2 rows of tubercles occupied 

 by some granules irregularly disposed. Interambulacral areas with 2 rows 

 of prominent tubercles similar to those of the ambulacral areas, a little 

 more developed, however, especially dorsally. Accompanying these primary 

 tubercles are 4 rows of secondary tubercles, 1 on each side of the ambulacral 

 areas and 2 in the miliary zone. The secondary tubercles, which are much 

 smaller than the others, especially those which occupy the middle of the 

 miliary area, form incomplete ranges, a little irregular, which^ disappear 

 dorsally and before arriving at the peristome. The granules which accom- 

 pany these are very unequal and are placed without order, tending, how- 

 ever, to group themselves around the tubercles of the upper side. Peristome 

 very large, subcircular, a little oval, with weak cuts, strengthened on the 

 border. 



The largest specimen from Anguilla measures 16 mm. in height, 

 33.5 mm. in length, and 27.5 mm. in width. A smaller specimen, very 

 well preserved, also from Anguilla, measures 11 mm. in height, 24.5 



1 The name Cyphosoma for the genus was preoccupied for Coleoptera and the name Phymosoma 

 of Haime was substituted by A. Agassiz, Revision of the Echini, pt. 1, p. 151. 



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