.1 - 



has not "been recordel from anj^ liorizoii Ibv/er than the Pleistocenef 2) . 



(1). Univ. 3onch., vol. 2, fig. 154, 1784 i'^,. anierioaxi-.is Lamarok, 

 Anim. sariS Vert., vol. 5, p. 188, 1819; "?eeve, Oonch. Icon., 

 S-oonarln.s . tdI. 14, fig. 17, 185G; 3. s-'athnlif ems lamarck. 

 etc. 



(2). Ga'oh's Santo Doraingian _S. americanus (Trans, im. ^hilos. 

 3oG. ( new ser.4 vol. 15, p. 257, 1875) is S.* '~"i<rQanornocon 

 Brown anri "^iishrv (Proc. Aoad. ::at. 3ei., "hiladplphia, vol. 

 64, p. 514 f foot-note) 1912); while his Gosta aioan 'Mio- 

 cene an eric anus (Joirr. Aca'^ . ITa-^. Sci., Philadelr^hia, 2nd 

 ser. , vol. C, p. ?.79, 18^1) prohahlj; is distinct. 



i'o recent forms, comoarahle in si:^e, have heen available for com- 

 parison. The spines of the form which has generally been called 

 spa thulif ems a e more comoressed dorso-ventrally, rath their ex- 

 tremities irregularly erentilate'"* , biit a-oparently the ch-aracter of 

 the spinose sculptiuce is decidedly iixonstant, an inrlication of 

 the variability being furnished by the elaborate synonymy given 

 by Dall iZ). 



("). Trans, ",'agner Tree T . ":■!., ''hiladel-ohia, vol. ?, pt. 4, 

 pp. 759-760, 1098. 



The single "^07".ien r-oe ci^'.r-^n is n■'^'^i.r^Gt^ri7e'^ b'" the loiig soines 

 or irregular, transverce scales on the priraary ra-Uals and minute- 

 ly scabrous secondaries; these features serve to differe tiate 

 it sharply from the associetft-l gnecies. 



Occurrence .- lov/er I'.iocene: 3owdcn beds, '^-^-''a , ai.^a. 



