3S6 CIDARIS THOUARSH. 



mammary boss of the primaries is much larger than in C. tribuloides ; the 

 primary spines arc larger and stouter, in proportion to the size of test, than 

 in the West India species, the granulation coarser; the secondary spines and 

 miliary papilUe are dark violet, and narrower than the corresponding spines 

 of the West India species. The granulation of the spines frequently 

 appears late; they are then longitudinally striated and pointed. 



There are usually hut two iniliaries on the imbricating perforated scales of 

 the buccal membrane. 



In large specimens the median ambulacral zone is filled by six irreer- 

 ular vertical rows of minute iniliaries. The primary interainhulacral 

 tubercles of the main vertical row are far apart. The median inter- 

 amhulacral space is completely Idled by minute iniliaries. increasing in 

 size towards the primary tubercles, carrying small papilla' arranged in 

 irregular transverse horizontal rows separated by more or less well-marked 

 furrows. These large specimens of Thouarsii are mentioned by Dr. 

 Liitken and by Prof Verrill in his Notes on Radiata as a new species ot 

 Cidaris from the Gulf of California. 



Panama; Gulf of California. 



Cidaris tribuloides 



' Cidariles tribuloides Lamk., i*lii. An. s. Vert. 

 ! Cidaris tribuloides Blainv., 1880, Zooph. 

 (See Part II. p. 253.) 



PL 1' ; PI. 1 . f. is 22; /'/. //. f. i .;: PL II. f. /.;; PI. VI. f. 21 ; PI 

 XXVIII. f. .1,4; PI XXXV. f. l ; PL XXXVIII. f. g— . 



Florida: Brazil; Cape Palmas. 



(CIDARIS.) Dorocidakis. 



Orlhocidaris (A. Ag.). 1868, non Cotteau. 

 Dorocidaris A. AoASS., 1SC9, Bull. M. C. Z., L 

 (See Part II. p. 2&4.) 



Dorocidaris papillata 



Cidaris papillata Lf.skk, 1778, Kl. Add. 



I Dorocidaris papillata A. A<;ass.. 1860, Bull. M. C. 7... I. 

 (See Pari II. p. 254.) 



PL I. ; PL P. ; PL P.f. ,.< ; S3 : PL IP./, i - 1.3; PI IP./. 1 - 5 ; PI II'. f. /.; - 15 ; 



I PL XXIV. f. 1-8. 



Norway ; Mediterranean ; Florida. 



