144 SVF.N LOVEN, ON THE ECHINOIDKA DESCRIBEI) BY LINN^US. 



transversc rows of verv minute granules, diminutive at tlu- 

 suturo. 



Withiu tlie calyx tlie costals are grauulated, aud the 

 oraiiules laroer at tlie aboral martyin and on the sides of the 

 pore. This in the 1, 5, 4, 3, of 6,2 5 mra., is placed a 1,2 5 

 mm. from the adoral margin, whicli is at the outer 0,2 of 

 the radial diameter, whilc in the 2, of 8,3 mm., it is placed 

 at 0,15. The corresponding measures in the E. Cidaris being 

 0,3 and 0,18, the rule observed in C. papillata is seen to hold 

 good, and to point to tlie C. bacnlosa as a yonnger spccimen, 

 and the Linnean type as an older one of one and the same 

 species. The radials are triangulär, truncatcd aborally, emar- 

 o-inated adorallv, and their jrranules like those of the co- 

 stals. 



From this it will have been seen that the conformity 

 between the type of the Echinns Cidaris L. and the Cidaris 

 bacnlosa Lamck. is sucli as to demand their being nnited nnder 

 one and the same species name, whilc the differences are only 

 such as mark different stages of individual development. The 

 Linnean tvpe is a matiire spccimen of the: 



Cidaris baeulosa Lamarck. 



1752. Echiuus Cidaris Ij. teste the MS Lecture ou the \'eimcs. 

 1816. Cidarites baeulosa Lamck., An. s. Vert., III. p. 55. 

 » » » 1826. AuDoriN, Explic. 



somm. Descr. Egypte, 

 p. 210; Savigny, Echi- 

 nod. t. 7, f. 1,1 — 8. 

 » » » 1845. MiCHELiN, Rev. Mag. 



Zool. Zooph. p. 16, 

 t. 8. 

 Cidaris » » 1847. Ag. Des., C. Ii. p. 23. 



» » » 1866. v. INIartens, Arch. f. 



Nat. XXXII, I, p. 

 144. 

 Phyllacanthus » » 1872. Al. Agassiz, Rev. ]>. 



150, 388, t. I/, f. 4, 

 5 ; I ^, f . 34—88 ; I <\ 

 f. 11-20 a. 



