132 Bulletin, Yanderbilt Marine Museum, Vol. IV 



The test is somewhat conical, the width diameter one and two- 

 thirds times the height diameter. The ambulacral and interambulacral 

 areas both have the tubercles arranged in regular vertical rows, 

 closely crowded on the lower surface in the interambulacral area, 

 with but one vertical row of large tubercles extending from the 

 ambitus to the apex; the one next to the poriferous zone gradually 

 becoming much smaller, while the others, according to the size of the 

 specimen, extend in varying degree toward the abactinal region, 

 leaving a bare median space on which the granulation of the plate 

 is very fine and compact. The secondaries are far apart and irregu- 

 larly scattered around the primaries. In the ambulacral space only 

 the vertical rows of tubercles extend to the abactinal region, the 

 others but a short way above the ambitus, leaving a bare median 

 space as in the interambulacral space. The spines which are short, 

 needle-like, vary much in thickness and coloration. The buccal mem- 

 brane is entirely covered by closely crowded, prominent, large plates. 

 There is a depression of the median interambulacral space near the 

 apex, leaving the ambulacra elevated. 



The pedicellariae are of the three types figured. (Plate 85.) 

 References : Cidaris variegatus Leske, Add. ad Klein, p. 149, tab. X, 

 figs. B, C, 1778. 



Echinus variegatus Lamarck, Anim. sans Vert., 2nd ed., vol. Ill, 

 p. 365, 1816. 



Lytechinus variegatus A. Agassiz, Bull. Mus. Comp. Zool., vol. 1, 

 p. 24, 1863.— H. L. Clark, Univ. Iowa Studies Nat. Hist, vol. 9, 

 p. 113, 1922 ; Cat. Recent Sea Urchins, Brit. Mus., p. 120, 1925. 



Toxopneustes variegatus A. Agassiz, Rev. Echini, part I, p. 298, 

 pi. II, figs. 5, 6, pi. IVa, figs. 4, 5, pi. VII, figs. 7-20, 1872.— 

 H. L. Clark, Rept. U. S. Fish. Comm, vol. XX, part 2, p. 253, 

 1900. 



Genus : TRIPNEUSTES A. Agassiz. 

 Tripneustes esculentus (Leske). 



Plate 86. 



Type: Leske 's type material came from the West Indies. The 

 species was founded on specimens in the museums of Trier, Linck and 

 Richter. Most of Leske 's types are now in the Leipsig Museum. 



Distribution : Littoral to 690 fms., West Indian region. Dr. Mor- 

 tensen has also recorded this urchin from West Africa. 



