CLYPEASTER PALLIDUS. 25 



deatli antl Ihcii gradually changin};; to brown, dull greenish, 



greenish yellow or pale buff virescens. 



Test about .S0-.S.5 as wide as long, somewhat depressed distal to 

 petals; color, yellow of several shades, with dusky markings, 



hardly changing at all after death Ii ptoslracon. 



'rimary tubercles of interambulacra orally, very large and deeply 

 simken, bearing long .spines which are conspicuously flattened and 

 expanded at tip; petals in adults half as wide as long or le.ss . . Uimprus. 



Clypeaster rosaceus. 



Echinus rosaceus Linne, 17.58. Syst. Xat., ed. 10, p. 66.5. 

 Clypeaster rosaceus Lamarck, 1801. Syst. Anini. sans Vert., p. 349. 



Echinanthus rosaceus Gray, 1825. Ann. Phil., 26, p. 427. A. Agassiz, 1872. Rev. Ech., pt. 1, p. 106. 

 Clypeaster reticulatus Loven, 1887. Bih. K. Svenska Vet.-Akad. Handl., 13, afd. 4, no. 5, p. 175. 

 Diplothecanthus reticulatus Duncan, 1889. Journ. Linn. Soc, Zool., 23, p. 1.5.3. (Bronn's Thier- 

 rcichs, 19t)4, 2, abt. 3, bueh 4, p. 1382). 



Plate 123, fig. 7. 



This is a characteristic species of the West Indian region, ranging as far 

 northward as Charleston, S. C. 



Clypeaster pallidus, sp. nov. 

 Plates 122, figs. 16~1S; 123, figs. 2-^; 139, figs. 1-3. 



Length 108 mm.; breadth, So mm.; height, 42 mm. ; mouth sunken 22 mm. 

 below sides of test. Test rather evenly convex, sloping uniformly from ambi- 

 tus to apex; median areas of petals little elevated above pore-pairs and hardly 

 at all higher than interambulacra. Tuberculation of test quite uniform ; pri- 

 mary tubercles with sunken areolae, from 100 to 150 per sq. cm. of test surface 

 aborally ; ridges between pore-pairs of unpaired petal with a single series of 6-7 

 primaries; miliary tubercles six or seven times as numerous as primaries, low 

 and granular. Madreporite stellate, 5 mm. across, the ocular plates and pores 

 fairly distinct in the re-entrant angles. Genital pores moderately large, 1-2 

 mm. distant from the madreporite, in the interradii. Unpaired petal with 39 

 pore-pairs on each side, 37 mm. long, 19 mm. wide at middle, and 20 mm. wide, 

 half way between middle and tip; the median area is 9 mm. and 10 mm. at 

 the same two points respectively; hence the poriferous areas are about 5 mm. 

 across where widest ; the petal is o]:)en by fully 3 mm. Anterior petals somewhat 



