112 IOWA STUDIES IN NATURAL HISTORY 



but the plates of the oeulo-genital ring are variegated with 

 greenish and reddish tints. Most of the abactinal tubercles are 

 pale red. The aetinal spines are nearly white but the bases of 

 the larger ones and more or less of the entire length of small 

 ones have a more or less marked greenish tinge. At and above 

 the ambitus some of the spines become more or less pale red, 

 the color being confined to the base of the spine or extending its 

 whole length. The pedieeUariae are white, as are the plates 

 which cover the peristome. 



The additional data which these Barbadian specimens furnish 

 show that calUpeplus is a very well marked species quite distinct 

 from any other member of the genus. In its coloration, it is 

 more like pictus and anamesiis of the western coast of Mexico, or 

 verruculatus of the Indo-Pacific region, than it is like its West 

 Indian congeners but the shade of red shown by the tubercles, 

 spines and abactinal spots is entirely different from anything 

 exhibited by the other spotted species. 



Station 7. May 16, 1918. AV. by N. Pelican Island, 2 miles, 

 80 fms. Rocky bottom. Tangles. 1 specimen. 



Station 11. May 17, 1918. li/4 miles due west from white 

 lighthouse at Needham Point, in line with red house, 67- 

 70 fms. Stony bottom. Dredge. 1 specimen. 



Station 35. May 23, 1918. S. W. of Needham Point, 21/2 

 miles off shore, 80-90 fms. Rocky bottom. Tangles. 1 

 specimen. 



Station 36. May 23, 1918. S. W. of Carlisle Bay, 2 miles off 

 shore, 80-90 fms. Rocky bottom. Tangles. 2 specimens. 



LYTECHINUS EUERCES 



H. L. Clark, 1912. Mem. M. C. Z., 34, p. 247 ; pi. 107, figs. 4-6. 



This typically West Indian sea-urchin is represented in the 

 present collection by only a single specimen. It is 11 mm, in 

 diameter, with the abactinal system 3I/2 mm. across, and ocular I 

 nearly or quite insert. A few of the aetinal spines show traces 

 of red. The periproctal plates are light apple-green, but else- 

 where both test and spines are white or whitish. 



