82 BULLETIN OF THE 



Paleopneustes hystrix A. Ag. n. sp. 



This species is more flattened than P. cristatux ; the ambulacral pores are more 

 distant, extending in nearly vertical rows, slightly and uniformly spreading tx)wards 

 the ambitus. The primary tubercles of the abactiual surface are not numerous; 

 they carry large, comparatively stout, slightly curved sharp primary radioles, 

 which, at first sight, give this Spatangoid the appearance of one of the regular 

 Sea-urchins. Tlie color of the test and of the spines is greenish purple, or a light 

 Indian red. The spines of the actinal surface are finer, spathiforni, and closely 

 packed, specially closely clustered round the anal system. There is no trace of a 

 marginal fasciole. 



Station \U. 21 fathoms. On Saba Bank. 



" 14S. 208 " Off St. Kitts. 



" 157. 120 " " Montserrat. 



" 166. 150 " " Guadeloupe. 



Linopneustes longispinus A. Ag. 

 Eupatagus longispinus A. Ag. Bull. M. C. Z., V. no. 9. 



In the Preliminary Report of the Echini of the "Blake" Expedition for 1877- 

 78, I noticed under the name of Eupataffus longispinus fragments of a large 

 Spatangoid too imperfectly preserved for accurate generic determination. A 

 number of specimens of this fine species were collected, and I am now able to 

 say that it belongs to the subgenus Linopneustes (Paleopneustes), and is most 

 closely allied to Linopneustes Murrayi. 



It can at once be distinguished from it by the great flatness of the test, the 

 nearly closed lateral petaloid ambulacra, about half-way from the apical system, and 

 the simple rows of pores spreading far apart at the ambitus. The primal^ tuber- 

 cles are distant ; on the abactinal surface they carry long, stout, curved primary 

 radioles of a whitish silvery lustre, with yellowish tint. The color of the test is 

 pinkish or flesh-color. The subanal fasciole is small, transversely elliptical ; the 

 marginal fasciole is of a dark color, extends a very short distance above the ambi- 

 tus along the whole outline of the test, and crosses the posterior extremity above 

 the anal system. 



The spines of the actinal surface are much finer and shorter tlian those of the 

 abactinal side. The ambulacral areas are broad, bare ; the actinal plastron is 

 small. Large specimens measure nearly four inches in length. 



