MUSEUM OF COMPARATIVE ZOOLOGY. 



Trigonocidaris albida A. Ao. 



Echinus norvegicus Dub. o. Kor. 



It seems almost hopeless to attempt to distinguisli the species of Echinus known 

 as E. elegatis, E. norcegicus, E. melo, and E. Flemingii. AVhile the specimens 

 from the same localities usually vary but little, those of adjoining or distant locali- 

 ties vary to such an extent that they generally combine more or less the specilic 

 features by which we have become accustomed to separate the above-named 

 species. 



A large series of £". norvegicus from 1241 fathoms shows but the slightest possi- 

 ble variation among the different individuals, yet they all have the anal system 

 which thus far has been considered characteristic of E. elegans. 



The largest specimens I have seen of this species were collected by the " Por- 

 cupine," but they differ in no marked way from the typical E. norvegicus. 



This species was very common in 1241 fathoms. 



Station 308. 1242 fathoms. Lat. 41° 24' 45" N., Long. 65° 35' 30" W. 



" 341. 1241 " " 39° 38' 20" N., " 70° 56' 0" W. 



Echinus Wallisi A. Ao. n. sp. 



This is a large species allied to E. Flemingii and E. elegans. The test is 

 somewhat depressed. It is readily distinguished by the close secondary tubercu- 

 lation surrounding tlie primary tubercles, by tiie arrangement of the pairs of pores 

 in sets of two. Tlie primary spines are long and sharp, like those of E. Flemingii. 

 The anal system is intermediate in size between that of E. Flemingii and that of 

 E. elegans. When alive it was of a brilliant dark reddish pink color, the test of a 

 darker shade than the spines ; these arc darkest at the base and pinkish at the tip. 

 The smallest specimen collected measured about half an inch. A fine large 

 specimen of this species, measuring three and a half inches in diameter, was 

 collected. It has also been found off Newport by the U. S. Fish Commission. 



Station 306. 524 fathoms. Lat. 41° 32' 50" N., Long. 65° 55' W. 



" 309. 304 " " 40° 11' 40" N., " 68° 22' W. 



" 320. 257 " " 32° 33' 15" N., " 77° 30' 10" W. 



" 330. 1047 " " 31° 41' 0" N., " 74° 35' 0" W. 



Also from Station 330, 1047 fathoms, fragments of a large Echinus of a dark 

 violet color, with close tuberculation and long slender spines, with a low test, which 

 I am unable to refer to any of the known species of the genus. 



