MUSEUM OF COMPARATIVE ZOOLOGY. 7 
Trigonocidaris albida A. Aa. 
Station 100. 250-400 fathoms. Off Morro Light. 
Tate ORs 124 i © St. Vincent. 
SURE 988 42 “ Barbados. 
“299, 1 ^ “ 
Echinus norvegicus D». o. Kom. 
It seems almost hopeless to attempt to distinguish the species of Echinus known 
as £. elegans, E. norvegicus, E. melo, and E. Flemingü. While 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 specific 
features by which we have become accustomed to separate the above-named 
species. 
A large series of Æ. 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 Æ. 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 Æ. norvegicus. 
This species was very common in 1241 fathoms. 
Station 308. 1242 fathoms. Lat. 41° 24’ 45" N., Long. 65° 35’ 30" W. 
“ adl. 1941  “ ADA DONI กู ร ถู ห ห, 
Echinus Wallisi A. Ac. n. sp. 
This is a large species allied to X. Flemingii and E. elegans. The test is 
somewhat depressed. It is readily distinguished by the close secondary tubercu- 
-lation surrounding the primary tubercles, by the arrangement of the pairs of pores 
in sets of two. The primary spines are long and sharp, like those of Z. Flemingii. 
The anal system is intermediate in size between that of ZZ Flemingii and that of 
FH. elegans. When alive it was of a brilliant dark reddish pink color, the test of a 
darker shade than the spines; these are 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. 
a NUM. 804  ** Cad 0*1] BOM A 99^ W, 
~ OSORU Bor S 3109 O8 LO" Nipro 779 807 107 W. 
"OB, แป ล 6 o a LON optó 749 880 07 Y. 
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 
Iam unable to refer to any of the known species of the genus, 
