REPORT OF THE ECHINOIDEA—MORTENSEN ae 
Genus HOMOLAMPAS A. Agassiz 
HOMOLAMPAS LOVENIOIDES, new species 
Locality.—Station 5650, Gulf of Boni (lat. 4°54’ S., long. 121°29’ 
E.) ; 988 meters; December 17, 1909; two specimens. 
Type.—U.S.N.M. No. E.7150, from station 5650. 
Description—The two specimens are of the same size, 31 mm. long, 
25 mm. broad, and 16 mm. high; but they differ somewhat in shape, 
one of them, the holotype, having the greatest width more anteriorly 
than the other, the paratype; also the test rises in the type more sharply 
from the anterior edge toward the apical system than in the paratype. 
In general the shape of the test resembles that of Zomolampas fragilis, 
only the sides rise less steeply toward the apical system than in ZH. 
fragilés. Although the test is very fragile, the two specimens are in 
fair condition, parsioularly the type specimen. 
In the characters of the ambulacra and inter amnbnlacrs this new 
species very closely resembles H. fragilis, it is of particular importance 
that there are no primary spines in the odd posterior interambulacrum. 
The labrum appears to offer a good distinguishing character, its pos- 
terior prolongation reaching in the new species to the middle of plate 
3 of the adjoining ambulacra, not beyond plate 2 in H. fragilis. The 
number of genital pores is four in the type, three in the paratype; it 
is thus impossible to tell what is the normal number of the genital 
pores. There is no trace of a peripetalous fasciole (likewise lacking in 
H. fragilis) ; the subanal fasciole appears to be somewhat broader 
(three times as broad as long) in the present species than in H. 
fragilis (twice as broad as long). The primary aboral spines are 
(so far as preserved) unilaterally serrate (as in fragilis) ; the spines 
of the plastron are conspicuously serrate along the convex side. There 
are three tube feet to each side within the subanal fasciole. The 
pedicellariae are, as in HZ. fragilis, of the five usual types, globiferous, 
tridentate, rostrate, ophicephalous, and triphyllous. The globiferous 
pedicellariae, which are found only on the aboral side, between the 
secondary spines, have the valves terminating in one or two long teeth. 
On the whole the pedicellariae are very much like those of H. fragilis, 
only the valves of the rostrate pedicellariae are somewhat slenderer. 
The color is white. 
Remarks.—This species so closely resembles the West Indian Homo- 
lampas fragilis that were they found together they would probably 
be regarded as the same species; but since one is known only from the 
West Indies and the mid-Atlantic and the other only from the Malay 
region, they must be regarded as distinct species, at least so long as 
they are not known from intermediate localities (South Atlantic; 
Indian Ocean) 
