REPORT OF THE ECHINOIDEA—MORTENSEN 95 
Order CASSIDULOIDA 
Family ECHINOLAMPADIDAE 
Genus ECHINOLAMPAS Gray 
ECHINOLAMPAS ALEXANDRI de Loriol 
Hechinolampas alexandri pe LorioLt, Mém. Soc. Hist. Nat. Genéve, vol. 24, p. 4, 
pl. 1, figs. 1-8, 1876.—H. L. Crark, Hawaiian and other Pacific HEchini: 
Hchinoneidae . . . Spatangidae, p. 114, pl. 144, figs. 14-16; pl. 153, figs. 3, 4, 
1917.—KoEuHteEr, HEchinoderma of the Indian Museum, Echinoidea, pt. 2, p. 
144, pl. 4, fig. 10, 1922.—H. L. Crarx, Catalogue of the Recent sea-urchins in 
the British Museum, p. 182, 1925. 
Remarks.—A single old, broken test, unfortunately without label, 
must, I think, be referred to #. alexandri, the characters of the petals, 
the coarse tuberculation, the broad transverse peristome, and the quite 
rudimentary floscelle conforming with this species. It would seem, 
then, that this species occurs also in the Malay region, though it has not 
till now been recorded from there. (The E'chinolampas depressa re- 
corded by de Meijere in his Siboga Echinoidea, p. 144, from off Saleyer 
is not that species but a close relative of H’chinolampas alexandri, a 
fact that has been mentioned in volume 4, part 1, of my Monograph of 
the Echinoidea.) 
Genus CONOLAMPAS A. Agassiz 
CONOLAMPAS DIOMEDEAE, new species 
Locality.—Station 5261, off Mindoro (lat. 12°30’55’’ N., long. 
121°34’24’’ KE.) ; 265 meters; June 4, 1908. One specimen. 
Type—vU.S.N.M. No. E.7147, from station 5261. 
Description.—The test is perfectly hemispherical, the apex being in 
the center; the oral side is perfectly flat, scarcely at all sunken in the 
middle and without any tumidity before the periproct. The outline is 
almost circular, only slightly ovoid, 70 mm. long, 66 mm. broad, the 
elongation hardly perceptible. The height is 33 mm., exactly half the 
breadth. 
The mouth is slightly posterior, 36 mm. from the anterior, 34 mm. 
from the posterior edge of the test, measured from the center of the 
mouth; it is rather small, 8 mm. wide. Periproct a little smaller, 
7 mm. wide, situated distinctly on the oral side. Apical system of the 
shape usual in E’chinolampas, it is slightly knob-shaped, placed almost 
exactly in the center. 
Ambulacra: The aboral poriferous areas, which are not at all 
petaloid, reach very nearly to the edge of the test. The anterior 
ambulacrum has 62 or 63 pore-pairs in both series; ambulacrum (IT 
and) IV has 68 pore-pairs in the anterior, 7% in the posterior series, 
