REPORT ON THE ECHINOIDEA—MORTENSEN 19 
figs. 153-157, 1904.—MortTEnsen, Monograph of the Echinoidea, vol. 2, p. 246, 
pl. 36; pl. 37; pl. 38, figs. 1, 2; pl. 39; pl. 81, figs. 1-22, 1935. 
Localities —Station 5135; in the vicinity of Jolo (Sulu); Jolo 
Light bearing S. 46° W., 11.9 miles distant (lat. 6°1150’ N., long. 
121°08’20’’ BE.) ; 294 meters; bottom temperature 14.17° C.; fine coral 
sand; February 7, 1908. Two specimens. 
Station 5445; eastern coast of Luzon; Atalaya Point, Batag Island, 
bearing S. 56° E., 5.38 miles distant (lat. 12°44’42’’ N., long. 
124°59’50”’ E.) ; 700 meters; bottom temperature 6.83° C.; green mud 
and sand; June 3, 1909. One specimen. 
Station 5452; off the east coast of Luzon; Legaspi Light bearing 
S. 38° W., 3 miles distant (lat. 18°11’54”” N., long. 123°47’10’’ E.) ; 
201 meters; June 7, 1909. One specimen. 
Station 5565; between Jolo (Sulu) and Tawi Tawi; Dammi Island 
(N.) bearing S. 69° W., 6 miles distant (lat. 5°51’42’’ N., long. 
120°30’30’" E.); 444 meters; bottom temperature 11.28° C.; sand 
and pteropod shells; September 21, 1909. One specimen. 
Remarks.—The specimen from station 5445 is a small one, 45 mm. 
in diameter. Only very few pedicellariae, of the small tridentate 
and the triphyllous forms, are preserved, and all the primary spines 
are broken. But it is in general so very like some specimens of cor- 
responding size from off Zamboanga that I dredged in 1914, which 
are certainly referable to A. tessellatum, that I can have no doubt that 
this specimen also is a young A. tessellatum. 
ARAEOSOMA TESSELLATUM var. CARINATUM Mortensen 
Araeosoma tessellatum, var. carinatum MORTENSEN, Vid. Medd. Dansk Naturh. 
Foren., vol. 98, p. 163, 1984; Monograph of the Echinoidea, vol. 2, p. 250, 
pl. 40, figs. 1, 2; pl. 81, fig. 28, 1935. 
Locality —Station 5290; China Sea, in the vicinity of southern 
Luzon; Matocot Point bearing S. 50° E., 3.1 miles distant (lat. 
13°40'09” N., long. 120°59’30’ E.); 391 meters; lava and gravel; 
July 22, 1908. Two specimens. 
Remarks.—It is quite probable that these specimens rather repre- 
sent a separate species, but from the material available this can 
scarcely be decided. The peristomial plates and the ambulacral 
plates of the oral side are more numerous than in the typical fessel- 
latum, but there are transitions in this regard. The only reliable 
difference appears to be the existence of a longitudinal keel in the 
valves of the small tridentate pedicellariae, such a keel not being 
found in typical tessellatum. But this would seem too unimportant 
for a species character. Dactylous pedicellariae were not found. It 
will then be preferable for the present to designate this form only 
as a variety of A. tessellatwm. 
