REPORT OF THE ECHINOIDEA—MORTENSEN tat 
It is evident that this specimen is related to the Hawaiian Spatangus 
paucituberculatus A. Agassiz and H. L. Clark (cf. H. L. Clark, 
Hawaiian and other Pacific Echini, Echinoneidae . . . Spatangidae, 
p. 237, pl. 157, figs. 7-9). As in that species (and in the Mediter- 
ranean species S. inermis Mortensen) the paired interambulacra have 
no large tubercles aborally, there being only a very few larger tubercles 
along the midline of the posterior interambulacrum. It differs from 
the Hawaiian species in having the frontal depression much deeper, 
and the outline of the test not nearly circular, but distinctly narrow- 
ing toward the anterior end. The characters of the oral side seem 
to be as in paucituberculatus (so far as may be concluded from the 
description and the rather unsatisfactory fig. 9, pl. 157). There are 
only 2 pore-pairs to each side within the subanal fasciole. 
It is quite probable that we have here a new species of the genus 
Spatangus, but in view of the deficient condition of the single speci- 
men at hand I prefer not to name it, particularly in view of the un- 
certainty of the specific value of the character of the total absence of 
larger tubercles in the paired interambulacra. I have a couple of 
specimens from off Nagasaki, Japan, which would seem to be identical 
with Spatangus pallidus H. L. Clark, but here again the lateral 
interambulacra have no large tubercles at all. The study of the fossil 
forms of Spatangus also indicates that the character of the absence 
or the presence of a very few larger tubercles in the lateral inter- 
ambulacra is of no great value. 
Unfortunately the two Japanese specimens are likewise very in- 
complete, the oral side badly broken in one, totally lacking in the 
other specimen. A couple of specimens from the Kei Islands, like- 
wise with larger tubercles only along the midline of the posterior 
interambulacrum, and very probably identical with the specimen from 
the Albatross, are also very incomplete, naked tests. 
Till new, better-preserved specimens become available it must re- 
main undecided which species of the genus Spatangus it is that occurs 
in the Malay region. 
Genus MARETIA Gray 
MARETIA PLANULATA (Lamarck) 
Maretia planulata A. AcAssiz, Revision of the Echini, pp. 140, 570, pl. 19b, figs. 
7-17, 1873.—pE Merserr, Siboga Echinoidea, p. 190, pl. 23, figs. 478, 479, 
1904.—KoEHLER, Echinoderma of the Indian Museum, Echinoidea, pt. 1, 
Spatangidés, p. 106, pl. 11, figs. 18, 19; pl. 20, figs. 8-13, 1914. 
Maretia ovata H. L. Crark, Hawaiian and other Pacific Echini, Echinoneidae ... 
Spatangidae, p. 248, 1917; Catalogue of the Recent sea-urchins in the British 
Museum, p. 226, 1925. 
Localities—Tubig Bay, shore; January 7, 1908. Three specimens. 
Olongapé, Luzén, beach; January 7, 1908. Many small dark 
specimens. 
