REPORT OF THE ECHINOIDEA—MORTENSEN 123 
plates No. 1 of the posterolateral interambulacra are seen to be ex- 
cluded from the peristome, while in affinis they are broadly in contact 
therewith. If this be correct, and a constant character, the identity of 
afinis with fragilis is unthinkable. But the type of H. fragilis (from 
Japan) is a-young specimen, only 16 mm. long, as yet without genital 
pores; and the second specimen (from the Arafura Sea, 28 fathoms) 
has not been more closely studied, so that we do not know its char- 
acters more exactly—and Clark himself was in doubt as to its identity 
with the type of H. fragilis. Thus it is impossible for the present to 
form a definite opinion of the relation between fragilis and affints and 
their possible identity. Another near relation of affinis appears to be 
the West Indian H. brachypetalus H. L. Clark. 
Family SPATANGIDAE 
Genus BRISSOPSIS L. Agassiz 
BRISSOPSIS SIMILIS, new species 
Localities —Station 5188, east of Negros (lat. 9°44’ N., long. 123°14’ 
E.); 364 meters; April 1, 1908. Eight young specimens in poor 
condition, mainly naked tests. 
Station 5201, south of Leyte (lat. 10°10’ N., long. 125°04’ E.) ; 1,014 
meters; April 10, 1908. One specimen (the type) in good condition. 
Station 5203, south of Leyte (lat. 9°58’ N., long. 125°08’ E.) ; 1,418 
meters; April 10,1908. One fragmentary specimen. 
Station 5350, Palawan Passage (lat. 10°47’ N., long. 118°29’ E.); 
942 meters; December 27, 1908. One small naked test. 
Station 5487, Panadn Island (lat. 10°03’ N., long. 125°03’ E.) ; 1,340 
meters; July 31, 1909. Five specimens, partly fragmentary. 
Station 5488, Panaén Island (lat. 10° N., long. 125°07’ E.); 1,418 
meters; July 31,1909. Four specimens, partly fragmentary. 
Station 5513, north of Mindanao (lat. 8°17’ N., long. 124°03’ E.) ; 
924 meters; August 7, 1909. One large specimen in good condition. 
Station 5527, near Bohol (lat. 9°22’ N., long. 123°43’ E.); 717 
meters; August 11,1909. ‘Two specimens in fair condition. 
Station 5529, near Bohol (lat. 9°24’ N., long. 123°40’ E.); 807 
meters; August 11, 1909. ‘Two specimens, cne nearly complete, the 
other badly broken. 
Type.—vU.S.N.M. No. E.7154, from station 5201. 
Description.—In the character of the petals this species closely 
resembles Brissopsis luzonica; but the profile of the test is charac- 
teristically different, much higher posteriorly than Juzonzca, and while 
in the latter species the posterior end of the test is vertical, in similis 
it slopes outward. Otherwise the outline of the test is similar in both 
species, and the size is about the same; the largest specimen is 66 
