REPORT OF THE ECHINOIDEA—-MORTENSEN 115 
Station 5460 (lat. 13°32’ N., long. 123°58’ E.) ; 1,034 meters; June 9, 
1909. One specimen. 
Station 5508 (lat. 8°17’ N., long. 124°12’ E.) ; 494 meters; August 
5, 1909. One specimen. 
Station 5657 (lat. 3°20’ S., long. 120°36’ E.) ; 900 meters; December 
19, 1909. One specimen. 
Station 5658, Gulf of Boni (lat. 3°33’ S., long. 120°31’ E.) ; 933 
meters; December 19, 1909. Five specimens. 
Remarks.—All these specimens, except the one from station 5508, 
were badly broken (particularly those from station 5658, very badly 
crushed), but it was possible to glue the fragments together so as to 
form fairly complete specimens, especially the largest one. The 
specimen from station 5508 has the oral side complete, only the labrum 
being broken, and thus gives important information about the charac- 
ters of the oral side, hitherto incompletely known. It is of great 
interest that the plates 6-8 of the ambulacral series adjoining the 
sternum are adproctally prolonged, the plates 7 and 8 having their 
pores at their adproctal end. This indicates that a subanal fasciole is 
typically present in this species, even though it is obliterated in the 
adult; it will be sure to be present in the young specimens. But it is 
herewith made evident that this species has nothing to do with 
Palaeopneustes, the genotype of which, P. cristatus (A. Agassiz), has 
no trace of a subanal fasciole even in the youngest specimens, and no 
adproctal prolongation of the adjoining ambulacral plates (as also 
the pedicellariae are very different from those of the present species). 
There can be no doubt that this species belongs to the genus Lino- 
pneustes, being very closely related to the genotype of that genus, L. 
murrayt (A. Agassiz). 
The specimen from station 5657 is a very large one, 160 mm. long, 
135 mm. broad, and 115 mm. high. This is thus by far the largest on 
record; the largest specimen from the Siboga was 113 mm. long. The 
smallest of the A/batross specimens is 115 mm. long. 
LINOPNEUSTES SPECTABILIS (de Meijere) 
Palaeopneustes spectabilis DE MEWERE, Siboga Wchinoidea, p. 172, pl. 8, figs. 86-90; 
pl. 21, figs. 422-426, 1904——H. L. CriarK, Hawaiian and other Pacific Echini, 
Echinoneidae . . . Spatangidae, p. 145, 1917. 
Linopneustes spectabilis WKoruirr, HEehinoderma of the Indian Museum, 
Eehinoidea, pt. 1, Spatangidés, p. 62, pl. 5, figs. 3, 6; pl. 11, figs. 7, 8; pl. 17, 
figs. 36-51, 1914. 
Localities —Station 5491 (lat. 9°24’ N., long. 125°12’ E.); 1,347 
meters; August 1, 1909. One young specimen, fairly complete. 
Station 5492 (lat. 9°13’ N., long. 125°20’ E.) ; 1,345 meters; August 
1,1909. Four more or less fragmentary specimens, the largest 90 mm. 
long. 
