392 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Albatross station 5428; Eastern Palawan and vicinity; 30th of 

 June Island bearing N. 62 W., 36.14 kilometers (19.5 miles) dis- 

 tant (lat. 9 13' 00" N., long. 118 51' 15" E.) ; 2,021 meters (1,105 

 fathoms) ; April 3, 1909 ; gy. M. 



One specimen (Cat. No. 40998, U.S.N.M.). 



Albatross station 5605; Gulf of Tomini, Celebes; Dodepo Island 

 (W.) bearing N. 14 W., 10.93 kilometers (5.9 miles) distant (lat. 

 21' 23" N., long. 121 34' 10" E.) ; 1,183 meters (647 fathoms) ; 

 November 16, 1909. 



One specimen (Cat. No. 41000, U.S.N.M.). 



Albatross station 5623; between Gillolo and Makyan Islands; 

 Makyan Island (S.) bearing S. 88 W., 13.90 kilometers (7.5 miles) 

 distant (lat. 16' 30" N., long. 127 30' 00" E.) ; 497 meters (272 

 fathoms) ; November 29, 1909; fne. S., M. 



Eight specimens (Cat. No. 40999, U.S.N.M.). 



Albatross station 5624 ; between Gillolo and Makyan Islands ; Mak- 

 yan Island (S.) bearing N. 67 W., 16.49 kilometers (8.9 miles) dis- 

 tant (lat. 12' 15" N., long. 127 29' 30" E.) ; 527 meters (288 

 fathoms) ; November 29, 1909; fne. S., M. 



One specimen (Cat. No. 40996, 'iJ.S.N.M.). 



Notes. The specimens from the three first stations are the smallest, 

 and the diameter of the disk scarcely exceeds 10 mm. ; in those from 

 station 5623 the diameter of the disk varies between 10 and 18 mm. ; 

 this last dimension is also found in the single example from sta- 

 tion 5624. 



In these different specimens I find some interesting variations. I 

 may recall that the principal characters on which I established the 

 species in 1896 are the form of the mouth shields, the existence of 

 small radial papillae outside of the radial shields, papillae which are 

 continued over the two borders of the genital slits, the presence of 

 three pairs of tentacle pores, and the arrangement of the dorsal 

 plates of the disk. My original specimens, three in number, came 

 from the Laccadive and Andaman Islands, and the diameter of their 

 disks varied between 11 and 13 mm. The series collected by the Al- 

 batross is more numerous, and includes larger specimens, the diameter 

 of the disk reaching 18 mm. I show on plate 83, as figures 5, 6, the 

 two surfaces of a large sized specimen from station 5623; and in 

 figure 9 the ventral surface of the specimen from station 5624, 

 which has the same dimensions. Two smaller individuals, from sta- 

 tions 5428 and 5127, in which the diameter of the disk is only be- 

 tween 10 and 11 mm., are shown in figures 1, 2. 



In the dorsal plates of the disk I do not find any important differ- 

 ences; on the small individuals I always notice in the interradial 

 spaces the three large tandem plates, which I showed in 1896 (fig. 2),, 

 but in the large ones there are only two plates (fig. 5). In these- 



