176 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Ljungman's type was captured in deep water between Batavia and 

 Singapore. 



AMPHIOPLUS LUCIDUS, new species. 



Plate 68, figs. 6-10 ; plate 96, fig. 10. 



Localities. — Albatross station 5161; Sulu (Jolo) Archipelago, Tawi 

 Tawi Group; Tinakta Island (E.) bearing N. 12° W., 3.33 kilometers 

 (1.8 miles) distant (lat. 5° 10' 15" N., long. 119° 53' 00" E., 29 

 meters (16 fathoms) ; February 22, 1908; fne. S., blk. Sp. 



Two specimens (Cat. No. 41127, U.S.N.M.). 



Albatross station 5371; Marinduque Island and vicinity; Tayabas 

 Light (outer) bearing N. 43° W., 11.1 kilometers (6 miles) distant 

 (lat. 13° 49' 40" N., long. 121° 40' 15" E.) ; 152 meters (83 fathoms) ; 

 February 24, 1909; gn. M. (m. b.). 



One specimen (Cat. No. 41126, U.fe.JN.M.). 



Description. — All the specimens are incomplete ; the dorsal surface 

 of the disk is torn off, and the arms are not preserved for their whole 

 length. In the specimen from station 5371, which is the largest, the 

 portion of the disk which remains has a diameter of 3.5 mm., and the 

 arms are preserved for a fairly long distance ; one of them measures 

 90 mm., and the width remains the same for all this length ; it is cer- 

 tain that these arms were extremely long. I shall describe this species 

 more especially from this specimen, but as the radial shields have 

 not quite the same form as in those from station 5161, I shall also 

 give the characters of these as found in the latter. 



In the specimen from station 5371 (pi. 68, fig. 9) the mouth shields 

 are much elongated and relatively narrow ; they are twice as long as 

 broad, quadrangular, with a narrow and very strongly rounded proxi- 

 mal border, a broader and also rounded distal border, and straight or 

 very slightly concave and slightly divergent sides. In the two speci- 

 mens from station 5161, of which I give photographs in figures 6 and 7, 

 it may be seen that the mouth shields may become markedly broader, 

 and their form even somewhat different in these two specimens ; they 

 are, however, always longer than broad. But in the specimen shown 

 in figure 7 two of these shields become cordiform ; they show a major 

 triangular portion of which the angles are rounded, and a distal lobe 

 which is as long as broad; while in the other shields this lobe is 

 merged with the principal portion of the plate, which, as a whole, is 

 lozenge-shaped with the sides rounded and the distal angle truncated 

 (two of the shields appear shorter in my photograph because they are 

 seen foreshortened). The adoral plates, which are of medium size, 

 are triangular, tapering inwardly, but contiguous in the median in- 

 terradial line by a very narrow border ; they are broadened outwardly 

 and separate the mouth shield from the first side arm plate. The 

 oral plates are rather large, twice as high as broad. The mouth 



