116 BULLETIN 201, UNITED STATES NATIONAL MUSEUM 



Occurrence. — Japan : Albatross stations 4800, 2 adult males, 2 adult 

 females (type lot) ; 4862, 1 male; 5030, 14 males, 13 females, 2 im- 

 mature. 



Distribution. — Known only from the present records from deep 

 water off the east coasts of Korea and Japan. 



Remarks. — This new species is remarkably similar to M. robusta, 

 and apart from the points noted its characters are so very much the 

 same as those of the latter species that the figures given by Sars and 

 Smith for M. robusta will suffice for M. microphthalma. I give a 

 figure of the telson (fig. 36, c) of the new species merely to emphasize 

 the similarity of the two forms. The most conspicuous difference 

 between the two forms is in the size of the eye. The difference is most 

 marked even to the naked eye, and it may be correlated with depth, 

 M. microphthalmia living in deeper water, 200 to 1,000 fathoms, as 

 against a maximum depth of 130 fathoms recorded for M. robusta, 

 off Norway. The tubercle of the eyestalk of M. microphthalmia may 

 be a compensatory sensory development for the reduction in the size 

 of the eye. 



Genus METAMBLYOPS Tattersall 



Hetaniblyops Tattersall, 1907, p. 106. 



METAMBLYOPS MACROPS Tattersall 



Figubes 37, 38 



Metamblyops macrops Tattersall, 1937, p. 15, figs. 9, 10. 



Description. — I reproduce here the original description and figures 

 of this species. 



Carapace (fig. 37, a) hardly or not at all produced into a rostral 

 plate, leaving the whole of the eye stalks and eyes, the antennular and 

 antennal peduncles completely uncovered, front margin broadly and 

 evenly arcuate, anterolateral corners rounded. 



Eyes (fig. 37, a) relatively large and on enormous stalks; in lateral 

 view the cornea is large and globular, without papilla, pigment reddish 

 brown. 



Antennal scale (fig. 37, a) extending for one-quarter of its length 

 beyond the antennular peduncle, rather narrow, six times as long as 

 broad; terminal lobe extending some distance beyond the spine of 

 the outer margin, twice as long as broad, with a distal joint marked off 

 by a suture. 



Telson (fig. 37, b) narrowly triangular in shape, two and a half 

 times as long as broad at its base, apex rounded and entire, lateral 

 margins armed along the distal half with about 15 spines increasing 

 somewhat in length toward the apex (spines on the apex broken away 

 so that their exact arrangement cannot be established). 



