NO. 26 NEW MYSIDACID CRUSTACEANS TATTERSALL 1 5 



of the type species, but the specimen is so imperfect that I cannot be 

 sure that they are really absent. The species is distinguished from the 

 other described forms by the combination of the characters of the 

 eye, antennal scale, and telson. The latter resembles very closely the 

 tels'on of Gibhcrythrops acanthura (IHig), but the eye and antennal 

 scale are very different from those of this species. In spite of the im- 

 perfect condition of the only specimen, I think that the species should 

 be easy to recognize from the characters given above. 



METAMBLYOPS Tattersall 

 METAMBLYOPS MACROPS, n. sp. 



Text figs. Q and 10 



Locality. — Serial number 573, one specimen, female. 

 Description.— Carapace (text fig. 9a) hardly or not at all produced 

 into a rostral plate, leaying the whole of the eyestalks and eyes, the 

 antennular and antennal appendages completely uncovered, front 

 margin broadly and evenly arcuate, anterolateral corners rounded. 



Eyes (text fig. 9a) relatively large and on enormous stalks ; in lateral 

 view the cornea is large and globular, without papillae, pigment red- 

 dish brown. 



Antennal scale (text fig. 9a) 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 (text fig. 9^) narrowly triangular in shape, two and one- 

 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 size toward the apex (spines on the apex broken away 

 so that their exact arrangement cannot be established). 



Uropods (text fig. 9&) both rather slender, inner one and one- 

 half times as long as the telson, with a single spine on the inner 

 margin in the region of the statocyst ; outer twice as long as the telson. 

 Length of an adult female, 11 mm. 

 Ty/'^.— U.S.N.M. no. 72870. 



The form of the endopods of the second and third thoracic hmbs 

 is shown in text figure loa and loh. They are of the typical Ery- 

 thropini form, rather long and slender, the sixth joint of the third 

 endopod divided by a proximal oblique and a distal transverse suture 

 into three subjoints. 



