8 Messrs. E. W. E. Holt awl W . M. Tattersall on 



Fam. Mysidae. 

 Genus Pseudo.mmAj G. O. Sars. 



Pseudontina Belgicce, Hansen (MS.). 



Form as usual in the genus. Carapace with the cervical 

 sulcus well marked, evenly rounded in front, emarginate 

 behind so as .to expose the last thoraeio segment. Fleon 

 longer than the carapace, first five segments subequal in 

 length, sixth about twice as long as the fifth. Eye-plates 

 contiguous, slightly cleft in the median line, subquadrangu- 

 lar in shape, extending not quite to the end of the basal 

 joint of the antennule, margins quite smooth, without teeth 

 or armature of any kind. Antennal scale about three and a 

 half times as long as broad, its apex extending very slightly 

 beyond the terminal spine of the outer margin. Mouth-parts 

 and thoracic Uml>s not differing in any salient point from tliose 

 of P. roseinn. Telson slightly shorter than the last segment 

 of the pleon ; apex evenly rounded, armed with four pairs of 

 smooth spines, the inner pair about one sixth of the length 

 of the telson, median setse present ; lateral margins armed 

 along their distal halves with about five spines. Inner 

 tiro/iod about half as long again as the telson. Outer uropod 

 about twice the length of the telson. 



Length of an adult female 23 mm.'^ 



Localitii. Lat. 78° 25' 40" S., long. ir)5° 39' 6" E., one 

 specimen. 



This species is very closely allied to P. Sarsi described by 

 ^Vill.-Suhm from Kerguelen f. It differs, however, in two 

 points : (i.) in having the eye-piates quite smooth, whereas 

 in P. <SV//\s? they are toothed at their antero-lateral corners ; 

 (ii.) in having only four pairs of spines at the apex of the 

 telson, which is more evenly rounded than in P. Sarsi. 

 P. Belgicce is, moreover, much larger than P. Sarsi, the type 

 of which, a female with ovigerous lamellae well developed, 

 measures only 14 mm. Minor differences in the shape of 

 the antennal scale may also be noticed. 



(ienus Dactylamblyops, nov. 



Characters generally as in Amblyops, G. O. Sars, except : — 

 Eyes more or less pyriform in shape, not flattened, placed 



* Dr. Hansen has shown uslnrger specimens. 



t S.ee G. O. Sars, "^V)yage H.M.S. ' Challenger' : Keport on Schlzo- 

 poda," Zonl. vol. xiii. 



