CURIOUS EYES 269 
Southern Ocean, in 1,950 fathoms, at latitude 53° 55’ south, 
but afterwards it was taken at a depth of 1,110 fathoms, 
north-west of Finmark, by the Norwegian North Atlantic 
Expedition. This is one of the instances in which a species 
has only been found far to the north and far to the south, 
yet it seems hasty to infer that such species will not in 
time be discovered in many intermediate localities. Boreo- 
mysis scyphops is gigantic for a Mysidan, attaining a length 
of more than three inches. In this genus there are seven 
pairs of marsupial plates, which are attached to the second 
maxillipeds and the following limbs. Apparently all the 
rest of the Mysidz are content with a much smaller num- 
ber of incubatory lamelle. Boreomysis is without the 
abnormal characters of the male found in Petalophthalinus, 
and it has the telson apically incised. 
Amblyopsis was altered into Amblyops by Sars in 1872. 
The name has reference to the character of the eyes, which 
are ‘imperfectly developed, transformed into two immobile 
plates, extending horizontally in front of the carapace and 
contiguous in the middle.’ There are only two species, 
the Norwegian Amblyopsis abbreviata, and from the 
Southern Ocean Amblyopsis crozetii. In this genus the 
legs are tolerably strong, having the sixth joint subdivided 
into three articulations, and the terminal joint unguiform ; 
the telson is not incised at the apex. 
Pseudomma has the ‘eyes quite rudimentary, forming 
merely broad petaloid expansions of the ocular segment, 
partly connate in the middle, and not exhibiting the slightest 
trace of pigment or visual elements.’ Here the legs are 
exceedingly slender, the sixth joint subdivided as in the 
preceding genus, but the terminal joint obtuse, not ungui- 
form. The telson is not incised. Three northern and two 
southern species have been described, Pseudomma trunca- 
tum, S. I. Smith, being arctic, and Pseudomma Sarsii, v. 
Willemoes Suhm, antarctic. 
Mysis, as understood prior to the recent restriction of 
the genus, has the sixth joint of the trunk-legs subdivided, 
and the fourth pair of pleopods in the male developed into 
long backward-directed stilets, the third pair being also 
