264 
GAMMA RIDiE. 
rather obtuse, and the last is so broad at the base that it 
assumes more the appearance of a hump than a tooth. 
The eyes are large, reniform, and of a red-orange colour. 
The superior pair of antennae are more robust than the 
inferior, and we presume that they are longer, but the 
flagellum is mutilated in our unique specimen. The 
articuli of the flagellum are very short, and except the 
first all are shorter than broad, each supporting on the 
inferior surface a few hairs and an auditory cilium. The 
inferior antennae are about one-fourth of the length of 
the animal, and have the olfactory process extremely 
long. The maxillipeds have the sixth joint anteriorly 
produced nearly as long as the finger, which is very long 
and slender. The first pair of legs have the hand small, 
and but slightly dilated ; they are ovate, with the palm 
oblique. The second pair have the hand large, increas- 
ing in width to the palm ; the inferior margin being 
straight, while the superior is arcuate, especially towards 
the wrist. The palm is concave, not oblique, defined by 
two or three small cusps on the inferior angle, and 
furnished with several stout blunt spines. All the 
walking legs are short, stout, nearly of the same length, 
and furnished upon the inner margin with short blunt 
spines, subapically tipped with a single cilium. The 
caudal appendages reach nearly to an equal extent, and 
the branches are furnished, on the posterior margins, with 
short spinules. 
The animal, after being placed in spirits, is straw- 
coloured, except the eyes and the posterior segment of 
the tail, which are tinted with a blush of red. We have 
only seen one specimen, which was taken by Mr. J. Gwynn 
Jeffreys, during the last summer, off the Shetland Islands. 
