
oe DULICHIID &. 
The inferior antennz are shorter than the superior, 
reaching scarcely to the extremity of the peduncle of the 
superior. The first pair of legs have the hand small, 
short, and oval, the palm being oblique and imperfectly 
defined. The second pair of legs are much larger than 
the first, and have the hand long, but not very broad. 
It is armed anteriorly and inferiorly with two long, 
straight teeth, directed forwards, the posterior being the 
longer. The finger is short, thick, and double-lobed 
upon the inner margin. The coxe of the second pair of 
legs are produced in front to a point. The caudal 
appendages are sub-equal, and the middle tail-piece is 
pointed, 
We first received this specimen from Mr. Gregor, of 
Macduff, who procured it from the Moray Frith, and 
subsequently from Dr. Walker, who took it in deep 
water between the rivers Dee and Mersey. 
The specimens received from Dr. Walker differ from 
the type of the species so much that we hesitated in con- 
sidering them identical. After full consideration, how- 
ever, we feel assured that the alteration of form is one of 
variation, dependent upon some altered conditions in the 
history of the animal. 
The specimens from the mouth of the Dee have the 
hand of the second pair of legs shorter, stouter, and more 
oval than in the type, but the armature is the same, except 
that the inferior tooth is not quite so far behind the 
first, and not directed so straight forwards. 
One of these specimens was a female, and, fortunately, 
the larva were in a mature condition, which enabled us 
to ascertain that the absorption of the seventh into the 
sixth segment is a feature from the earliest existence of 
the animal. The larva is distinguishable from the adult 
by the shortness of the antenna, the small sizes of the 
hands, and the shortness of the last pair of legs. 
