CRUSTACEA. 
495 
Nebalia Herbstii —Herbst’s Nebalia. 
Plate XCV. fig. 2. 
Ash-coloured, with black eyes. One inch long. Inhabits 
the European seas. 
ORDER II.—STOMAPODA. 
The head is large, and distinct from the trunk, and consists 
of two parts; the branchiae are in the form of plumes or tufts, 
adhering to the lower appendages of the post-abdomen; inter¬ 
mediate antennae with a filamentous termination ; shell mem¬ 
branaceous ; six posterior feet filiform ; extremity of the body 
provided with a foliaceous fin. 
TRIBE I.-UNIPELTATA. 
With a narrow elongated body; intermediate antennae and 
eyes seated on an elongation of the thorax; exterior feet-jaws 
and four anterior feet terminated in a monodactyle forceps, of 
which the moveable hook is formed by the tarsus ; the other six 
feet are constructed for swimming, with the last joint brush¬ 
shaped ; lateral antennas having a scale at the base, and the in¬ 
termediate ones terminated by three filamentary processes. 
This tribe contains three genera: 1. Squilla ; 2. Erichthus; 
3. Alima. 
TRIBE II.-BIPELTATA. 
Body depressed, membranous and diaphanous ; thorax divided 
into two shields ; the front one very large, ovate, the second 
supporting the feet-jaws, together with five pairs of feet, which 
are filiform ; intermediate antennse provided with two filaments. 
There is but one genus of this tribe : 4. Phyllosoma. 
ORDER III.—l.t:modipoda. 
Head and first segment of the trunk not distinctly divided ; 
with four setaceous antennee, having many articulations ; second 
and third segment provided below with vesicular bodies, sup¬ 
posed to be the organs of respiration. 
2 s 2 
