196 MR. GEORGE HODGE ON 
the palpi; Ammothoa possessing eight,* whilst Mymphon has 
only five. The foot-jaws in Nymphon are always as long or 
longer than the rostrum: in Ammothoa they are much shorter. 
I have two new species to describe, for which the specific 
names of brevipes and longipes are proposed. 
Ammothoa brevipes Hodge). Plate [V., Figs. 1-4. 
Limbs short and robust, furnished with moderately long 
strong spines. Rostrum conical, with the apex truncate. 
Foot-jaws nearly two-thirds the length of the rostrum : 
palpi equal in thickness throughout, if anything slightly 
thicker at the free end. Oculiferous tubercle terminating 
in a pointed wart directed backwards. Abdomen long, 
slightly tapering. Length >> inch. 
Several specimens have occurred on the Durham coast from 
deep water. 
Ammothoa longipes (Hodge). Plate IV., Figs. 5-6. 
Animal slender. Rostrum stout, as long as the thorax, 
tapering to a blunt point. Palpi long and slender, the 
four terminal joints of equal length. Foot-jaws long, 
fingers destitute of teeth. Oculiferous tubercle slightly 
tapering. Length 4, inch. 
A single specimen from Polperro. 
Achelia is distinguished by the possession of two pairs of 
palpi; one pair long and slender, the other short and stout. 
The genus may be thus characterized :— 
Antenne two-branched, one pair long and slender, eight- 
jointed; the other pair short and stout, two-jointed, and 
produced immediately in front of the oculiferous tubercle. 
In some respects this genus agrees with a form possessing two 
pairs of palpi, which Kroyer named Zetes ; it may, however, at 
once be distinguished by the very different character of the 
rostrum, that of Zetes being much elongated and seated upon a 
sort of stalk, and that of Achelia being short and stout. I have 
three species of this genus to describe, for which the specific 
names of echinata, hispida, and levis are proposed. 
* The foreign forms are said to possess nine. 
