TRANSACTIONS OF THE SECTIONS. 108 
The genus Armmothoa is in some respects like Nymphon, the most decided dif- 
ference being the greater number of joints of the palpi, Ammothoa possessing eight, 
whilst Nymphon 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. 
he limbs of Ammothoa brevipes are short and robust, furnished with moderately 
long, strong spines. The rostrum is conical, with the apex truncate; the foot- 
jaws nearly two-thirds the length of the rostrum ; palpi equal in thickness through- 
out,—if anything, slightly thicker at the free end. Oculiferous tubercle terminating 
in a pointed wart, directed backwards. Abdomen long, slightly tapering. 
Several specimens have occurred on the Durham coast, from deep water. 
Ammothoa longipes is more slender in general form than Ammothoa brevipes. The 
rostrum is as long as the thorax, tapering to a moderately blunt point. The palpi 
are long and slender, the four terminal joints being of about equal length. 
A single specimen from Polperro. 
Acheliu 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 iennedliately in front of the ocu- 
liferous 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, Zetes being much elongated and seated upon a 
sort of stalk, 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. 
Achelva echinata is robust, with moderately long legs, furnished with strong spines 
produced from little eminences upon the limbs and hady. The oculiferous tubercle 
is directed forwards, and terminates in a little point, directed backwards. The 
inner = are of the same length as the oculiferous tubercle, the outer being longer 
than the rostrum. The colour is a fine sienna to a pale straw. 
This species has been found in the Channel Islands, the Isle of Man, and upon 
the Durham coast. Itis by no means uncommon, from low tide to a few fathoms. 
Achelia hispida is distinguished from Achelia echinata by the much smaller di- 
mensions of the spines, which, in this species, are mere hairs, and also by the rela- 
tive sizes of the inner palpi and oculiferous tubercle ; the latter organ reaches but a 
little beyond the origin of the inner palpi, which are robust and furnished with two 
circlets of little spines ranged round the upper and lower ends of the first joint. 
Achelia levis is remarkably free from hairs, merely possessing a few small ones on 
the femoral and tarsal joints. The oculiferous tubercle is much shorter than either 
of the preceding, the inner palpi more closely resembling those of Achelia echinata. 
The two latter species were sent me from Polperro, in Cornwall. 
The rostrum of Phoxichilidium virescens is stout, slightly thickened in the middle, 
truncate at the apex. The foot-jaws are slender and closely approximated at their 
origin, each finger with 6-8 teeth. Legs moderately long. Colour pea-green. 
everal specimens of this species were sent me from Polperro. 
At first sight it might be mistaken for Phovichilidium olivaceum, but the closely 
approximated foot-jaws at once show its distinct character. 
allene pygmea was taken by Mr. Spence Bate so far back as 1853, and by him 
noticed in a paper of that year read before this Association at Hull. It was, how- 
ever, neither named nor described, his remarks bearing upon the larval stages of 
these animals. I have also taken a single specimen upon the Durham coast; it 
may be thus characterized— 
Thorax robust ; legs long and slender, constricted at the joints; last joint fal- 
ciform, with a strong toothed shoulder at the base. Two strong spines on the 
sixth joint. Rostrum short, stout. Foot-jaws closely approximated. Oculi- 
ferous tubercle moderately long. Abdomen stout. 
The three species new to Britain all belong to the genus Nymphon. They were 
described by Kroyer in Gaimard’s ‘Scandinavian Voyage.’ One species, Nymphon 
