107 
does not make clear what he means by saying that the thoracic 
feet in Ephyra appear not to have any point. Apart from this 
obscurity the definition contains nothing antagonistic to 
Acanthephyra. 
It may be worth noting that the reference which Bate gives 
for Acanthephyra purpurea, A. Milne-Edwards, the first re- 
corded abysmal species of the genus, is erroneous. Instead of 
“ Comptes rendus, t.xcii. p. 1396, 1881,” the volume should be 
XCIII., and the page 933. 
Acanthephyra batei, n. Sp. 
Plate XXIVB. 
This form must take its place in a group of closely-related 
species, A. purpurea, A. Milne-Edwards, A. agassizi, S. I. 
Smith, A. sica, Bate, A. sanguinea, Wood-Mason and Alcock, 
A. acanthitelsonis, Bate. According to Alcock 4. agassizit 1s 
a synonym of A. purpurea. Distinguishing features for the 
present species will be noted in the course of description. 
The straight, slender rostrum is scarcely as long as the rest 
of the carapace. It has seven teeth above and four below, all 
well separated, the hinder ones not approximate as in A. 
sanguinea, which has the rostrum relatively much longer and 
curved upwards. In the other species mentioned the rostral 
spines are more numerous. The antennal and branchiostegal 
spines are distinct, not obscure as in A. sanguinea. The low 
rostral carina ends a little behind the small hindmost tooth, 
and the carapace is here obtusely channelled on each side of the 
widened base of the rostrum. The first pleon segment like the 
bulk of the carapace is devoid of any medio-dorsal carina, but 
the rest of the pleon as far as the telson is fully carinate, in 
this respect differing from A. purpurea, in which the carina is 
said to begin at the posterior end of the second segment. There 
is an apical tooth to the carina on the third to the sixth segments 
—largest, but not large, on the third ; smallest, but distinct, on 
the fourth segment. The telson reaches beyond the uropods. 
It is hollowed beneath, and above carries five dorso-lateral 
pairs of spines, the first a little above the middle, the last 
immediately above the apex. They are not quite symmetri- 
cally placed in our specimen, and one of the last pair is missing. 
At the apex are two longer spines, and between these projecting 
from the ventral surface are a trio of spines, the central one the 
stoutest and slightly the longest, but all shorter than the two 
