64 
Rev. A. M. Norman on Crustacea Cumacea. 
cessively minute spinules between the spines just enumerated ; 
outer ramus reaching only to the end of the second joint of 
inner, very narrow and slender in structure, with about eight 
small slender setm on each margin. Length 8-9 millims. 
Two specimens , 1 Porcupine ’ Expedition, 1869. Station 11, 
lat. 53° 24' N., long. 15° 24' W., 1630 fathoms. 
I have named this species in honour of Captain Calver, the 
able commander of H.M.S. 1 Porcupine,’ to whose nautical 
skill, untiring zeal, and keen appreciation of the value of 
scientific research, exhibited in his able and successful conduct 
of the 1 Porcupine ’ Expeditions, natural history owes so 
much. 
16. Diastylis armata , n. sp. 
1876. Diastylis armata, Norman, MS., ‘Valorous’ Report, Troc. Royal 
Soc. xxv. p. 212. 
Female. Cephalothorax short; free segments remarkably 
short, scarcely half as long as the carapace, the three poste¬ 
rior segments developed as usual, but the two before these 
only indicated by a narrow fillet. Carapace broad, deep, and 
tumid ; length only half as much again as depth; dorsal margin 
boldly arched in the centre, declining posteriorly, and still 
more anteriorly in the sweep to the rostrum ; posterior margin 
abruptly truncate; lateral margin strongly arched in the centre, 
where the carapace attains its greatest depth ; anteriorly the 
margin is serrulate ; serrulations about twenty, increasing in 
size in front; no infero-anteal angle, the lateral margin gradu¬ 
ally sloping upwards to the rostrum ; rostrum short, reaching 
the middle of the second joint of the peduncle of the upper 
antennas, its sides rapidly converging to the acute point in 
which it terminates; surface of carapace for the most part 
glabrous and devoid of spines, sculptured with scattered little 
shallow pittings ; the rostrum bears a pair of conspicuous, acute, 
erect spines ; behind these each lateral lacinia bears a longitu¬ 
dinal curved row of four spines, the anterior of which is simi¬ 
lar to those on the rostrum, but the hinder ones very small • 
beneath this row, between it and the lateral margin, is an 
isolated triangular spine of small size. The free cephalothoracic 
segments and those of pleon are all quite smooth, save that 
the epimera of the last cephalothoracic segment are armed with 
a spine (but not produced backwards). Upper antennce have 
the three joints of peduncle subequal, the first armed with a 
spine at the extremity on the lower side. First legs with the 
basal joint strongly armed with spines all along the margin. 
Pleon exceeding the length of the cephalothorax by its last 
two segments. Telson longer than the peduncle of the uropods, 
