172 Scientific Proceedings, Royal. Dublin Society. 
but when present at all they seemed to form the larger number of 
the sete, there being only a few with no spines or only rudi- 
mentary ones besides them. In all the other different specimens 
labelled LZ. filicornis that I examined the spines were well developed. 
Only in the “ Challenger”’ specimen, where very few ventral sete 
remained, these had rudimentary spines only. All this tends to 
confirm M‘Intosh’s view that there is but one species varying 
individually with regard to the spines on the ventral setee and prob- 
ably also. with regard to the relative lengths of palps and tentacle, 
although, as far as I know, it is only Kinberg’s original specimens 
which have the tentacle longer than the palps. When, however, I 
proceeded to count the elytra I found that on all the specimens 
I examined, and I examined a good many of both L. Kinbergi 
and L. jfilicornis, they were placed, as in the Irish specimen, on 
segments 2,4,5,7, . . . . 23, 25, 28,31. I am therefore led 
to conclude that only one species has as yet been found in British 
Seas. This we may call Letmatonice filicornis, Kbg. The relative 
length of the tentacles and palps may vary, though the tentacle is 
usually shorter than the palps*; there may or may not be a spine 
to the ventral setee (or possibly the presence of a large number of 
spined setee may be a sexual character acquired at certain times of 
year) ; the elytra are always on segments 2, 4, 5, 7,. . ; 
23, 25, 28, 31. To this species I should be inclined to refer the 
L. violascens of Grube,’ as there are in the British Museum (in the 
same bottle as Baird’s Z. Hinbergi) several specimens with a 
distinct violet tinge to their elytra, which I believe to be the same 
as the one specimen from which Grube described his species. 
Many of these, like Grube’s specimen, have no felty covering” ; the. 
palps vary in length, but the tentacle is usually a good deal 
shorter. The ventral setae mostly, but not entirely, have well- 
developed spines. The elytra are as in the other specimens with 
regard to their arrangement, and I should consider their colour 
8 The palps do occasionally vary in length on different sides of the body here as in 
L. producta, though not to so great an extent. This variation shows howlittle one can 
rely in this instance on the relative lengths of the head appendages in fixing the species. 
° Jahresbericht d. Schlesischen Gesellschaft, for 1874, p. 65. 
10 The Ivish specimen also had no felty covering over its back, though it had what 
appeared to be the remains of it at the sides of the body. Grube himself calls atten- 
‘ion to the fact that the felty covering is not always present in L. filicornis. 
