tZ 
114 Part 11 —Twenty-third Annual Report 
Sphyrion lumpi, T. Scott, 19th F.B. Rept., Pt. III., p. 128, vol. 
vii., fig. 13. 
A fine specimen, the most perfect I have seen of this curious species, 
was presented to me by Mr, Irvine of Aberdeen ; it was obtained by him 
on one of a number of catfishes, Anarrhicas lupus, landed at Aberdeen 
Fish Market from a Norwegian trawler. The fishes were captured in | 
about 200 fathoms, and therefore beyond the limits of the Scottish area. 
An imperfect specimen was taken from a Lumpsucker captured in April: 
1900 in the nets of the salmon fishers near the Laboratory at Bay of 
Nigg, Aberdeen, and is described and figured in Part III. of the 
Nineteenth Annual Report of the Fishery Board for Scotland. 
Genus Chondracanthus, De la Roche (1811). 
Chondracanthus depressus, sp. n. Pl. vi., figs. 7-13. 
Description of the Female.—This species resembles in its general 
appearance the Chondracanthus flure of the Long Rough Dab, Drepanop- 
selta platessoides, but it is more depressed. The cephalon, which is sub- 
quadrangular, is scarcely as long as broad, the next two segments are also 
wide and very short, while the last thoracic segment is distinctly con- 
stricted in the middle and very depressed ; it is broader in proportion to 
its length than the same segment in Chondracanthus flure, being about 
as broad as it islong. The postero-lateral processes are somewhat narrow, 
cylindrical, and sigmoid, and curved inward so as to approach close to each 
other, and sometimes overlap (fig. 8). The abdomen is very short. 
The specimen represented by the drawing (fig. 7) measures about 5 mm. 
(4 of an inch), exclusive of the ovisacs, which are tolerably short and 
thick. 
The antennules are short and very robust ; they are simple in structure ; 
and the distal extremity, which appears to be obscurely jointed, bears 
scattered apical spinules (fig. 9). 
The antennz are somewhat similar to those of Chondracanthus cornutus. 
The mandibles, which are stout, moderately elongated, and strongly 
curved, taper gradually to the attenuated distal extremity ; they are each 
armed with a row of small but moderately stout denticles along each 
margin, as shown in the drawing (fig. 10). 
The first maxillipeds are greatly dilated at the base, and the terminal 
joint, which is also stout, tapers to a blunted apex, the internal margin 
is coarsely toothed on the distal half (fig. 11). 
Thoracic feet two pairs, short, stout, and bifid, or with two rudi- 
mentary branches ; both branches are stout, but the outer is shorter and 
scarcely so much dilated as the inner. Though the first pair are as robust 
as the second they are scarcely so long ; the two branches in both pairs are 
covered more or less with minute prickles, as shown in the drawings (figs. 
12 and 13), 
Habitat.—On the gills of the Flounder, Plewronectes flesus, captured in 
the Firth of Forth and St. Andrews Bay. 
This form differs from any of the species previously described by the 
very short anterior thoracic segments and by the last segment being 
depressed and of a broadly quadriform outline, as well as by the structure 
of the thoracic legs. 
A form which appears to be a variety of the species just described, and 
which has also been observed on the same kind of fish, differs in being 
rather more elongated and less depressed. The antennules are larger, 
with a slightly different armature ; the two pairs of thoracic legs are also 
larger and more robust, and the inner branches more distinctly triangular 
