278. Part III.—Twenty-second Annual Report 
more common Lernea branchialis, and hitherto it appears only to have 
been observed on the gills of the Brassie or Whiting Pout (Gadus luscus, 
Linn.). The specimen I have to record was obtained on the gills of a 
Brassie captured about ten miles off Aberdeen on January 16, 1901. 
This parasite measures a little over half an inch from the head to the end 
of the genital segment. The neck is slender and short, and the append- 
ages of the cephalon are moderately developed. Dr. Bassett-Smith 
describes the posterior appendage as being sometimes as long as the neck, 
which is also characteristic of the specimen now recorded (fig. 13). The 
genital segment is considerably dilated and strongly sigmoid, except at 
the posterior end where, in marked contrast to Lernea branchialis, it is 
only slightly curved ; the twisted egg sacs are proportionally not so slender 
as in that species. 
Lernea lusci does not appear to have hitherto been recorded from 
Scottish waters, having been probably regarded as a form of L. branchialis. 
Figure 12 shows the specimen attached to the gill-arch of the fish. 
Brachiella pastinace, Van Beneden. 
1851. Brachiella pastinace, Van Beneden, Ann. des. Sci. Nat., 
ord ‘sor., tb. XV1.; P.. L 20, Dis IV.) 1108. 0,00, 
Two specimens of this Brachiella were obtained in the nasal fossz of 
the Trygon in which the Hudactylina just described was found. One 
specimen occurred in each of the two fosse. These two specimens which 
were posted to the artist along with a few other things in order to have 
drawings of them prepared, failed to reach their destination, and I am there- 
fore unable to furnish figures of this species. 
PART II.—TREMATODA. 
Fam. TRISTOMATID. 
Thaumatocotyle concinna, gen, et. sp. nov. Pl. xvii., fig. 15. 
A large sucker-disc, so characteristic of several of the Trematoda, is 
attached to the distal end of the body by a very short stalk which is 
apparently flexible. The sucker is nearly circular in outline, and its ventral 
surface is divided into thirteen marginal compartments which are separated 
from each other by narrow muscular bands ; the compartment at the lower 
end of the sucker is larger than any of the other twelve and is of the 
form of an equilateral triangle, the blunted apex of which is directed 
inwards and reaches fully half way toward the centre of the sucker; the 
other twelve marginal compartments are of nearly equal size and are sub- 
quadrate in form, as shown in the drawing (fig. 15). Two moderately 
slender rods spring from two adjacent muscular bands near the centre of 
the disc, and extending to the circumference of the sucker termimate in 
little hook-like processes—one on each side of the lower triangular 
compartment. 
The anterior end, which terminates somewhat abruptly and has a broadly 
triangular outline, is bifureated in the middle. On the ventral aspect, 
close to the margin on each side of the fork and extending from it to the 
outer angle, there are arranged three small discs which may probably 
function as suckers. ie 
The length of the specfmen represented by the figure is about 3 milli- 
metres (nearly + of an inch), while the breadth at the widest part 1s 
equal to about one fifth of the length ; the body is flattened and in some 
specimens nearly transparent, so that the internal structure may to some 
extent be discovered. 
