236 Part I11.—Twelfth Annual Report 
in the male dissimilar, and forming powerful grasping organs. The 
mandible-palp is comparatively small. One of the most prominent 
characters of this family is the structure of the anterior antenne. The 
most careful observation failed to show any difference between the male 
right antenna and the left, and both were similar to those of the female, 
In my paper on the Forth Fauna, published in Part III. of the Hleventh 
Annual Report of the Fishery Board for Scotland, two species of 
Copepoda were described, for which it was considered necessary to 
institute a new genus (Pseudocyclopia). This new genus was placed 
in the family Misophriide, Brady, because of its closer affinity with that 
family than with the family Calanide. A further study of the characters 
of the genus has, however, led me to the conclusion that its position in 
the family Misophriide is untenable ; and as there is no other family in 
which it can satisfactorily be included, I propose to constitute the family 
Pseudocyclopr.de for its reception ; and I do so with the greater con- 
fidence, as another species, now to be described, has recently been dis-. 
covered, possessing all the more prominent characters that distinguish 
the two already described. Dr W. Giesbrecht, in his memoir ‘ Mitt- 
‘heilungen tiber Copepoden’ (Abdruck aus den Mittheilungen aus der 
Zoologischen Station zu Neapel, ii. Band 1.2. Heft), also refers to some 
of the peculiar characters of the two described species, and to the 
difference between them and those that constitute the family Msophriude. 
Genus Pseudocyclopia, T. Scott (1892). 
Pseudocyclopia caudata, sp. n. (Pl. V. figs. 1-8.) 
Female. Like Psewdocyclopia crassicornis, 'T. Scott, in general appear- 
ance and dimension. Length, ‘65 mm, (,4th of aninch). Anterior antenne 
seventeen-jointed. Basal joint very large, the others small; the second to 
the fifth gradually decrease in size, the sixth is rather longer than that 
which preceeds or follows, while the ante-penultimate joint is more 
elongate than any of the others except the basal joint. The formula 
shows approximately the proportional lengths of all the joints :— 
D958 8 76D AC: 7 SDP COICO fs 0 aoe lO 26 0 uaa 
12 8 4 5 6 7 8 OL ORIAY 12 aon ans Woy el Gi oily 
The posterior antenne, mouth organs, and first and second swimming- 
feet are somewhat similar to those of Psewdocyclopia crassicornis. The 
basal spines of the third pair of swimming-feet, which reach to near the 
extremity of the outer branches, are very stout, and with the distal end 
boldly curved—the basal spines, very like those of Psewdocyclopia minor, 
T. Scott. The fifth pair are somewhat more robust than those of the 
females of the two described species, and are each armed with three 
stout sub-equal and setose terminal spines. The caudal stylets are nearly 
equal to the combined length of the last two abdominal segments, as 
shown in the accompanying figures. 
Habitat.—Off St Monans. Scarce. 
Remarks.—Pseudocyclopia caudata is similar in its general appearance 
to the two species already described ; but is readily distinguished from 
both, even without dissection, by the comparatively elongate caudal 
stylets. The difference in the proportional lengths of the joints of the 
anterior antennz, and in the structure of the third and fifth pairs of 
thoracic feet between this and the other two species, is also of sufficient 
importance for diagnostic purposes. 
