172 Part IIL. —Fifteenth Annual Report 
SOME PARASITES OF CALANUS FINMARCHICUS. 
First. 
Calanus with (?) Microniscus calant, G. O. Sars (Pl. III. fig. 20). The 
drawing showsa Microniscus in situ on a Calanus, and this is the position 
in which I usually find the parasite when it happens to be attached to a 
Calanus , but the parasite is more frequently obtained free than in the 
position shown by the drawing, through its having, in oue way or other, 
become detached from the copepod. 
SECOND. 
Calanus infested by a Nematode parasite (Pl. III. fig. 21). This 
drawing is that of a Calanus, bearing internally a Nematode parasite 
much longer than its host. Lt sometimes happens that a considerable 
proportion of the Calani contained in a tow-net gathering will be found 
infested by these parasites, while at other times the parasites are rarely 
observed. 
THIRD. 
Calanus with (?) Infusorian parasite (Pl. III. fig. 22). This drawing 
is that of a Calanus with an Infusorian-like parasite adhering to it. 
Specimens of Calanus are sometimes found with several of these organisms 
attached to them; the parasites are found adhering to the body of the 
copepods, to the antennules, to the antenne, and to other appendages, but 
usually about the head ; sometimes large numbers of Calanus will he 
found infested by these parasites. 
All these three parasitic forms have been observed in the Clyde, up as 
far as the head of Loch Fyne, during the past year. 
DESCRIPTION OF THE PLATES. 
Piate I, 
Delavalia mimica, n. sp. 
Fig. 1. Female, side view, x 50 diameters 
Fig. 2. Antennule, female, x 507 ES 
Fig. 3. Mandible and Palp, . x 507 5 
Fig. 4. Posterior foot-jaw, x 760 Ms 
Fig. 5. Foot of first pair of swimming + feet, x 380 . 
Fig. 6. Foot of fourth pair of swimming feet,. x 337 ‘5 
Fig. 7. Foot of fifth pair of a feet, 
female; sat he x 380 * 
Fig. 8. Foot of fifth pair of swimming feet, 
male, (A) Appendage of first ab- 
dominal segment,male, . x 380 ms 
Fig. 9. Last abdominal segments and caudal 
stylets, ; : : . x 253 ” 
