492 
After a careful study of the structure of all these three 
forms, it seems to us that, though the affinity between 
Canuella and Sunaristes is very close, yet the differences that 
separate them are too important to be regarded as of merely 
specific value, and that we are therefore justified in still 
retaining Canuella as a distinct genus. 
The following is a tabular arrangement of the more 
important differences that distinguish the three genera :— 
In October 1893 we published * a description, with figures, 
oi a somewhat curious Copepod from Loch Linnhe, Argyl- 
shire. it was described under the name of Remigulus tridens, 
Note on Remigulus tridens, 7. and A. Scott. 
Messrs. T. and A. Scott on 
i] 
Male Inner branches of second . Abdomen of 
Genus. | antennules. pair of swimming-feet. Fifth pair female. 
Longipedia..| Feebly | From two to nearly three Small, Composed of five 
clawed. times the length of the| foliaceous. segments, as i 
outer branches and nearly the male, 
alike in both sexes (end- 
joints greatly elongated). 
Canuella,...| Feebly | Of about the same length | Rudimentary.| Composed of five 
clawed. as the outer branches segments, as 1 
and alike in both sexes. the male, 
Sunaristes ..| Strongly | Of about the same length | Rudimentary.) Composed of fou 
clawed, as the outer branches; segments (th 
in the male the first and first consisting 
second joints are pro- of two con 
duced into strong spine- pletely co 
like processes. esced somi 
in the mM 
composed 
five segments, 
gen, et sp. n., as no previous record of its occurrence was at 
the time known to us; and from certain peculiarities of 
structure observed we stated in our remarks of the Copepod 
that, “ though obtained amongst dredged material, its struec- 
ture clearly indicates semiparasitic habits similar to the 
Lichomolgide and other allied forms.” A considerable time 
after our description was published we ascertained that 
MM. Canu and Cuenot, in a memoir entitled “‘ Commensaux 
* Ann, & Mag. Nat. Hist. ser. 6, vol. xii. p. 242, pl. xi. figs, 15-20, 
pl. xii. figs. 1-3 (Oct, 1893), 
