110 BRITISH COPEPODA. 
to the youngest stages of growth. . . . Many 
species may, no doubt, have been founded on characters 
no more distinct than these, and on mere deviation 
of character in the joints, which a critical investigation 
would prove to be worthless.”’* It may be noted that 
many of the peculiarities here pointed out by Dr. Claus 
-—especially the strong, doubly-curved claws of the 
first feet in the stronger, and the very slender simply- 
curved claws in the weaker form—have their exact 
counterparts in the two varieties of D. tisboides here 
described. 
2. Dacrynorus siminis, Claus. Pl. LV, figs. 14—16. 
Dactylopus similis, Claus. Die Copepoden-Fauna von Nizza, 
p. 25, taf. ii, fics. 29, 30 (1866). 
This species differs little from D. Stromw except in 
the proportionate lengths of the various antennal 
joints, the length of the rostrum, and some other 
minor points. ‘The rostrum is very long and curved, 
and the relative lengths of the joints of the anterior 
antenna (fig. 14) may be expressed (allowing some 
latitude for individual variation) as follows: 
Les Os ES ORO rans ee. 
OM MLZ CS er Sh tae moy mae ney 
The lower foot-jaw, the first and all the following 
pairs of feet differ scarcely at all from the same organs 
* Die Copepoden-Fauna von Nizza, Hin Beitrag zur Charakteristik 
der Formen und deren Abadnderungen, ‘“‘im Sinne Darwin’s,” von Dr. 
C. Claus, Marburg und Leipzig, 1866. 
