4 BRITISH OOPEPODA. 
joints (one to three), and sometimes (Nannopus, Platy- 
chelipus) is reduced to a small papilla bearing a few sete. 
The genera in which two non-coalescent ovisacs occur 
are very few, probably only two—Dviosaccus and Dela- 
valia. 
Diagnosis of Sub-families of Harpacticide. 
(Non-preliensile: iso. vaccsconeie sense ons arena eee meee Longipediine. 
(forming a powerful clawed hand ..............006. Idyme. 
( broad and 
| not 1-joint- ) lamelliform Porcellidwne. 
in the elongated ed 
2 form | Ween nor slender ...Amymonine. 
os Ola gl ee a adapted 
2 | Be lke ee ones LOK (PLC) | (a-jOUNue de ececn eee sae Nannopine. 
= hen AOGORIEE. hension 
a) sile x P but not | o-Joumbed, saan Tachidune. 
= | clawe 
@ | hand: eve a | and provided with 
a BEES) io Theen a. strong uncinate 
j rior otaes 2- or terminal claws ......... Harpacticine. 
| foot- be ee 3-joint- 
} jaw Fall arate ed, < hinged, 
) ; elon- | imperfect- | 1-branched Canthocamp- 
{ | gated | ly clawed;4 tine. 
| | | mandible- | 
G L ie  palp | 2-branched Stenheliine. 
Sub-family 1. Lonerrepiune, Boeck. 
The characters which distinguish the genera belong- 
ing to this section are as follows:—The accessory 
branch of the posterior antenna is largely developed ; 
mandible-palp 2-branched, the branches springing 
from a large basal plate; the posterior foot-jaws are 
not formed for prehension, having no clawed hand ; 
the first pair of feet is like the following pairs, both 
branches being adapted for swimming and not at all 
for grasping. 
