DR. W. M. TATTEKSALL : AMPHIPODA AND ISOPODA. 3 
AMPHIPODA. 
Family LYSIANASSIDiE. 
Genus Parawaldeckia, StehUng. 
1. Parawaldeckia kidderi {S. I. Smith). (PI. 1. figs. 1-G.) 
Ncmnonyx hidderi, CJiiltou, 1909, p. 615. 
Parmoaldechia Thomsoni, Stebbing, 1910 (1), p. .571. 
Locality. Dredge oif Wallabj' Group, one male and two females, 6-7 mm. 
Distrihution. Kerguelen (Smith), Torres Straits (Miersj, Tasmania (Thom- 
son), New Zealand (Thomson), Campbell Islands and Auckland Islands 
(Chilton), Kermadec Islands (Chilton). 
Remarks. Tiie difficulties which present themselves to the student of 
Amphipoda in attempting to identify isolated specimens from remote 
localities are nowhere more abundantly illustrated than by a reference to the 
history of this species, as detailed by Chilton in the jiaper quoted above. It 
had been referred to three different genera and been described under at least 
five and probably as many as eight different specific names. Its adventurous 
career was even then not at an end, for in the next year Stebbing, who had 
not been able to consult Chilton's paper before his own went to press, pro- 
posed a new genus, Parawaldeckia, for the reception of Nannonyx tliomsoni, 
•one of the many synonyms of this species. It seems that at last the species 
has a permanent abiding place of its own. 
I believe my specimens to belong to the species as described by Chilton. 
They agree closely with his description except in one point. The adult male 
presents the usual sexual differences in the third uropods exhibited by so 
many Lysianassidre, in ]ia-\ing the rami of these appendages enlarged and 
fringed with plumose seta3. Chilton says that in the male the third uropods 
are the same as in the female. I give a figure of the telson of one 
of my specimens, showing it to be slightly excavated but not distinctly 
cleft. Each lobe of the apex is armed with two short spines, and there are 
two delicate plumose setae on each lateral margin. In this respect my 
specimens are in substantial agreement with Chilton's descriptions. The 
•outer plate of tlie maxilliped is broadly rounded and unarmed, the inner 
plate truncate and armed with three blunt teeth. 
The genus Parawaldeckia is characterised by the possession of accessory 
lob?s to the branchial vesicles and by having the last joint of the peduncle of 
the second antenna of the male dilated and moderately long, the remaining 
joints being small. It is very closely allied to Waldeckia, and differs only in 
having the telson sliglitly excavated, whereas in Waldeckia it is deeply cleft. 
My specimens agree with the definition of tlie genus Paraioaldeckia in these 
points. There can be no question as to its relationship to Waldeckia, for a 
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