244 Part III —Twelfth Annual Report 
Boeck, in the same year (1864)* in which he instituted the genera 
Stenhelia and Ameira, established a third genus, Witokra, all three being 
closely allied to each other. Species belonging to the first two genera, 
but apparently none belonging to the last, have been recorded from the 
British seas ; at least I do not know of any record of a British Wetokru. 
In 1891 Dr W. Giesbrecht described + two new species of Nitokra that 
he had discovered amongst sea-weed in the estuary at Keil; and in doing 
so he drew attention to the more important characters by which these 
three genera may be distinguished from each other. The characters are 
these :— 
For Stenhelia, Boeck.—‘ Secondary branch of the posterior antenne 
‘three-jointed. Mandible-palp with a distinct basal part, bearing 
‘two separate branches. 
For Ametra, Boeck.—‘ Secondary branch of the posterior antennz 
‘onejointed. Mandible-palp one-jointed.’ 
For Nitochra, Boeck.—‘ Secondary branch of the posterior antenne 
‘one-jointed. Mandible-palp two-jointed.’ 
If these definitions are to be considered satisfactory, the Amera 
longtpes, Boeck, as described and figured in the ‘ Monograph of the British 
‘ Copepoda,’ is a Nztokru, as the figure of the mandible-palp exhibits two 
distinct joints or branches ; and probably, also, are all the species described 
here as Ameiva. ‘The subject evidently requires further study, so far as 
the British Stenheliine are concerned ; and meantime I prefer to adhere to 
the generic definition of Amezra in the ‘ Monogragh of the British Cope- 
‘ poda. ’ 
Genus Delavalia, Brady (1868). 
Delavalia reflexa, Brady and Robertson. 
1875. Delavalia reflexa, Brady and Robertson (10), p. 196. 
One or two specimens of this species were obtained among material 
dredged off Burntisland in November last year. Several other interesting 
species have been discovered here, one or two of which are described in 
the sequel. 
Genus Tetragoniceps, Brady (1880). 
(2) Tetragoniceps consimilis,{ sp. n. (Pl. VII. figs. 4-12.) 
Description.—Female. Length, ‘85 mm. (,4,th of aninch). In general 
appearance very like Tetragoniceps bradyi, 1. Scott. Rostrum prominent. 
Anterior antenne slender, sparingly setiferous, and eight-jointed. The 
length of the first joint is at least equal to the combined length of the 
next three, and it bears a few small but distinct blunt pointed teeth on 
the upper margin. The upper distal angle of the second joint is produced 
forward into a prominent tooth (fig. 4). The formula shows the propor- 
tional lengths of the joints :— 
2S AD Ol Bd ees ae sie 
Ler Bliy Aee gobi, wonses ke 
Posterior antenne elongate, slender, three-jointed ; the last joint is nearly 
as long as the other two together. A rudimentary secondary branch, 
furnished with a single apical seta, springs from the end of the first joint. 
The mandibles have the truncate biting part armed with several elongate 
* Oversigt, Norges Kyster, Copepoder, Calanid. Cyclopid. og Harpactid. (Christ. ), 
64. 
+ Die freilebenden Copepoden der Kieler Fohrde. 
{ Consimilis=very like. 
