244 Part III. — Twelfth Annual Beport 



Boeck, in the same year (1864)* in which he instituted the genera 

 Stenhelia and Ameira, established a third genus, Nitokra, 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 Nitokra. 

 In 1891 l)r W. Giesbrecht described t 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 antennae 



' three-jointed. Mandible-palp with a distinct basal part, bearing 



' two separate branches. 

 For Ameira, Boeck. — ' Secondary branch of the posterior antennae 



' one-jointed. Mandible-palp one-jointed.' 

 For Nitoclira, Boeck. — ' Secondary branch of the posterior antennae 



' oue-jointed. Mandible-palp two-jointed.' 



If these definitions are to be considered satisfactory, the Ameira 

 longipes, Boeck, as described and figured in the ' Monograph of the British 

 ' Copepoda,' is a Nitokra, as the figure of the mandible-palp exhibits two 

 distinct joints or branches ; and probably, also, are all the species described 

 here as Ameira. The subject evidently requires further study, so far as 

 the British Stenheliince are concerned ; and meantime I prefer to adhere to 

 the generic definition of Ameira 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). 

 (?) Tetragoniceps consimilis,\ sp. n. (PI. VII. figs. 4-12.) 



Description. — Female. Length, "85 mm. (-^j-th of an inch). In general 

 appearance very like Tetragoniceps bradyi, T. Scott. Rostrum prominent. 

 Anterior antennae 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 : — 



28-12-7 • 8 • 4 • 4 • 4 • 6 • 

 1 • 2 • 3-4 • 5 • 6 ■ 7 ' 8 " 



Posterior antennae 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. Cydopid. og Harpactid. (Christ,), 

 64. 

 t Die freilebenden Copepoden der Kieler Fohrde. 

 J Consimifis = very like. 



