106 ME. THOMAS SCOTT ON THE 



few specimens were obtained. This species, and probably also 

 B. temiiremis, should be regarded as belonging to the genus 

 Diosaccus, as both appear to be furnished with two ovisacs. 



Dactylopus Stromii (Baird), var. aecticus, var. nov. (PI. 5. 

 figs. 11-17.) 



1850. Canthocamptu Stromii, Baird (3), p. 208, pi. 27. fig. 3. 



A number of specimens of a Copepod, which can hardly be 

 distinguished from Dactylopus Stromii (Baird), were collected 

 about 50 yards off West Point, Cape Flora, during June and July, 

 1897. The specimens are from comparatively shallow water — 

 2 to 4 fathoms ; and differ from British species of D. Stromii 

 chiefly in the following points :— (1) The antennules have nine 

 instead of eight joints (fig. 12) ; this diflference, however, appears 

 to be immaterial, as the number of the joints of which the dit^tal 

 half of the antennules is composed seems to be liable to variation. 

 (2) The posterior foot-jaws (fig. 13) are large and powerful, the 

 second joint is elongate and subcylindrical instead of ovate, and 

 they differ somewhat in their armature. (3) In the fifth pair 

 of thoracic feet the outline of the secondary joint (fig. 15) and 

 the arrangement of the setaB with which it is furnished are 

 somewhat dissimilar to the normal form of the species; and 

 (4) the ova-bearing females carried two ovisacs instead of one. 

 The first pair of swimming-feet (fig. 14), as well as the second, 

 third, and fourth pairs, resemble very closely the same appendages 

 in D. Stromii. The species has a wide distribution in the North 

 Sea, and seems to extend all round the British Islands. 



Genus Thalesteis, Claus, 1863. 



Thalesteis helgolandica, Claus. 



1863. Thulestris helgolandica, Claus (23), p. 131, pi. 17. figs. 12-21. 



A few specimens of this Thalestris were obtained in a gathering 

 from 30 fathoms, collected July 21st, 1897, off East Glacier, 

 Cape Mora. Thalestris helgolandica is a Avell-marked species, 

 and, though apparently not very common, it has evidently a wide 

 distribution. It occurs sparingly at various places around the 

 British Islands. 



Thalesteis polaets, sp. n. (PL 7. figs. 8-16.) 

 A Thalestris, which I have named as above, occurred very 

 sparingly in gatherings collected at the following places : — From 

 sand near East Glacier on August 5th, 1896 ; off West Point, 



