472 Vart III. — Twentieth Annual Report 



The fifth pair consist each of a single one-jointed lamelliform branch, 

 sub-cylindrical in outline and fully twice as long as broad ; they are each 

 furnished with a single seta on the outer margin, while two setpe and a 

 small spine spring from the truncated apex — the spine being articulated 

 at the inner angle ; a seta also springs from the exterior angle of the last 

 thoracic segment, to which the fifth foot is articulated (fig. 42). 



The caudal furca are moderately broad and nearly as long as the 

 last abdominal segment (fig, 36). 



Habitat. — Dredged at Station VII., Firth of Forth (between Fidra 

 and the Bass Keck), on July 9th, 1901. Only a single female specimen 

 was observed. 



Remarks. — The specimen described above has such a close general 

 resemblance to Clausia duthae, T. and A. Scott,* that it was at first 

 considered to belong to the same genus, but when closely examined it is 

 found to differ in several important points, i.e. the structure of the 

 antennae and the form and armature of the second maxillipeds. The 

 inner branches of the first four pairs of thoracic feet are all three-jointed, 

 and thus difi"er very distinctly from those of Clausia. 



I do not know of any genus or species to which this copepod could 

 be ascribed. 



AsTEROCHERIDiE. 



Asterocheres violaceus (Claus). 



This somewhat rare species was obtained in a bottom gathering collected 

 about 60 miles to the east of Shetland (or 180 miles north-east of 

 Buchan-ness), on May 22nd, 1901. This species has been taken by 

 my son, Mr. Andrew Scott, in the Irish Sea,t and it has also been obtained 

 in the Firth of Clyde.J 



Rhynchomyzon purpurocinctum (T. Scott). 



This distinct and widely distributed species was observed in some 

 material dredged at the north end of Inchkeith on May 23rd, 1901. The 

 specimens from which the species was described were also obtained in the 

 Firch of Forth, but nearer the mouth of the estuary. Rliynchomyzon 

 purpurocinctum, though widely distributed, is not very common, and 

 occurs only very sparingly. 



Acontiophorue ornatus (Brady and Robertson). 



1875. Ascomyzon ornatum, Brady and Robertson, Brit. Assoc. 



Rept., 1875, p. 197. 

 1880. Acontiophorus armatus, G. S. Brady, Mon. Brit. Copep., 



vol. iii., p. 71, pi. Ixxxvii., figs. 8-15. 



A few specimens of this fine species were obtained in the washings of 

 some dredged material collected near North Craig, Firth of Forth, on July 

 4th, 1901. This is the first time Acontiophorus ornatus has been observed 

 in the Firth of Forth. It is a moderately large species, being not only 

 robust in form bnt reaching a length of about one and a half 

 millimetres. 



* Ann. and Mag. Nat. Hist., (6), vol. xviii., p. 1, pi. 1, figs. 1-12. 

 t Report for 1895 on the Lancashire Sea-Fisheries Laboratory, p. 54, pi. v., figs. 16-26 

 described under the name of Ascomyzon (hovipsoni), pub. 1896. 

 J Sixteenth Annual Report of the Fishery Board for Scotland. Part IIL, p. 270 (1898). 



