4.72 Part IIT.—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 sete 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 furea 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 Rock), on July 9th, 1901. Only a single female specimen 
was observed. 
Remarks.—The specimen described above has such a close general 
resemblance to Clausia cluthae, 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, z.e. the structure of the 
antenne 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 differ very distinctly from those of Clausia. 
I do not know of any genus or species to which this copepod could 
be ascribed. 
ASTEROCHERIDA. 
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,f and it has also been obtained 
in the Firth of Clyde. 
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. Ahynchomyzon 
purpur ocinctum, though widely distributed, is not very common, and 
occurs only very sparingly. 
Acontiophorus ornatus (Brady and Robertson). 
1875. Ascomyzon ornatum, Brady and Robertson, Brit. Assoc. 
Rept., 1875, p. 197. 
1880. Acontiopharus armatus, G. S. Brady, Mon. Brit. Copep., 
vol. i1., p. 71, pl. 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 haif 
millimetres. 
* Ann. and Mag. Nat. Hist., (6), vol. xviii., p. 1, pl. 1, figs. 1-12. ° 
+ Report for 1895 on the Teenie Sea-Fisheries Laboratory, p. 54, pl. v., figs. 16-26 
described under the name of Ascomyzon thompson), pub. 1896. 
{Sixteenth Annual Report of the Fishery Board for Scotland. Part III., p. 270 (1898). 
