393 Part III. — Eighteenth Annual Report 



(?) Tetragoniceps malleolata, but, for the reasons stated below, I prefer to 

 lescribe it under a distinct name rather than as a " variety " of the 

 species referred to ; for, after all, the question as to whether a thing is a 

 " species" or a "variety " is very much a matter of opinion. 



Description of the Female. — In general appearance the female of 

 Tetragoniceps brevicauda is not unlike the form just described, but is 

 somewhat smaller. The specimen figured (tig. 18) is only about "7mm. 

 (about 3^ of an inch in length). The antennules have a structure 

 somewhat similar to those of (?) Tetragoniceps malleolata, and there is 

 the same hook-like process on the distal extremity of the first joint ; the 

 proportional lengths of the nine joints are, however, somewhat different. 

 The mouth-organs and swimming-feet resemble those of the species named, 

 except that the first feet appear to be rather more slender, and the fifth 

 pair are proportionally somewhat smaller, but the secondary joint of the 

 fifth pair is distinctly more elongated proportionally than that of the fifth 

 pair in (?) Tetragoniceps malleolata (fig. 21). The caudal segments (fig. 22) 

 are distinctly shorter than those of the species named, and they are also 

 proportionally stouter ; the size and form of the caudal furca of the species 

 under description are so different from those of the closely allied form 

 previously recorded as not only to have suggested the name that has. 

 been applied to it, but were the chief characters that first attracted my 

 attention when examining the material in which it was found. 



No males of this form and only very few females have been observed. 



Habitat. — Firth of Forth, off St. Monans. 



Pseudolaophonie spinosa (I. C. Thompson). 



1893. LaopJwnte spinosa, I. C. Thompson, Revised Report on the 

 Copepoda of Liverpool Bay, Trans. L'pool. Biol. Soc, vol. 

 vii., p. 24, PL XXX., figs. 1-13. 



1896. Pseudolaophonie aculeata, A. Scott, Report Lancashire 

 Sea Fisheries (1895), p. 11, PI. III., figs. 7-23. 



This rare copepod species occurred in a gathering of dredged material 

 collected near Otter Spit, Loch Fyne ; a male and a female specimen 

 were obtained. The antennules in this species are each furnished with a 

 prominent and strong spine on the lower (exterior) aspect of the second 

 joint; both the male and female possess these spines; the female 

 antennules appear to be only four-jointed. The species has a close 

 general resemblence to Laophonte, so much so that, like Mr. V. C. 

 Thompson, I was at first inclined to regard it as a member of that genus, 

 but a close examination of the thoracic appendages, and especially of the 

 swimming-feet, bring to light structural differences that must exclude it 

 from the genus Laophonte. The principal differences, as pointed out by 

 Mr. A. Scott, are observed in the structure of the second and third pairs 

 of swimming-feet. In the second pair each foot consists of a single one- 

 jointed branch, and in the third pair, though each foot is two-branched, 

 both branches are only two-jointed. This interesting and somewhat 

 anomalous copepod has not before been recorded from the Clyde district. 



Leptopsyllus minor, T. and A. Scott. 



1895. Leptopsyllus minor, T. and A. Scott, Ann. Scot. Nat. Hist. 

 (Jan. 1895), p. 31, PI. II., figs. 15-22. 



This species belongs to a group of peculiarly slender copepods, the 

 first of which was added to the British fauna in 1894.* Hitherto all the 

 * Part III. of Twelfth Ann. Report of the Fish. Board for Scot. (1894), p. 254. 



