of the Fishery Board for Scotland. 



397 



1896. In this species the fifth thoracic feet project outward from each 

 side of the body, and are more or less conspicuous. The genus Clausia 

 was established by Claperede in 1863. Boeck, not knowing this, estab- 

 lished a genus of free-swimming Copepods under a similar name in 1864, 

 but in 1872 Boeck changed his "Clausia" to " Pseudocalanus." 



Corycmus anglicus, Lubbock. (PI. XIII., figs. 1-14.) 



1857. Cory emus anglicus, Lubbock, Ann. and Mag. Nat. Hist. 

 (2), vol. XX., PI. XL, figs. 14-17. 



This pretty species was added to the British fauna by Sir John 

 Lubbock in 1857 from specimens which had been obtained at Weymouth. 

 For a considerable number of years afterwards our knowledge of the 

 British distribution of the species was almost entirely limited to the 

 information contained in the description which Sir John had published. 



In 1880 Prof. G. S. Brady, by the publication of the third volume of 

 his monograph of British Copepoda, was able to considerably extend the 

 known distribution of our Corycmus. But though our knowledge of its 

 British distribution continued to increase from year to year, there has 

 apparently beeu no record of it from the Scottish seas till 1896, when a 

 report of its occurrence in the Firth of Forth was published in Part III. 

 of the Fourteenth Annual Report of the Fishery Board for Scotland, 

 So far as I know, no further captures of Corycmus have been made in 

 Scottish waters till the past summer, when it was taken in the Firth of 

 Clyde. It occurred in a surface tow-net gathering collected in the 

 vicinity of Ailsa Craig on the 29th of May. 



The presence of Corycmus anglicus in our Scottish estuaries may be 

 owing to changes in the trend of oceanic currents induced by the 

 prevalence of certain winds,* or it may be that the methods of research 

 being now more perfect than formerly, the presence of such organisms is 

 more readily detected. Several specimens of Corycmus were obtained in 

 the Clyde gathering collected on the 29th of May, and some of the 

 colouring of the species still remained when they first came under my 

 observation. Both males and females were obtained. 



The female represented by the drawing on Plate XIII. measured slightly 

 over one millimetre in length, while the length of the male, which is 

 represented by one or two detailed figures on the same plate, was slightly 

 less than that of the female. The female antennules are short and six- 

 jointed. The proportional lengths of the joints are shown approximately 

 by the formula : — 



Proportional lengths of the joints, 8 • 8 ' 8 • 10 • 7 ' 5 

 Number of the joints, 1 • 2 • 3 "4 * 5 ■ 6 



The antennae (fig. 3) are stout ; each is armed with a moderately strong 

 and slightly-hooked terminal claw ; an elongated spine springs from the 

 inner distal angle of the first joint, while one or two smaller spines occur 

 on the other joints. In the male the terminal claws of the antennae are 

 long and sickle-shaped (fig. 12). The biting part of the mandible is 

 armed with a few moderately long teeth, and one or two spine-like lateral 

 appendages. The palp is very small, and composed of a single one-jointed 

 branch (fig. 4). The maxillae are simple, one- jointed and moderately 

 stout, and armed with a few short, stout, apical, and sub-apical spines 

 (fig. 5). The anterior foot-jaws (fig. 6) are short and very stout, their 

 structure is somewhat rudimentary, and their armature consists of several 



* My son, Mr. Andrew Scott, in a letter to me on July 28th, incidentally mentioned 

 that Mr. I. C. Thompson "had been getting Corycmus anglicus in abundance off Port 

 Erin, Isle of Man, a week or two ago." That would be nearly about the time it was 

 observed in the Clyde. 



