389 Part III. — Eighteenth Annual Report 



The peculiarity in the fifth thoracic feet in Botryllophilus consists 

 mainly in their position on the last thoracic segment. Instead of occupy- 

 ing a position more or less on the ventral aspect of the segment, as is 

 usual amongst the copepoda, the position of the fifth feet is more or less 

 round towards the dorsal aspect, and as they each consist of a single- 

 jointed, elongated, and somewhat curved spine-like appendage which 

 projects more or less out from the body, they impart to the copepod a 

 rather curious appearance. 



After the above note on Botryllophilus had been sent to the printer, 

 several specimens of the copepod were obtained in situ in a specimen of 

 Botryllus sp. collected at Station X. in the Moray Firth on the 16th of 

 June 1898. Some of the specimens carried a globular ovisac on the dorsal 

 aspect between the fifth feet as stated above, but the ovisacs appear to be 

 easily detached ; they were of a pale cream colour, due, probably, to the 

 long immersion in spirit of the Botryllus. 



Canuella perplexa, T. and A. Scott. 



1893. Canuella perplexa, T. and A. Scott, Ann. Scot. Nat Hist , 

 vol. ii., p. 92, PI. II., figs. 1-3. 



This copepod was obtained in shore gatherings of Crustacea collected 

 at Cumbrae, Firth of Clyde, between tide-marks May 6th, 1899, and in 

 shore pools at Inverkip on the 13th of the same month. The species 

 appeared to be moderately rare at both places. Canuella is widely 

 distributed, but is apparently more frequent amongst weed and; where the 

 bottom is of a sandy nature. 



Ectinosoma gracile, T. and A. Scott. 



1896. Ectinosoma gracile, T. and A. Scott, Trans. Linn. Soc. 

 (2. z.) vol. vi., p. 429. Pis. XXXVI., XXXVIL, XXXVIII. 



A few specimens of this very small species were obtained in shore 

 pools at Inverkip, Firth of Clyde, May 13th, 1899. Ectinosoma gracile 

 has already been recorded from near Sanda Island, Firth of Clyde ; it 

 appears to be widely distributed, but being very small is easily over- 

 looked. 



Tachidius brevicornis (Miiller). 



1776. Cyclops brevicornis, Miiller, Zool. Dan., Prodr. (2414). 



Though Tachidius brevicornis appears to be generally distributed, there 

 are apparently few or no records of it as a member of the Clyde fauna. 

 Being a brackish-water species, it need not be sought for except where 

 such conditions exist, and as there are few shores around the British 

 Islands where brackish-water pools are not to be found, the distribution 

 of the species is correspondingly extensive. There are two species of 

 Tachidius recorded for Britain, but the one referred to is readily 

 distinguished by the structure of the fifth thoracic feet, which are of the 

 form of two comparatively broadly, roundish plates, the free margins of 

 which are fringed with setae. The species was found in shore pools at 

 Cumbrae in May 1899. The second species Tachidius littoralis, Poppe, 

 has already been recorded from Hunterston, Firth of Clyde.* 



Amymone nigrans, T. and A. Scott. 



1894. Amymone nigrans, T. and A. Scott, Ann. and Mag. Nat. 

 Hist. (6), vol. xiii., PI. VIII., figs. 1-7. 



This curious copepod is rather less than half a millimetre across the 



* Proc. Nat. Hist. Soc. Glasg., vol. V. (n.s.), p. 351, 1900. 



