COPEPODA. 



TlSBE LONGICORNIS (T. & A. Scott). 



1895. Idya lonyicornis, T. & A. Scott, Ann. & Mag. Nat. Hist. 

 ser. 6, vol. xv. p. 461, pi. xvii. figs. 10-17. 



1905. Idya longicornis, G. 0. Sars, p. 92, pi. liv. fig. 1. 



A single specimen was obtained from Starcross, June 20th, 

 1884; and several from New Grimsby Harbour and St. Mary's, 

 Scilly Islands, collected in May ; and from Cawsand Bay and 

 off Jenny Cliff Bay, Plymouth, in August 1903. This species 

 is larger and has longer antennules than Tisle furcata. 



O 



TISBE MINOR (T. & A. Scott). 



1896. Idya minor, T. & A. Scott, Ann. Scot. Nat. Hist. (1896) p. 228, 

 pi. iv. figs. 11-17. 



1905. Idya minor, G. 0. Sars, p. 90, pi. Hi. fig. 2. 



Obtained at Salcombe, Starcross, Plymouth ; and New 

 Grimsby Harbour, St. Mary's, and Tresco, Scilly Islands, but 

 not very common. 



Tribe III. CYCLOPOIDA. 

 Fam. 1. CYCLOPID^E. 



OlTHONA SIMILIS, ClaUS. 



1866. Oithona similis, Glaus, Die Copepodenfauna von Nizza, p. 14. 

 192. Oithona similis, Giesbreclit, pp. 537 & 548, pi. xxxiv. figs. 18, 

 19, 21 , 30-39 ; pi. xliv. tigs. 3, 5, b-11. 



Salcombe, 1875. Starcross, 1880 and 1884. Off Fal- 

 mouth, 1889 ; and in several of the tow-net gatherings 

 collected in the neighbourhood of Plymouth. 



The species recorded here appears to agree fairly well 

 with the description and figures of Oithona similis given by 

 Dr. Giesbreclit. That author considers that this species 

 and 0. helgolandieus, Clans, are probably identical, but 

 Professor G. 0. Sars * asserts that the forms so named are 

 distinct. A careful revision of the species may be necessary 

 ere this difficulty is cleared up; meanwhile we retain the name 

 adopted by Giesbreclit, who, in the work referred to above, 

 discusses "fully the question of the synonymy of this and 

 other species. 



* The Norwegian North-Polar Exped. 1893-96, No. V. Crustacea, by 

 G. O. Sars, p. 119(1900). 



