Crustacea from the Firth of Forth. 205 



Ascidian in which the others occurred, and tliis one carried 

 two long- and slender ovisacs. Considerable difficulty was 

 experienced in dissecting out the parasite from the intestine 

 of the Ascidian, owing to the ovisacs being so slender and 

 fragile ; this character of the ovisacs possibly explains why 

 they have been so rarely observed. 



These Forth specimens appear to be identical with Entero- 

 cola eruca, Norman, a species obtained by the Rev. A. M. 

 Norman while dredging among the Shetland Islands, and 

 described in the Report of the Meeting of the British Asso- 

 ciation for 1868. One of the Forth specimens obtained last 

 year was submitted to Prof. G. S. Brady, and he considered 

 it to be identical with the species described by Dr. Norman. 



In the 'Monograph of the British Copepoda,' by Prof. G. S. 

 Brady, that author, while including Eaterocola, M. van 

 Beneden, in the family Buproridee, did so in deference to 

 Dr. Claus's opinion, but at the same time expressed himself 

 as doubtful of this being its proper position. 



Though the Enterocola from the Firth of Forth agrees to 

 some extent with the characters of the family Buproridse as 

 described in the * Monograph of the British Copepoda,' it 

 differs in one important character : the Buproridas are 

 described as having " no external ovisac," but the Forth 

 Enterocola possesses two ovisacs which are well developed. 

 The Enterocola described and figured by M. van Beneden in 

 the ' Bulletins de 1' Academic lioyale de Bruxelles,' 2° sdrie, 

 tome ix. (1860), p. 155, as Enterocola fulgens^ though 

 certainly quite distinct from the Forth species, agrees with it 

 in also possessing two external ovisacs ; these ovisacs, if not 

 so large as those of our specimen, are yet of considerable 

 size ; M. van Beneden's figure shows them to be nearly as 

 long as the animal. 



This marked difference between Enterocola and the Bupro- 

 ridte shows the correctness of Prof. Brady's doubt as to the 

 position of Enterocola. Jf one of the characters that distin- 

 guish the Buproridie be the absence of external ovisacs, the 

 position of Enterocola in that family becomes untenable. 



Bathyporeia norvegica, G. O. Sars. 



This Amphipod has recently been obtained in the Firth of 

 Forth, where it appears to be a rare species. 



Cerajn's crassicornis (Spence 'QaXa) , = Siphonoscetus crassi- 

 corniSj Spence Bate, has also been recently obtained in the 

 Forth, it was observed in some material collected by means 

 of a tow-net worked near the bottom. C>nc specimen only 



