SIPHONO.STO.MATA. 409 



The eye itself, under the lens or microscope, exhibits constant motion, 

 and even to our unassisted vision its red colour — that of the lady-bird, 

 Coccinella sept e nip ttnc- 

 tnta — is apparent ; 

 when magnified it 

 looks black where the 

 lines and dots are, red , 



elsL where. ' 



After having been about four or five hours in the salt water, and dis- 

 playing its wonted activity to the last, the specimen was lost during my 

 absence from the room. I had intended to observe how long it — a fresh- 

 water species — would live in salt water, but though foiled in this, have 

 thought these notes, made with the living animal before me, might pei'- 

 haps be worth the room they occupy, more especially as the Arf/ulus 

 seems to be very little known as a British species. From what has been 

 stated it would seem to be very tenacious of life. The individual here 

 treated of is the second Irish one I have seen ; the other was, when 

 swimming freely in Lough Neagh, taken by Mr. Hyndman in the autumn 

 a few years since. Like the present specimen, it displayed a mass of 

 large ova. 



Genus Caligus. 



C. 3IuUeri, Leach. 

 " North of Ireland," Mr. Templeton. 



C. salaris f J. V. Thomp. 

 " South of Ireland," J. V. Thompson. 



C. scombri, J. V. Thomp. 



" South of Ireland," J. V. Thompson. 



C. productus, Miill. 



" Xorth of Ireland," Mr. Templeton. 

 Belfast Bay, W. T. 



C. minutus, Otto. 



I obtained a specimen off a holibut in Belfast market in February, 

 1837. It differs very little — hardly in species — from C. hippoglossi, Kroyer, 

 Tidssk. bind i. p. 625, pi. 6, f. 3 (1st series). 



M. Edwards notes the species as found on the coast of Bretagne in the 

 branchial cavity of the " Bass " [Basse. Lcibrax lupus, Cuv.]. 



C. dinphanus, Nordm. 



Nordmann obtained this species off Trig/a hirundo. I have procured 

 it not only on that fish but on the following, purchased in Belfast market : 

 — Tri(/la jji'ti, Pagellus ccntrodontus, Scomber scombrus, Caraiix fraehu- 

 rus, Merlaufius carbonarius, Merluci'is vuh/aris, Lota moira, Plafessn vul- 

 garis, and Pleuronectes maximus. Tlie specimens were taken in ]March, 

 August, October, and December (1837). 



0. Stromii, Baird, 

 I have found on Salmo trutta taken in Dundrum Bay (Co Down), Aug., 

 1836, and on the same species captured in the sea at Donaghadee in 

 March ; on Salmo eriox from the latter locality in Dec. ; on Salmo solar 

 taken on ascending two of the Co. Antrim rivers from the sea in June 



