246 Rev. Canon A. M. Norman on British Mjsidae. 



Northumberland, and within a year or two afterwards at 

 Howden and Seaham Harbour on the Durham coast. It has 

 also been procured for me at Starcross, Devon, bj Mr. C. 

 Parker, and I took it in 1889 at Plymouth : Mus. Nor. In 

 1885 Mr. G. Brook sent me a specimen to determine from 

 Tarbert, Loch Fyne. I have always considered it to be the 

 ''''Cynthia Flemingii, H. Goodsir," although his description is 

 very inexact. It is evident from his description of the 

 antennal scale that he had no true Siriella (= Cynthia) before 

 him, but the account is not sufficiently accurate to allow of 

 his name being adopted. 



Distribution. Floro, Norway, 10-12 fath. ; Naples {A. 

 M. N.); Adriatic [Claus) -. Mus. Nor. Farsund, 10-12 

 fath. ; Moldo and Aalesund, Norway ; Cagliari, Mediterranean 

 {G. 0. Sars) ; Black Sea {Czerniavshy) ; Boulonnais {Giard). 



A Leptomysis has been described from the Mediterra- 

 nean under the names LejAomysis sardica, G. 0. Sars, and 

 Leptomysis pontica^ Czerniavsky, which it appears to me 

 cannot be separated specifically from the northern Lepto- 

 mysis lingvura, G. O. Sars. The fact is that the telson 

 is subject to very considerable variation in northern and 

 Mediterranean specimens. That L. lingvura occurs in the 

 Mediterranean basin is certain, as some unnamed Mysidse sent 

 to me by Prof. Claus from the Adriatic unquestionably belong 

 to that species. Leptomysis sardica I took at Naples in 1887. 

 The specimens were very much smaller than L. lingvura as 

 found in the north, and some only 7 millim. long have the 

 marsupial pouch fully developed ; the telson of some of these 

 closely agreed with Sars's figure, but there was considerable 

 variation (from three to five) in the number of small spines 

 between the central long pair of spines ; in other specimens 

 there were one or two more pairs of spines on the sides of 

 greater length than the others. On examining small northern 

 specimens of M. lingvura of about similar size I find the 

 spination of the telson closely to accord with that of L. sar- 

 dica^ and as the animal increases in size the number of larger 

 spines interspersed among the smaller ones of the lateral 

 margins increases also. It appears to me that L. sardica 

 must be regarded as a small race of L. lingvura, with which 

 it agrees in all general characters. It is no new thing to 

 find that southern examples of an animal are of smaller size 

 than more northern brethren. 



