304 On a tieto Species of fJte Isopod Genus SeroHs. 



tlie exopod of tlie nropods, it is usually about one-fiCtli of tlie 

 total length of the appendao-e. Studer fi inures it in S. Jafi- 

 fro77S^ as about one-third of the total length, but in the 

 specimens which I have examined it does not differ con- 

 spicuously from that of S. l>p(I<?anfi. 



Measurements in mm. — Holotype (female with empty 

 marsupium) : leno-th 23"76, breadth (across third thoracic 

 somite) 16*5, depth of body about G*25 ; telsonic segment, 

 leno-th 7-5, breadth 12-5. 



Male : length 22-0, breadth 16-75, depth about 5 25. 



The largest specimen (a female) measures 25 mm., the 

 smallest C'5 mm. in length. In very small specimens the 

 sculpturing of the dorsal surface and the tubercles of the 

 telsonic segment are much less marked, but the submedian 

 ridges of the latter are well developed. 



Fiff. 



Serolis heddardi. Kight uropod, from above. 



RemarJcs. — If Serol/s Jntifrons is confined, as seems possible, 

 to the Kerguelen area "j", the habitat of «S'. In'Jdardi is separated 

 by no less than 130 degrees of longitude from that of its most 

 closely related congener. Mr. 0. Tate Regan has called my 

 attention to a similar parallelism among the fishes of tluj 

 genus Notothenia \\\ the two regions of Kerguelen on the one 

 hand and Soutii Georgia and Graham Land on the other:)". 



It seems only fitting that one of the species of Serolis 

 should bear the name of the author to whom we owe the 

 ' Challenger'' monograph of tlu^ genus. 



* Arch. Naturg. xlv. (1) 1870, pi. iii. tig. 20. 



t The type-spocimeiniamed by Wliite and described by Miors is stated 

 to have come from the AucMaiid Islands (Rendezvous Cove), but the 

 species lias not since been recorded from that locality. As the specimen 

 reached the ^luseum in a collection comprising others from Kerguelen 

 {e. /7., the types of S. quadricarinata), there may possibly have been some 

 confusion of localities. 



X Regan, Fishes Brit. Autarct. (' Terra Nova ') Exp. 19U, p. 30. 



