Rev. Canon A. M. Norman on British Mysidaj. 2t9 



Czerniavsky's Ilemimysis pontica altogctlier agrees witli 

 not quite mature specimens of this species. 



nah. Falmouth, Plymouth {A. M. N.) ; Banff {T. Ed- 

 ward) ; Seaham, co. Durham {G. Hodge) ; Loch Goil [D. 

 Rohertson) ; Tarbert, Loch Fyne, and Firth of Forth {T. 

 Scott) : Mus. Nor. Port Glasgow (D. Rohertson) ; Colwyn 

 Bay, N. Wales {A. 0. Walker). 



Distribution. When I was at the Zoological Station at 

 Naples I found this species, which had been previously sent 

 to me from the station, breeding in immense numbers in the 

 tanks. Suchum, Black Sea ( Gzerniavshy) ; Norwegian 

 coast from Christiania to Lofoten {G. 0. Sars) ; West 

 ISweden {Goes) ; Denmark {Meinert). 



Genus 9. Macropsis, G. O. Sars. 



= Podopsis, Vau Beneden &c. {? Th.ora])soi\), = Parapodopsis and 

 Mesopodopsis, Czerniavsky (subgenera). 



Animal very slender ; cephalothorax much narrower in 

 front than behind ; carapace leaving the two hind segments 

 uncovered, and the central portion of the antepenultimate ; 

 in front the rostral portion is slightly produced, rounded, its 

 external angles with a well-developed spine. Antennides 

 with greatly produced peduncles; antennal scale subulate, 

 ciliated all round. Eyes enormously developed, being elevated 

 on very long and nearly cylindrical stalks, so that the total 

 length of the eye is much greater than the breadth of the 

 front portion of the carapace. Legs subequal in length, tarsus 

 multiarticulate, no nail. Ttlson very short, basal portion 

 subquadrate, and the apex triangularly produced and serrated 

 beyond the distal spines of the lateral margins. 



Male. — Antennules terminating with the usual two fila- 

 ments, and having besides a very large hirsute lobe (as usual 

 in male Mysidai) and a fourth appendage consisting of a long 

 narrow, conical, basal process, to the distal extremity of 

 which is attached a single very long seta. Third pleopods 

 consisting of a large basal joint and two branches, the inner 

 and larger of one joint, ciliated on the inner margin, the outer 

 much smaller, of two joints. Fourth pleopods greatly deve- 

 loped and very like in general form to those of Schistoniysis 

 ornata : basal joint very long, with two branches — inner 

 minute, one-jointed, with a lateral lobe at the base ; outer 

 consisting of three articulations, the second very long, and 

 third short and terminating in two flagella, outer long, many- 

 jointed, inner about one fourth its length, not jointed. 

 Ann. c& Mag. N. Hist. Her. 6. Vol. x. 17 



