Schizopoda colleclcd in the Antarctic Rmjion. ') 



the antenmilar pi (liinclt' ; lateral inarf^ins with a siii^'h; 

 rather proiiiiiiiut deiitich', |)osterior to tlje iiiiildle. I'Icnn 

 with the third, fourth, and filth segments produced posteriorly 

 into rather long, slender, very aeutc, and slightly curved 

 median spines ; sixth segment nearly twice as long as the 

 fifth without the spine. Eyes (dauiagcd in tin; specimen) 

 apparc-ntly rather small. Antennnlur jwdnncle with a soine- 

 wliat recurved l>ilid laj)pet at the inner distal angle ot the 

 extremity of the iwsi joint ; second joint with a single pointed 

 lappet. Anttnnul scale broad, extending to the end of the 

 second joint of the antcnnular peduncle ; outer edge ttr- 

 minating in a spine ; apex ohtuscly rounded. Preanal spine 

 small and ^implc. Telson with acutely j)roduced and smooth 

 apex ; suba|)ical spines smooth ; dorsal denticles in two 

 pairs, the first at about two thirds of the distance from base 

 to subapical spines, tlie second just above the spines. Uro- 

 pods subequal in length, extending to about the insertion of 

 the subapical spines. 



Ltnytli of tlie single specinu^n 23 mm. 



Locality. Lat. (\{? 52' 9" 8., long. 17b° 8' 1.')" K. 

 Soundings 2030 fath. 



Thysanoessa macrura, G. O. Sars (1885). 



Numerous specimens, of which the largest reach a length 

 of 28 mm., were taken both in tlie open sea and through 

 holes in the ice. While agreeing in all other respects with 

 Sars's description they almost all have elongate legs pro- 

 portionally much longer, the merus extending to about the 

 end of the antcnnular peduncle, instead of " scarcely reaching 

 beyond the middle of antcnnal scale." This dili'erencc is 

 not related to the size of the individuals, since it is equally 

 manifest in specimens of the same size as Sars's types 

 (13 mm.) and in larger forms. Two specimens alone agree 

 in the proportional leugih of these legs with the types. 

 There is no other distinction and it seems to us probable 

 that the shorter-legged examples, including the type, have 

 at some period lost their elongate limbs, which have been 

 rejjlaccd, as is usual in the higher Dccapoda, by smaller 

 members. We have figured (1903, pi. xv. fig. 2) a Thyan- 

 uocssa in which one of the same legs is seen in an early 

 stage of regeneration. Stebbing's record of 7'. inacrura 

 (1900) refers to a specimen in which the legs are longer 

 than in the type. 



