Contributions to the Crustacean Fauna of South Africa. 373 



IKONA MELANOSTICTA, Schioedte & Meinert. 



1884. Irona melanosticta, Schioedte & Meinert, I.e. p. 388, pi. 17, 



figs. 3-5 ( ? ). 

 1910. ,, ,, Thielemann, Abh. Ak. Wiss. Munich, 



2 Suppl. Bd. 3 Abt. p. 45, pi. 2, 



figs. 28, 29. 



The agrees well with the original description except in a few 

 particulars. The epimera are scarcely subpendulous or declivous 

 on the right, on the left side not at all so, but continued in the 

 same plane as the segments ; the epimera of segments 2 and 3 are 

 the narrowest, that of 4th segment much the largest, those of 

 segments 5-7 intermediate in size. The uropods are not shorter 

 than telson, but the inner ramus extends a little, the outer for 

 nearly half its own length, beyond the telsonic apex. Both pairs 

 of antennae are S-jointed, the division between peduncle and 

 flagellum indistinct. Peraeon segments, except 1st, with an obscure 

 median depression ,on anterior margin, deepest on the 2nd-4th 

 segments. The specimen is curved to the right. 



The 3 is more symmetrical, the head proportionately larger, 1st 

 peraeon segment longest, the rest subequal. Antero-lateral angles 

 on 2nd and 3rd segments not marked off by oblique grooves as in 5 . 

 Epimera pendulous, those of 2nd and 3rd segments deepest, 

 posterior margins truncate, that of 4th segment small, those of 5th- 

 7th segments subequal, posterior margins rounded. First and 

 lateral portions of 2nd pleon segments concealed, posterior margin 

 of 5th segment not sinuous. Telson almost as long as broad, apex 

 broadly rounded. 



First and second antennae 8-jointed, peduncle and flagellum not 

 distinct. 



Upper lip very faintly ernarginate, not 4-lobed as in I. nanoidcs, 

 Stebbing. 



Mandibles, palp stout, 1st and 2nd joints subequal, 3rd small, all 

 joints without setae. 



First maxilla, apex with 3 spines, but the other two appear to 

 have been broken off. 



Second maxilla, apex of trunk apparently with 2 small lobes each 

 bearing 3 hooked spines. 



Maxilliped, 2nd joint 2^ times as long as broad, inner margin bent 

 inwards at right angles to outer surface, 3rd joint ^ as long as 2nd, 

 4th joint half length of 3rd, apex with 3 hooked spines. 



First and second pleopods, outer ramus broader but not so long 



29 



