418 Annals of the South African Museum. 



Operculum in $ reaching to apex of pleon, nearly circular when 

 flattened out, but in the natural position folded longitudinally, roof- 

 like. 



Pleopod 2 in reaching to apex of pleon, peduncles large, semi- 

 circular, fused along the straight inner margins but with distinct 

 suture, in natural position folded longitudinally, roof-like, slightly 

 diverging distally where the short, geniculate, apically subacute inner 

 rami (stylets) are inserted, the rami not projecting beyond the apices 

 of the peduncles. 



Uropod slender, uniramous, 2nd joint a little longer than 1st. 



Length: (J 3'5 mm., $ 4 mm.; breadth: across anterior part of 

 body ( 1 mm., $ 125 mm. Another $> measures 5'5 x 1'5 mm. 

 and the anterior half of another (ovigerous) ? measures 2 x 2 mm. 



Colour : In spirit pinkish-white. 



Locality: Cape Point N. 89 E., distant 3G miles. 700 fathoms. 

 Bottom green mud. 2 $ > 3 ? ? , 2 fragments, s.s. " Pieter Faure." 

 20/8/03. (S.A.M. No. A4068.) 



Geogr. Distribution : W. coast of Ireland, 199382 fathoms (Tatter- 

 sail) ; Davis Strait, 1435 fathoms and Faroe Is., 463-515 fathoms 

 (Hanseu). 



GEN. ILYAEACHNA Sars. 



1863. Mesostenus G. O. Sars, Chr. Vid. Selsk. Forlil. 1863, p. 211 



(nom. preocc.). 



1870. Ilyarachna id. Christ. Fjord. Dybvands Fauna, 1869, p. 44. 

 1886. Beddard, Challeng. Eep. vol. 17, p. 76. 



1896. Bonnier, Ann. Univ. Lyons, vol. 26, p. 608. 



1897-8 Sars, Crust. Norw. vol. 2, p. 134. 



1901. Ohliu. Bih. Sv. Vet. Akad. vol. 26, pt. 4, No. 12, 



p. 37. 



1905. Tattersall, Fish. Irel. Sci. Inv. 1904, ii, p. 28. 



1911. Kichardson, Bull. Mus. d'Hist. Nat. Paris, 1911, 



No. 7, p. 533. 

 1914. Vanhuffeu, Deutsche Siidpol. Exp. vol. 15, pt. 4, 



p. 591. 



ILYAKACHNA AFFINIS n. sp. 



Body smooth, glabrous. Head broader than long, with a transverse 

 ridge on both anterior and posterior margin, Peraeon segments 1-3 

 subequal, 4 longer distally, its anterior margin curved forwards, 

 antero-lateral angles, especially those of segment 2, acute, segments 



