408 Annals of the South African Museum. 



Pleopod 1 in $ , the two peduncles closely united throughout their 

 length but with a distinct suture, rami distinct, slightly diverging, 

 apically rounded, a small tooth on outer margin. 



Operculum in $ broader than long, evenly rounded, margin sparsely 

 setose, surface scabrous. 



Pleopod 2 in <-, peduncle ovate, tapering to a subacute apex, 

 inner margin nearly straight, minutely serrulate distally, inner ramus 

 (stylet) geniculate, 1st joint short, 2nd reaching to apex of peduncle, 

 swelling out in middle, apically blunt. 



The other pleopods as figured for H. bicusjns. 



TJropod uniarticulate, setose. 



Length: 2'5 mm.; breadth: 1 mm. 



Colour : In spirit chalky white. 



Locality: Cape Point, N. 89 E., distant 36 miles. 700 fathoms. 

 Bottom green mud. Several $ <$ and ovigerous ? $ . s.s. " Pieter 

 Faure/' 20/8/03. (S.A.M. No. A4069.) 



The specific name referring to the marked difference between the 

 peduncle and flagellum of antenna 2, sharply distinguished from all 

 the other species by antenna 2. 



In this species the degree to which the postero-lateral angles of 

 the pleon are produced differs in. the two sexes, the $ resembling 

 H. bicuspis (of which only the $ is known), the $ resembling 

 H. retros2)inis. Of the latter both sexes are known but there is no 

 sexual difference. 



FAMILY MUNNIDAE. 



1882. Hunnidae Sars, Vidensk. Forhl. Christ. No. 18, p. 17. 



1897. G-. O. Sars, Crust, Norw. vol. 2, p. 105. 



1905. Richardson, Bull. U.S. Nat, Mus. No. 54, p. 479. 



GEN. PAEAMUNNA Sars. 



1866. Paramunna G. O. Sars, Beretu. Zool. Reise ved. Kyst. Christ. 



p. 31. 



1897. id. I.e. vol. 2, p. 111. 



1910. Stebbing, Gen. Cat. S.A. Crust, p. 435. 



Stebbing in 1910 described P. laevifrons from South Africa, thereby 

 reducing the character of the bilobed head, which Sars regarded as 

 of generic value, to specific value. Tattersall had in 1905 (Fish. Irel. 

 Sci. Inv. 1904, 2, p. 18) instituted the genus Metamunna to include 

 a form also without frontal lobes, but which possessed certain features 

 akin to Pleurogonium Sars. As he did not dissect out the mandibles 



