ISO 



DISCOVERY REPORTS 



Genus Onuphis, Audouin and Milne-Edwards 



Two cushion-like palps, two short frontal tentacles, and five occipital tentacles borne 

 on ringed tentaculophores. A pair of tentacular cirri is present. Gills simple or pectinate, 

 sometimes absent. Pseudo-compound bristles in a few anterior feet, followed by 

 capillary, acicular and comb-chaetae. Upper jaw with mandibles and toothed plates of 

 which one is unpaired. 



Branchiae simple, cirriform 

 Branchiae pectinate 

 Branchiae beginning on ist foot 

 Branchiae beginning about the loth foot 

 Branchiae beginning about the 2nd foot 

 Branchiae beginning about the 6th foot 



2 



3 



O. iridescens 



O. conchylega 



O. aucklandensis 



... O. dorsalis 



Onuphis conchylega, Sars. 



Fauvel, 1923, p. 415, fig. 164 a~m. 

 Occurrence. St. 159 (i); WS 237 (2). 



Specific characters. Branchiae simple, cirriform, beginning about the loth foot. 

 First two feet enlarged and directed forwards. They are provided with large simple 

 hooks, and the 3rd foot has pseudo-compound unidentate or bidentate crochets. 

 Comb-chaetae are present from the 2nd foot. Ventral cirrus absorbed at the 3rd foot. 

 Cirriform postchaetal lip disappearing at about the 14th chaetiger. 



Remarks. I have compared these examples with some specimens of this species 

 from off the north of Scotland and they are undoubtedly conspecific. Augener (1931, 

 pp. 295-8) has reviewed the types of the species of Onuphis described by Kinberg from 

 the South Atlantic. O. verngreni is a Rhamphobrachhim; the type of O. setosa has dis- 

 appeared and that of O.fragilis is not well enough preserved to be determinable. Both 

 O. setosa and O.fragilis are described as having "branchiae cirrosae" and I strongly 

 suspect them both of being the same as O. conchylega, but under the circumstances 

 Kinberg's names had better be dropped. 



Onuphis iridescens (Johnson). 



Northia iridescens, Johnson, 1901, p. 408, pi. viii, figs. 86-87; P'- i^i ^gs. 88-92. 

 Monro, 1930, p. 132. 



Occurrence. St. WS 212 (5). 



Specific characters. A slender, elongate, pearly white species. The single complete 

 specimen measures 114 mm. by 2 mm. for 190 chaetigers. The tentacles are long and 

 the inner pair of occipitals reaches back to the 8th or 9th chaetiger. The gills begin on 

 the first foot and are continued to between the 20th and 40th chaetiger from the end of 

 the body. They are single and cirriform throughout. The gills attain the same size as 

 the dorsal cirrus at about the 5th foot and after that gradually increase in length 

 relatively to the dorsal cirrus. The post-chaetal lip of the foot disappears at the 12th 

 chaetiger and the ventral cirrus is absorbed at the 6th. 



