14 



3. Iphinoe trispinosa, (Goodsir). 



(PI. V & VI.) 

 Cuma trispinosa, Goodsir, Edinburgh New Phil. Journal 1843, Vol. XXXIV, p. 126, PI. Ill, figs. 17. 



Syn: Halia trispinosa, Sp. Bate. 



Venilia gracilis, Sp. Bate (male). 



Cyrianassa gracilis, Sp. Bate (male). 



Iphithoe trispinosa, Norrnan. 



Iphinoe gracilis, Meinert. 



Specific Characters. Body in both sexes extremely slender and elongated. 

 Carapace in female scarcely longer than the exposed part of the trunk, its upper 

 edge somewhat elevated in the middle, and at this place armed with 3 or 4 

 closely-set denticles; pseudo-rostral projection rather prominent, horizontal and 

 acutely produced at the tip, antero-lateral corners triangular. Carapace of 

 male quite smooth above and having the antero-lateral corners blunted. 1st pe- 

 digerous segment partly covered at the sides by the succeeding segment, its 

 dorsal part, however, quite conspicuous. Tail, not including the uropoda, longer 

 than the anterior division. Eye in male much more fully developed than in 

 female, with the corheal lenses exceedingly prominent. Superior antenna? with the 

 last joint of the peduncle almost twice as long as the preceding one, outer fla- 

 gellum very short, uniarticulate, inner much smaller, but distinctly biarticulate. 

 Inferior antennas of male equalling the body in length. 3rd pair of maxillipeds 

 with the basal joint about twice the length of the succeeding joints combined, 

 outer expansion of ineral joint with about 10 plumose seta?. 1st pair of legs 

 scarcely longer than the carapace, basal joint about the length of the succeeding 

 joints combined; 2nd pair of legs shorter than the 3rd, its last joint about the 

 length of the 2 preceding joints combined; this pair, as also the 3 posterior ones, 

 rather abundantly supplied with bristles. Uropoda with the basal part in female 

 armed with about 10 spinules, in male with numerous short ciliated bristles; inner 

 ramus a little shorter than the outer, its proximal joint scarcely half the length 

 of the distal one, and armed inside with 5 spines, the outermost of which is 

 rather strong. Body straw-coloured, without any distinct pigmentary ornament. 

 Length of adult female reaching to 10 mm., that of male somewhat less. 



Remarks. The female of this species was first described by Goodsir as 

 Cuma trispinosa, and subsequently included by Sp. Bate in his genus Halia, after- 

 wards changed to Iphinoe. Sp. Bate also observed the adult male, but did 

 not recognise it as such, describing it as the type of a new genus under the 

 name of Venilia (Cyrianassa) gracilis. A very closely-allied species was estab- 

 lished by Norman as /. serrata. Of this form, a detailed description with 



