14 U.S. NATIONAL MUSEUM BULLETIN 2 60 



Argissidae 



Argissa Boeck 



Argissa ^hamatipes (Norman) 



Figure 1 d-i 



Syrrhoe hamatipes Norman, 18G9, p. 279. 



Argissa typica Boeck. — Sars, 189.5, pp. 141-142, pi. 48 (with synonymy) . 



f Argissa Stcbbingi Bonnier, 1896, pp. 626-630, pi. 36, fig. 4. 



Argissa hamatipes (Norman). — Stebbing, 1906, p. 277 (with synonymy). — Shoe- 

 maker, 1930, pp. 37-40, figs. 15, 16.— Stephensen, 1935, p. 140.— Gurjanova, 

 1951, pp. 327-328, fig. 193.— J. L. Barnard, 1902c, p. 151 ; 1966a, p. 61. 



A single male, 4.7 nim long, resembles the figures of Argwsa liama- 

 tipes published by Sars (1895) in the following characters: general 

 aspect, antennae, pleonal epimera, uropods, all coxae but the third, 

 gnathopods, all portions of the pereopods except article 4 of pereopods 

 3 and 4, mandibular body, maxilla 2, all portions of the maxilliped but 

 palp article 4, telson and lower lip. The specimen at hand differs 

 from Sars' figures in having only one seta on the inner plate of maxilla 

 1, a longer and more slender mandibular palp, a rounded, not subacute 

 coxa 3, no eyes, no posterior setae on article 4 of pereopods 3 and 4, 

 a broader first maxillary ftalp with two subserrate, three bifid and 

 one serrate spines distally (see figures herein), and a maxillipedal 

 palp article 4 having a distal spine scarcely longer than the article. 

 Coxa 3, maxillipedal palp article 4 and the first maxillary palp all 

 resemble those of Argissa stebhingi and the mandibular palps are in- 

 termediate in length between those of A. hamatipes and A. stebhingi. 

 The male at hand is not as fully mature as are those males shown 

 by Sars and Bonnier, the urosomal teeth being short, the third uropod 

 being poorly setose and the basal flagellar articles of antemia 1 being 

 poorly armed. 



The lobulated anterior cephalic crest and epistome of A. hamatipes 

 were not illustrated by Sars and no comparison can be made with 

 those of the specimen at hand. But the anterior crest resembles that 

 of A. stebbingi except for the rounded, not subacute epistome. An- 

 other specimen of A. hamatipes^ 2.6 mm long, from the coastal shelf of 

 southern California, has a similar anterior crest but it is weakly de- 

 veloped in comparison to that of the deep-water specimen and A. steb- 

 bing i. "VVliether it resembles that of Atlantic shallow- water A. hama- 

 tipes is unknown. Shallow-water jDopulations of A, hamatipes from 

 California also lack posterior setae on article 4 of pereopods 3 and 4, 

 resembling the deep-water specimen. 



If the following suppositions prove to be correct then A. stebbingi 

 and A. hamatipes should be merged : (1) Probably the very thin man- 



