l8 DISCOVERY REPORTS 



Family ALCIOPIDAE 

 Exclusively pelagic. Body elongate with numerous segments; exceptionally short and wide. Pro- 

 stomium small with two very large eyes, and normally with five antennae. Three or five pairs of tenta- 

 cular cirri. Proboscis eversible, sometimes with two long anterior cirriform appendages, always with 

 papillae, rarely with chitinous teeth. Parapodia uniramous with dorsal and ventral cirri, pedal lobe, 

 simple and/or compound chaetae, and normally with pigmented segmental glands. In the female, 

 anterior dorsal cirri may be modified into seminal pouches. Anal cirri present. 



Genus Naiades Delle Chiaje, 1830 

 Body elongate with the prostomium carrying five antennae. There are three pairs of tentacular cirri 

 and the first three pairs of parapodia are reduced. Proboscis bell-shaped with two short anterior 

 cirriform lobes, between which are small papillae. Parapodia with simple chaetae only; the pedal lobe 

 is without an appendage. 



Type species. Naiades cantrainii Delle Chiaje, 1830. 



Type locality. Naples. 



Stop-Bowitz (1948) has demonstrated the necessity for replacing the long accepted generic name 



Alciopa with Naiades. p .. . . 



Naiades cantrainii Delle Chiaje, 1830 



Naiades cantrainii Delle Chiaje, 1830, pi. 82, figs. 14, 18, 21. 



Alciopa Reynaudi Krohn, 1845, PP- l 7^3> P 1 - vi > fi g s - I_6 > nec Aud - and M> Edwards - 



Alciopa Edwardsii Krohn, 1847, pp. 39-40. 



Alciope Edwardsii Grube, 1850, p. 305. 



Krohnia Edwardsii Quatrefages, 1865, p. 158. 



Alciopa Edwardsii Ehlers, 1868, p. 176. 



Alciopa Cantrainii Claparede, 1870, pp. 469-71, pi. 10, fig. 2. 



Alciopa Cantrainii Greeff, 1876, pp. 57-60. 



Alciope cantrainii Viguier, 1886, p. 404. 



Alciope microcephala Viguier, 1886, pp. 404-5, pi. 26, figs. 1-5. 



Alciopa cantrainii Apstein, 1891, p. 128. 



Alciopa Cantrainii Apstein, 1900, p. 7, pi. 5, fig. 53. 



Alciope cantrainii Ehlers, 1913, p. 464. 



Alciope Cantrainii Fauvel, 1916, pp. 64-5. 



Alciopa Cantrainii Fauvel, 1923, pp. 203-4, fig. 76. 



Alciopa cantrainii Monro, 1930, p. 84. 



Alciopa cantrainii Monro, 1936, p. 115. 



Alciopa cantrainii Wesenburg-Lund, 1939, pp. 25-8, fig. 19. 



Naiades Cantrainii Stop-Bowitz, 1948, pp. 24-5, figs. 15-16. 



Description. This species may measure up to no mm. in length by 8 mm. wide across the tips of 

 chaetae, but complete specimens are not common. The body is sharply terminated anteriorly with 

 the eyes projecting prominently forward with the small prostomium between them. There are two 

 pairs of small anterior antennae and one small unpaired median antenna on the dorsal surface between 

 the eyes. The first pair of tentacular cirri are long, the remaining two very small. The first three pairs 

 of parapodia are much reduced with small lobes and no chaetae but with aciculae; in the female the 

 dorsal and ventral cirri of the second pair are modified as seminal pouches. Subsequent parapodia up 

 to the end of the body each have a large foliaceous dorsal cirrus, a smaller ventral cirrus, a prominent 

 projecting acicula, long simple chaetae and a strongly pigmented dorsal segmental gland. 



General distribution. N. cantrainii is widely reported from the South Atlantic where it has its 

 southern limit of distribution at the Sub-Tropical Convergence (see p. 257). 



