24 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Gaidius robustus (Sars, 1905) 



Figures 60-64 



Gaetanus robustus Sars, 1905a, pp. 11-12. 



Gaidius maximus Wolfcnden, 1906, p. 35, pi. 11, figs. 1, 2. 



Gaidius validus Farran, 1908, pp. 32-33, pi. 2, figs. 11-17. 



Mesogaidius maximus (Wolfendcn). — Wolfenden, 1911, pp. 224-226, pi. 26, 



figs. 3-6, text-fig. 13. 

 Pseudogaetanus robustus (Sars). — Brodsky, 1950, pp. 168-169, fig. 86. 

 not Gaidius robustus Vervoort, 1949, pp. 12-15, figs. 5, 6. 



Remarks: Vervoort (1952a, 1952b) redefined the genera Gaidius 

 Giesbrecht and Gaetanus Giesbrecht. Accordingly, the species Sars 

 described in 1905 as Gaetanus robustus is here transferred to the genus 

 Gaidius. Brodsky (1950) proposed a new genus, Pseudogaetanus, 

 for this species. In our opinion, the characters given are insuflScient 

 for the erection of a new genus. 



The paratype of Gaidius robustus Vervoort was kindly loaned to 

 us for examination. We concur with Dr. Vervoort (in litt.) that the 

 specimen is actually referable to G. intermedius Wolfenden, the latter 

 species name having priority. 



Gaidius robustus (Sars) has not previously been reported from 

 the Indian Ocean. 



Pseudochirella gibbera Vervoort, 1949 



Remarks: None of the specimens had a spine on the right dorsal 

 side of the fifth thoracic segment as described by Vervoort (1949) in 

 the original description of the species. Our specimens varied in 

 total length from 5.83 to 6.17 mm. Vervoort's single specimen 

 measured 5.50 mm. The species has not been reported from the 

 Indian Ocean. 



Pseudochirella squalida, new species 



Figures 65-70 



Occurrence: Station 35 IB IK, 350 to 1710 m, 1 9. 



Diagnosis (female) : Rostrum strong and directed ventrally. Fifth 

 thoracic segment rounded. First antenna reaches furca. Second 

 endopodal segment of second antenna with seven setae on outer lobe 

 and nine setae on inner lobe. First basal segment of fourth foot with 

 six coarse spines. Genital segment slightly asymmetrical and hairy. 

 Small rounded protuberances on each side. Total length 5.66 mm. 

 Holotype: USNM 113517. 



Remarks: This species resembles P. obesa Sars but may be dis- 

 tinguished from it by the protuberances on the genital segment. The 

 genital segment of P. obesa has neither protuberances nor hair. 



