122 BULLETIN 2 01, UNITED STATEIS NATIONAL MUSEUM 



Genus GIBBERYTHROPS Illig 

 Gibberythrops Illig, 1930, p. 431. 



GIBBERYTHROPS ACANTHURA (Illig) 



Parerythrops acanthura Illig, 1906a, p. 197, fig. 4. 



Gibberythrops acanthura Illig, 1930, p. 431, figs. 51-54. — Tattebsall, 1939a, 



p. 244. 

 Erythrops acanthura Coifmann, 1936, p. 32, pi. 15, figs. 21a-b ; pi. 16, figs. 21c-f. 



Occurrence. — Philippine Islands: Albatross stations 5288, 3 fe- 

 males, 5 to 7 mm. ; 5500, 2 females, 6 mm. 



Distribution. — Hitherto this species has been recorded only from the 

 Indian Ocean, Ceylon, and at the entrance to the Red Sea (Illig), Red 

 Sea (Coifmann) , and the Arabian Sea and Gulf of Aden (Tattersall) . 

 The Philippine records therefore mark a considerable extension of its 

 known geographical range. It is probably widely distributed in the 

 deeper waters of the Pacific and Indian Oceans. 



Remarks. — All the specimens are females and appear to agree very 

 closely with Illig's description and figures. The material is not in very 

 good condition. Most of the thoracic limbs have been broken off and 

 I am unable to add anything to Illig's account. 



GIBBERYTHROPS PHILIPPINENSIS, new species 



Figure 41 



Description. — Thorax (fig. 41, a) in front of the cervical groove 

 moderately vaulted in shape in lateral view (fig. 41, b) as in the type 

 species, G. acanthura; front margin of the carapace (fig. 41, a) broadly 

 and evenly rounded forming a narrow somewhat upturned rim to the 

 thoracic region and leaving the eyes and eyestalks wholly uncovered. 



Eyes (fig. 41, a) somewhat larger than in G. acanthura, more or less 

 globular in shape, cornea as wide as the stalk, no ocular papilla. 



Antennal scale (fig. 41, c) three times as long as broad at its widest 

 part, shorter than the antennular peduncle, proximal three-quarters 

 of the outer margin entire and terminating in a strong spine, beyond 

 which the scale is produced as a terminal lobe, slightly longer than 

 broad at its base; antennal peduncle about three-quarters of the 

 length of the scale, its three joints more or less subequal in size; the 

 setae fringing the scale are very long, as long as or longer than the 

 scale. 



Sixth somite of the abdomen more than twice as long as the fifth. 



Telson (fig. 41, d) three-fifths as long as the sixth somite of the 

 abdomen, narrowly triangular in shape, twice as long as broad at the 

 base, narrowing evenly to a narrow apex armed by a pair of long 

 spines equal in length to one-tenth the length of the telson; lateral 



