NO. 3576 AMPELISCIDAE — BARNARD 15 



these uropods which are suggestive of the following species of Am- 

 pelisca: lohata Holmes (females only), bidentata Schellenberg, sca- 

 bripes Walker, and excavata K. H. Barnard. From the literature, 

 those species appearing to resemble B. ampelisciformis in their third 

 uropods are B. antarctica Schellenberg (1931) which lacks corneal 

 lenses and has a large distal protrusion on article 5 of pereopod 3, 

 and B. subantarctica Schellenberg (1931) which has a very distinctive 

 pereopod 5, no ventral lenses, and which is transferred to Ampelisca. 

 Distribution: Honshu Island, Japan, 128-228 m. 



Byblis orientaliSf new species 



Figure 4 



Diagnosis of male: Rostrum vestigial, anterior cephalic margin with 

 small protrusion, anteroventral cephalic margin with short, regular 

 excavation for reception of antenna 2; two pairs of corneal lenses of 

 medium and subequal size, ventral pair pointing anterolaterally, 

 situated at and forming rounded anteroventral cephalic angle; antenna 

 2 as long as body, antenna 1 reaching about three-fourths along article 



5 of antenna 2, article 2 of peduncle almost twice as long as article 1 

 and slightly more than one-thu-d as long as peduncular article 4 of 

 antenna 2; anterior coxae unserrate ventrally, coxa 4 of medium 

 width, not truncate ventrally but posteroventral margin beveled and 

 posterior tooth therefore very slender; pereopods 1-2 scarcely dis- 

 proportionate in size, dactyls shorter than their respective sixth 

 articles; pereopods 3-4 without special modifications, article 2 of 

 pereopod 5 with typical overall shape, but neither as strongly expanded 

 nor as ventrally extended as in many species of Byblis, articles 5 and 



6 equal in length, article 7 about half as long as article 6; uropods 1 

 and 2 of normal proportions, distolateral end of uropod 1 peduncle 

 with stout spine, of uropod 2 with weakly hooked cusp, spines of 

 peduncles and rami of normal size; uropod 3 typically forcipiform, 

 apposing margins of rami weakly serrate; telson of medium length, 

 cleft about one-thu'd. 



Remarks: Mouthparts are like those of B. gaimardi (Kr0yer) (in 

 Sars, 1895, pi. 64) except for the expanded article 2 of the mandibular 

 palp and the stouter spines of the outer plates of the maxillipeds. 

 Article 2 of pereopod 5 is covered medially with setae. Male antennae 

 lack setal tufts on the peduncles. The holotype has the best developed 

 dorsal subcrest on urosomite 1 of any of the specimens. The anterior 

 cephalic protrusion is also best developed on the figured holotype. 



Female: Antenna 1 extending along antenna 2 only about 2 flagellar 

 articles beyond article 4. 



Holotype: USNM 111274, male, 11.0 mm. 



