186 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



The peculiar marking on the surface of the elytra recalls the struc- 

 ture of the elytra of L. pellucida Moore, from Bering Sea. 5 

 Type.— Cat. No. 19206, U.S.N.M. 



Family ACOETIDAE 



Genus EUPANTHALIS Mcintosh 



EUPANTHALIS EVANIDA, new species 

 Figures 6 to 12 



Two specimens were collected at Station D 5526, between Siquijor 

 and Bohol Islands, 9° 12' 45" N., 123° 45' 30" E., August 10, 1909, 

 805 fathoms, one the holotype, bears Cat. No. 19208 IT. S. N. M. 

 Neither is entire, each retaining only about the anterior 50 somites. 

 Apparently through the action of the preserving fluids all color has 

 been lost even in the eyes which are recognizable only because of their 

 form. 



The prostomium of the type has a width of 1 mm. Following so- 

 mites successively increase up to the region of the eighth, which 

 measures approximately 5 mm. There is posteriorly a gradual de- 

 crease in diameter so that somite 50 is hardly more than 2 mm. in 

 width. 



The prostomium (fig. 6), is rectangular in general outline, its 

 breadth being only twice its length. The posterio-lateral angles are 

 rounded, while the anterio-lateral ones are continued into the large 

 sessile eyes which are distinguishable only by their form, any trace 

 of pigment which might have been originally present having been 

 lost. The ceratophore of the median tentacle arises near the poste- 

 rior margin of the prostomium and extends to about the base of the 

 eye stalks. The terminal joint is slender and tapering and extends 

 about one-half its length beyond the eyes. The lateral tentacles arise 

 from the extreme ventral face of the prostomium. They have about 

 the same diameter as the median tentacle but are somewhat longer. 

 The palps are slender but long and tapering, six or seven times as 

 long as the prostomium. The dorsal tentacular cirrus is about one- 

 half as thick and one-third as long, as the palp. The ventral tentacu- 

 lar cirrus is similar in form to the dorsal but smaller. 



The first parapodium has a tuft of very slender setae arising just 

 ventral to the tentacular cirrus. The second has a notopodium in the 

 form of a rounded knob into which an acicula extends and a much 

 larger neuropodium with rounded presetal and pointed postsetal lips. 

 The acicula nearly reaches the surface between the lips. Dorsally 

 there is an elytrophore and ventrally a cirrus which is much longer 

 than the setal lobes. (Fig. 7.) 



6 Moore, J. Percy : Polychaeta from the Coastal Slope of Japan and from Kainschatka 

 and from Bering Sea, Proc. Acad. Nat. Sci. Philadelphia, 1903, vol. 55, p. 422. 



