222 PROCEEDINGS OF THE ACADEMY OF [ApHl^ 



Eulalia longicornuta sp. nov. Plate X, figs. 7, 8. 



A complete example, much contracted, measures 15 mm. in length, 

 with a body width of 1.5 mm. at the widest part, and a total of 73 

 segments. 



The broad prostomium is very slightly cordate, about as wide as 

 long, and has no distinct concavity or constriction behind the frontal 

 tentacles. The latter arise from the extreme anterior end of the 

 prostomium, are slightly longer than the head and very slender. The 

 median tentacle arises immediately in front of a line connecting the 

 anterior border of the eyes or very close to the centre of the 

 prostomium. It is If times as long as the head, very slender, and 

 tapers regularly from the base to the tip. 



The single pair of eyes are circular, black, situated nearly their 

 diameter from the posterior margin of the prostomium and twice 

 their diameter from each other. Both specimens have the proboscis 

 retracted, in which condition the mouth is bounded below by a some- 

 what swollen, longitudinally furrowed lip. The peristomial somite 

 appears on the dorsum as a slightly elevated lenticular area overlapping 

 the prostomium. The first ventral tentacular cirrus arises directly 

 beneath the eye, the second one from somite II ; both are slender and 

 subulate and reach back to somite VII or to a length 2+ times the 

 head. The two dorsal tentacular cirri arise from II and III respect- 

 ively, and are about twice the length of the ventral cirrus, very slender 

 and regularly tapered to a delicate tip. 



Dorsally the body is strongly arched above, below flattened and 

 slightly grooved. It is widest at the middle and tapers regularly and 

 nearly equally both ways. The segments are well marked throughout 

 and show scarcely a trace of biannulation, even posteriorly. The 

 anal cirri are missing from both type and cotype. 



Although the specimens are smaller, the parapodia (fig. 7) are even 

 more prominent than in E. quadrioculata, owing to the projecting 

 character of the dorsal angle of the presetal lobe, but otherwise they 

 are similar. The dorsal cirri are, however, very different from those 

 of that species, being folded against the sides of the body instead of 

 held erect. They are strongly fohaceous throughout, the anterior 

 and middle ones having a broadly pyriform outline, and those of the 

 latter region being especially broad ; the posterior ones are more slender 

 and rather cuneate-ovate. Moreover, the central area is always broad 

 and thick and the gland ducts and other markings radiate from it in 

 all directions and not in a pinnate manner. The ventral cirrus is also 

 prominent and projects beyond the dorsal lobe of the parapodium. 



