EUPHROSYNE PANAMICA. 33 



EUPHROSYNE PANAMICA, sp. nOV. 



Plate 12, fig. 7, 8; Plate 13, fig. 1-7. 



The general color of the type is at present yellowish gray. 



The body in outline is oblong with the anterior end rounded; narrower 

 from the middle caudad, with the caudal end also rounded; the sides of the 

 anterior region between the middle and the convex anterior end are straight 

 and parallel or nearly so. The total length of the type is nearly 14 mm. and 

 the greatest width over all 6.5 mm. The number of setigerous somites counted 

 in the type is thirty-five. The naked median dorsal stripe is narrow, being 

 only about one sixth the total width in the median region or one fourth excluding 

 the setae. The stripe is smooth. 



The caruncle is a slender smooth finger-like or cirriform process projecting 

 freely caudad, crossing the fifth somite and in the type touching the anterior 

 border of the sixth. It is acuminate caudad. The unpaired tentacle presents 

 the usual slender, thread-like distal article; it scarcely reaches caudad of the 

 middle of the caruncle when laid along the latter. The paired tentacles are 

 much longer than the median and are of about the same thickness and general 

 form as the caruncle and lack a terminal filament; they reach three fourths the 

 distance to the caudal end of the caruncle when laid back along the latter. 



On the ventral surface of the head the palpi together form a heart-shaped 

 cushion with the tip forwards. This cushion is longitudinally divided by a 

 deep furrow. Its surface is wholly smooth. It is bordered by the first and 

 second somites and is touched caudally by the third. 



The median fold of the lower lip is cordate in outline with the apex directed 

 caudad. It is much smaller than the lobe formed by the palpi. The apex 

 extends to the middle of the fifth somite. The lobe is crossed by distinct radiat- 

 ing furrows. It is bordered by part of the third and the fourth somites, while 

 its apex extends into the fifth. 



The branchiae are short, the long setae projecting much beyond their distal 

 ends though not so the shorter ones. On each side of each somite there are for 

 the most part twelve branchiae. The branchiae in each row are closest together 

 at the ectal end of the series and the space between the first and second from the 

 mesal end of the series is distinctly larger than that between any other two. 

 Each branchia presents a short stout trunk which divides typically into two 

 branches which bear the many terminal twigs, each of which ends in a con- 



