424 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



Leptophidium profundorum, Gill. 



ISpecimens of Leptophidium profundornm, Gill, were obtained from the 

 following stations : 



NOTICE OF RECENT ADDITIONS TO THE MARINE INVERTEBRATA 

 OF THE NORTHEASTERN COAST OF AMERICA V/ITH DESCRIP- 

 TIONS OP NEW GENERA AND SPECIES AND CRITICAL REMARKS 

 ON OTHERS. 



PART V—ANNELIDA, EOHINODERMATA, HYDROIDA, TDNICATA. 

 By A. E. TERRII^Ii. 



ANNELIDA. 

 Polynoe Acauellas Verrill. 



Verrill, Trans. Conn. Acad., vol. iv, !>. 3246, pi. 6, figs. 5, 5a, 1881; pi. 14, figs, 



9, ya, 96. 

 Verrill, Report U. S. Fisli Com. for 1883, [p. 23], pi. 39, figs. 172, 172a, 172&, 

 172c, 1885. 



Body elongated, strongly depressed, moderately wide, widest at about 

 the anterior third, tapering to the posterior end, composed of about 

 sixty-five setigerous segments. Scales thin, nearly smooth to the naked 

 eye, moderately large, but usually leaving the middle of the back un- 

 covered, broad-ovate or roundish in form, with a smooth, even margin. 

 The surfi^ce under a microscope shows numerous minute, blunt, sub- 

 conical papillae, of nearly uniform size. Head broader than long, with 

 the sides well-rounded, narrow posteriorly, strongly bilobed in front, the 

 lobes terminating anteriorly in small, conical papillae. Eyes large, dark 

 blue, the anterior ones about opposite the posterior base of the middle 

 antenna ; the posterior pair a 1 ittle behind the middle, looking a little 

 backward. Median antenna rather long, the length equal to about three 

 times the length of the head, slender, with a rather stout basal article. 

 Palpi stout, gradually tapered to the acute tip, smooth, of about the 

 same length as the median antenna. The two upper tentacular cirri are 

 of nearly the same length as the palpi, but much more slender ; the 

 inner ones are much smaller, scarcely' more than one-third the length of 

 the palpi. The ventral cirri of the first segment are long and slender, 

 about as wide as the median antenna, and about three-fourths as long. 

 The proboscis is large, usually exsert in preserved specimens, dark 

 brownish purple in color, with eighteen marginal, pale purple papilla^,, 

 centered with a dark purple line. Dorsal cirri long, slender, smooth, 

 delicately tapered, extending beyond the ends of the setae. Ventral 



