168 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



stems; the pinnate portion is broad-ovate, longer than the stems, ^th 

 about four to six long, slender pinnie on each side. The setre are very 

 numerous and comjilitjated. Those of the dorsal fascicle are long, slen- 

 der, capillary, mostly curved inward over the back. In the lower fas- 

 cicles there are several kinds: the upper (a) are two to four simple 

 ones, with long, tapering, strongly spinulated, very acute tips; the next 

 {b) are several compound sette, with the shaft stouter and strongly ser- 

 rulated near the end, while the terminal piece, of variable length, is 

 composed of many joints, and is minutely bifid at the tip ; the next (e) 

 are about six to eight stout, compound setie, arising both above and 

 below the supporting acicula?,, and having their shafts minutely and 

 closely circularly serrulate toward the end, and with a short, stout, 

 tapering, undi\ided, terminal piece, which has a hooked, claw-like tip, 

 with a sharp secondary process opposed to it; below these are {d) 

 numerous long, slender, compound setae, with shafts scarcely or not at 

 all serrulate, and with the subdivided terminal piece minutely bifid at the 

 tip, varying in length and number of joints, the middle ones being com- 

 paratively stout, Avith the terminal piece tapering and not very slender, 

 while the lower ones are very slender and capillary, with a very long, 

 tapering, terminal piece, of many joints. Color nearly white or pale 

 flesh-color. Length of largest, SO-^" to 100--. 



Vineyard Sound and off Nantucket Island, Mass., 10 to 20 fathoms, 

 clean silieious sand, 1875. Shores of Cape Cod Bay, in sand, at low- 

 water, at Barnstable (A. E. V.), and Provincetown (H. E. Webster). 



This elegant species is allied to S. BusJdi M'Intosh, and has similar 

 appendages to the scales. In our species, however, the pinnate pro- 

 cesses are less crowded and have longer stems and fewer and longer 

 pinnte. 



Laetmatonice armata, sp. nov. 



Lu'tmatonice Jiliconiis Verrill, formerly, in Ainer. Jonr. Science (non Kiuberg). 

 Body stout, depressed, broadest in the middle, tapered shghtly toward 

 both ends, the posterior most obtuse. Back covered with large, thin, 

 white, smooth scales, usually more or less concealed by a felt-like coat- 

 ing, to which mud and dirt adhere. Lower surface granulous. Head 

 small, but prominent, with two mhiute, rounded, tubercle-Uke antennoe in 

 front and a median antenna arising between them, which has a stout, 

 tapering base, but becomes very slender for most of its length; it is 

 much shorter than in L. fiUcornis, its tip not reaching to the basal third 

 of the palpi. The latter are large and long, regularly tapered to the 

 end, three to four times as long as the median antenna and four or five 

 times as thick. The first parapodia bear two slender cirri on the upper 

 ramus, which are about as large as the median antenna. The scales are 

 large, smooth, and translucent, without appendages, mostly broadly 

 rounded on the inner and posterior edges, and deeply emarginate on 

 the outer attached border. The upper rami of the parapodia bear, besides 



