1905.] NATURAL SCIENCES OF PHILADELPHIA. 537 



the dorsal almost equals, while the ventral is ^ shorter. In one speci- 

 men the protruded proboscis is short and broad, 7 mm. long and 3.5 

 wide. The jaws are deep brown, strong and with a prominent lateral 

 ridge on the jaw plate. There are 9 soft papillifi above and 9 below. 



Fifteen pairs of elytra are borne on the usual somites by stout elytro- 

 phores which are nearly equalled in size by the homologous dorsal 

 tubercles of the cirriferous somites. The elytra (fig. 20) are thick, stiff 

 and of tough, cartilaginoid texture; the margins bear only a few goblet- 

 shaped sensory papillae and traces of a few or no cilia ; the dorsal surface 

 is studded with small, distant, horny spines and much more numerous, 

 smaller, horny prickles; the former are always in the center of round, 

 slightly elevated brown spots and the latter, while themselves brown, 

 are surrounded by a pale ring. The first elytron is circular, the next 11 

 subquadrate reniform, and the last 2 or 3 broadly ovate, the last with a 

 straight inner margin. 



Typical parapodia (fig. 19) are rather long, high and compressed. 

 The neuropodium is prominent and slopes both dorsally and ventrally 

 to the prominent acicular process which is produced into a short soft 

 supraacicular papilla. The notopodium is also large and produced into 

 a prominent acicular process. The ventral cirrus is subulate, with a 

 slender end reaching to about the third row of subacicular setae. The 

 dorsal cirrus is remarkable for the great length of the ceratophore which 

 is f as long as the style and in close contact with the dorsal border of 

 the notopodium. The style is short and stout, little tapered and has a 

 subterminal enlargement tapering into a slender tip. 



The body is very flat and much depressed, widest near the middle 

 and tapering both ways. Nephridial tubercles exist on all but a few 

 of the most anterior somites; they are of moderate length and are 

 directed dorsally between the bases of the parapodia. The anal cirri 

 are similar to the dorsal cirri and equal to the last 9 segments in length. 



Neuropodial setae are borne in 3 supraacicular and 8 subacicular 

 series, those in the dorsal rows being, as usual, more slender and 

 provided with a greater number of spines. They (fig. 17) are 

 moderately slender with rather elongated ends provided with 

 numerous rows of spines which become larger and more prominent 

 distally ; the smooth tip is rather long, slender and but little 

 hooked. The parapodium of I, bearing the tentacular cirri, has 

 a small neuropodium with an acicular process and 2 or 3 setae. The 

 notopodial sette (fig. 18) are relatively few in number, much stouter 

 than the neuropodials, the dorsal ones especially being short and stout 

 and the longest ventral ones about h the length of the longest neuro- 



