6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



The notopodium is smaller than the neuropodium and is more uniform 

 in diameter throughout. Its apex is conical, but dorsal tO' this is a 

 small lobe, and numerous cirri arise from the ends of both parts. In 

 all somites a heavy gill is attached to the body wall above the para- 

 podium. In somites having elytra this is just ventral to the cirrophore 

 (fig. 13) . In other somites the dorsal cirrus is a fleshy lobe resembling 

 a cirrophore but lacking a style (fig. 12). 



The anterior elytra are very small, but later ones increase in size 

 so that they overlap on the dorsal surface. Behind the twentieth 

 they are lost in the specimens at hand, but apparently the large size 

 is continued to the posterior end of the body. They are located on 

 somites 2, 4, 5, 7, and on alternate somites behind this. All are 

 roughly oval in outline and have smooth margins and a very deli- 

 cate translucent appearance. A prominent feature is a brown spot 

 near the elytrophore. 



The setae of the first parapodium are all very slender and long, 

 some having smooth margins, others finely serrate. In the second 

 parapodium the notopodial setae are like those of the first, but neuro- 

 podial ones are shorter and heavier and curve to fine points, the 

 terminal part being camerated (fig. 14). In later parapodia there 

 are several kinds of setae, some like those in the second, others long, 

 slender, and sharp-pointed, distinctly bent and carrying two rows of 

 toothed plates (fig. 15). In the neuropodium there is a ventral bundle 

 of compound setae, whose terminal joints are straight, pointed, and 

 camerated (fig. 16). 



Type. — U.S.N.M. no. 20033, collected at station 14 at latitude 

 i8°3i'N., longitude 66°4' 10" W.— latitude i8°3o'3o" N., longitude 

 66°3'i5" W., north of Puerto Rico, at 200-240 fathoms. Others were 

 collected at station 23, latitude i8°32'i5" N., longitude 66° 1/45" W.— 

 latitude i8°32' N., longitude 66°2i'i5" W., north of Puerto Rico, 

 in 260 fathoms. 



HYALINOECIA Malmgren 



HYALINOECIA BRANCHIATA, n. sp. 



Plate 2, figs. 17-19 



This name is provisionally given to^ a single incomplete specimen 

 15 mm long and 2 mm wide, and retaining only 20 somites. Because 

 of the lack of nuchal cirri, it belongs in the genus Hyalinoecia. 

 The specific name refers to the unusual amount of gill development. 



The prostomium (fig. 17) has a width of about twice its length 

 and carries short tentacles that are obscurely, if at all, ringed on 

 the cirrophores and have slender styles. The style of the median 



