NO. 1 hartman: goniadidae, glyceridae, nephtyidae 83 



Hemipodus armatus, new species 

 Plate 12, figs. 1-5 



Collection.— 265-34 ( 1 ) . 



The single individual is posteriorly incomplete; it measures 37 mm 

 for 71 segments and is 1.3 mm wide at its greatest width. Segments 

 are biannulate, with the parapodial ring slightly the longer one. The 

 prostomium is much longer than wide and lacks visible annulation; 

 its length is about 5 times its width. There are no visible eyespots. The 

 4 terminal antennae are filamentous and taper distally; the 2 ventral 

 ones are longer than the 2 dorsal ones. 



The proboscis is completely everted and torn away from the oral 

 aperture so as to be nearly detached; it is 7 mm long and widest at its 

 paragnathal end. Its most striking feature concerns the proboscidial 

 organs that closely cover it all around ; they resemble transversely ridged 

 villi because of their tall, slender form. All are apparently of one kind, 

 except those near the base of the proboscis which are smaller than the 

 others. Seen singly (fig. 2) they are slightly beaked at the terminal end, 

 the beak directed away from the distal jaws; each has 30 to 34 transverse 

 ridges on the concave side; the aperture is subterminal and with 

 favorable illumination, can be seen to contain a large cell near the base, 

 with an internal canal and axial cells more distal. These organs are 

 much like those shown for some species of Glycera (compare plate 10) 

 and thus differ from those of other species of Hemipodus. 



Paragnaths are hard and very dark to black; the embedded aileron 

 is a nearly straight rod (figs. 4, 5) ; it is attached to the jaw near the 

 middle. The first parapodia are minute but similar to the second one and 

 those farther back. They gradually increase in size so as to be fully 

 developed by the tenth segment. All are uniramous (fig. 3), have single 

 yellow acicula and composite spinigerous setae. The dorsal cirrus is 

 globular and located some distance above the fleshy parapodium. The 

 ventral cirrus is larger, slightly compressed and emerges directly below 

 the parapodial base. A digitate process at the distal end of the presetal 

 lobe and abruptly emergent from its posterior margin, is specifically 

 characteristic (fig. 3). 



Setae are arranged in fanshaped fascicles and, where best developed, 

 number 10 to 12 in a row. They have an articulation that is nearly 

 homogomph. In the specimen, taken March 3, 1934, the body cavity, 

 including the coelom in the everted proboscis is crowded with ova. 



H. armatus is separable from other species of the genus in its unique 

 proboscidial organs that are marked with 30 to 34 transverse ridges, 



