NO. 2 HARTMAN : POLYCHAETOUS ANNELIDS 245 



is 37, length 10 to 20 mm. The last elytra usually extend over the pygidial 

 region so as to almost or entirely cover it. The dorsum is M^ell covered by 

 the deeply imbricated elytra, which also extend laterally and cover about 

 the proximal tvi^o thirds of the parapodial length but leave exposed the 

 spinous tips of notosetae and the free portions of neurosetae (pi. 20, fig. 

 10). 



The prostomium is slightly longer than broad, with well-marked 

 median sulcus, dividing it into 2 halves ; anterior margins are prolonged 

 anteriorly as frontal, diverging processes between which median and 

 lateral antennae emerge. Eyes are reduced, the first pair anterior to the 

 middle of the prostomium and dorsolateral in position ; the posterior ones 

 are nearer together and located near the posterior margin of the pro- 

 stomium. Median and lateral antennae are clavate, with slight subdistal 

 thickening; the lateral ones are only about half as long as the median, but 

 all are similar in shape, and terminate in slender filaments. The median 

 antenna has a heavy basal cirrophore, extending conspicuously between 

 the prostomial lobes (pi. 20, fig. 11). 



Peristomial cirri are similar in length and form to the median antenna. 

 A stout, curved seta is inserted near the middle of the cirrophore (pi. 20, 

 fig. 11). Parapodia are heavy, well developed, project laterally; they are 

 about two thirds as long as the width of the body in the median region. 

 The notopodium is short, its setae disposed in a spreading whorl, the 

 dorsalmost about half as long as the ventralmost ; the longest ones extend 

 distally to the bases of the neurosetae. The neuropodium is longer, with 

 presetal lobe distally oblique along its free end ; it terminates in a slender 

 acicular lobe along its dorsal side ; the aciculum does not always project 

 from it. The postsetal lobe is shorter and evenly rounded. The ventral 

 cirrus is inserted proximally to the middle of the parapodial base; it has 

 a papillar lobe at its base. Dorsal cirri are long, extend distally beyond 

 neuropodia, and are inserted on elongate cirrophores (pi. 20, fig. 19). 



Notosetae are in fascicles of 20 to 30 ; they all resemble one another 

 but are of varying lengths, the longest on the ventral side; their tips are 

 bluntly conical, the spinous region narrow (pi. 20, figs. 21, 22) ; they are 

 thicker than the neurosetae. The latter are in vertical series of 20 to 30 

 in a fascicle, directed laterally; each terminates distally in a falcate hook 

 with a long, slender, accessory tooth ; the spinous region consists of 6 to 

 10 rows of pectinae (pi. 20, fig. 20). 



Elytra number 15 pairs, are easily detached ; they increase in size from 

 the second to the thirteenth pair (pi. 20, figs. 13-17) and decrease again 

 to the last pair (pi. 20, fig. 18). All have entire margins and almost 



