154 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 85 



side inserted close together and widely separated from those of the 

 other side. Nuchal papillae conspicuous, at postectal margin of 

 prostomium. 



Proboscis subdistally beset with 22 rows of papillae, 4 or 5 in a 

 row; without median papilla; proximally covered with low, elon- 

 gated, wartlike elevations, which are more like wrinkles than papillae. 



Recurved cirrus fii-st present as minute swelling on ventral side 

 of dorsal cirrus of sixth setiger, becoming elongate triangular by 

 tenth setiger; proximal two-thirds of cirrus thickened at twenty- 

 third setiger, continuing gradually thicker, appearing inflated, maxi- 

 mum development between setigers 35-48; slenderer posteriorly, also 

 shorter; absent from about 17 last setigers. 



Figure 66. — Nephtys rickettsi, new species : a, An anterior parapodium in anterior view, 

 with setae shown; b, thirty-fifth parapodium (slightly anterior to middle of body) in 

 anterior view ; c, a posterior parapodium in anterior view, with setae shown. 



Parapodia robust, with large, imbricated, fleshy lamellae and cirri 

 in median region. First parapodium directed anteriorly, enclosing 

 prostomium from side; its dorsal and ventral cirri somewhat elon- 

 gated, ventral cirrus roughly triangular; its notopodium with stout 

 aciculum and well-developed setal fascicle; its neuropodium with 

 reduced aciculum and fewer setae than are present in more posterior 

 parapodia. Dorsal and ventral cirri of first few (five or more) seg- 

 ments subglobular (fig. 66, a). Median parapodia with broad, thick 

 rami, acicular lobes unequally bilobed (fig. 66, b) ; postsetal lamellae 

 broad, thick, foliaceous. Posterior parapodia plain, the rami widely 

 diverging, lobes not noticeably developed, acicular lobes hardly dis- 

 cernible, the stout aciculum emerging from anterior face of para- 

 podial lamella (fig. 66, c). 



