NEREIDS. 101 



jaws, the orifice naked; gills in the form of a 

 globose tubercle over each foot ; foot simple, 

 warted ; tail without styles. 



P. peripatus. Fig. 164, n. s. ; and four of the middle 



segments mag. 



Neplitys (Cuv.). No tentacular cirri; antennae 

 rudimentary ; head very distinct, truncate in front ; 

 feet of two branches separated by a gill-leaf; pro- 

 boscis furnished with many rows of tentacles. 



N. margaritacea. Fig. 165 ; n. s. 

 Hombergii. 



Ioida (Johnst.). No tentacular cirri ; antennae 

 three, thread-like; eyes two, large; body linear, 

 lengthened ; segments numerous ; feet simple, each 

 with a dorsal cirrus, and two pencils of bristles. 



I. macropkthalma. Fig. 166, n. s. ; and head, a middle 

 segment, and tail mag. 



Psamathe (Johnst.). Four pairs of tentacular 

 cirri; antennae four, unequal, two -jointed ; eyes 

 four; proboscis thick, cylindrical, toothless, with 

 warts at its extremity ; feet simple, cleft ; upper 

 cirrus long, thread-like; lower one short; tail 

 with two styles. 



P. fusca. Fig. 167, n. s. ; and head and two mid. segments 



mag. 



Phyllodoce (Cuv.). Tentacular cirri on the first 

 segment; four or five minute antennae; no jaws; 

 superior cirrus of foot flat and leaf-like ; inferior 

 cirrus also leaf-like, but smaller. 



P. lamelligera. P. viridis. Fig. 168 ; n. s. and four 

 maculata. marginata. mid. seg. mag. 



bilineata. Paretti. 



