620 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



GLYCERA POSTEROBRANCHIA, new species. 



Plate 51, tigs. 3-8. 



Type. — Cat. No. 18960, U.S.N.M. An incomplete specimen, 75 

 mm. in length, not including extruded proboscis. Width, 3 mm. an- 

 teriorly, gradually increasing to 5 mm. posteriorly. Length of 

 pharynx, 8 mm. Number of somites, 90; terminal portion lost. 

 Color of specimen, light brown. Dorsal surface marked by brown 

 longitudinal line. Mid-ventral line, characterized by longitudinal 

 flattened area, 0.5 mm. in width. Somites two-ringed, the rings being 

 of equal circumference throughout. 



Head (fig. 3) 2.5 mm. in length, or equal in length to first eight 

 somites. Number of rings in head not distinguishable. Four small 

 papillae at end. Extruded proboscis large, equaling the first 37 

 somites in length. Cuticle covered with two kinds of papillae. Mi- 

 nute sucker-like type covering whole surface. Large, blunt, conical 

 type on proximal end. Jaws (fig. 4) with lateral appendage for 

 muscle attachment. 



Parapodia gradually increasing in size and length posteriorly. 

 Anterior parapodia (fig. 5") with long, conical dorsal and ventral 

 lobes. Dorsal cirrus a rounded tubercle. Ventral cirrus similar in 

 shape to dorsal lobe of ventral division. Posterior parapodia (fig. 

 0) elongate, divided into one dorsal and two ventral rami, the ventral 

 lobe of the ventral ramus equaling the dorsal ramus in length. Ven- 

 tral cirrus similar in shape to dorsal lobe of ventral ramus. Dorsal 

 cirrus a small pointed tubercle. Gills beginning on twenty-fifth 

 somite as small knobs at dorsal base of parapodia lateral to dorsal 

 cirrus, gradually increasing (fig. 6) until they appear as long rugose, 

 finger-like processes. 



Setae of two kinds. Dorsal (fig. 7), simple capillary with finely 

 serrate edge. Ventral (fig. 8), compound with finely serrated blade. 



Collected at station D5375, Tayabas Light, Marinduque Island, 107 

 fathoms, green mud bottom. 



Family SPIONIDAE. 



Genus AONIDES Claparede. 



AONIDES DIVERAPODA, new species. 



Plate .11. figs. 0-12. 



Two specimens, one with tentacular cirri missing. Both well pre- 

 served anteriorly. Greatest width, 3 mm. The perfect one is the type, 

 Cat. No. 18961, U.S.N.M. 



Prostomium (fig. 9) blunt anteriorly, extending forward over 

 mouth ; prolonged posteriorly as" long, sinuous nuchal ridge as far as 



