300 PROCEEDINGS OF THE ACADEMY OF [April, 



differences exhibited by these specimens is that the parapodia are 

 longer with the postsetal lobes and neurocirrus much more elongated, 

 slender and acute, and the appendages of the compound setae longer 

 and more slender. In all important respects, prostomium, para- 

 podia, proboscis papillae and jaws, the resemblance is very close. 



All specimens are small, the largest varying from 40 to 46 mm. 

 long with 98 to 109 segments and most being much smaller. All are 

 largest in the proboscis region and tapered to a slender posterior region. 

 Prostomium with eight rings beyond the enlarged base, the three 

 terminal ones being very small. Body segments always distinctly 

 triannulate. 



The jaws are typical and the clavate proboscis thickly covered 

 with slender conical papillae and either eighteen or twenty longitu- 

 dinal rows of larger ovate papillae, both of which are exactly like 

 those of Atlantic specimens. 



Glycera nana Johnson is very closely related to G. capitata, the 

 principal differences being that the segments of the former are only 

 biannulate and that the lobes of the parapodia have slightly different 

 forms. In this connection it should be noted that at least some of 

 the specimens reported by me from San Diego under the name of 

 G. nana (Proc. A. N. 8., 1909, p. 259) are really small examples of 

 other species. One of these is a young G. robusta Ehlers and the other 

 a G. rugosa Johnson with completely retracted gills. 



Specimens of G. capitata occur from the following stations: 4,343 

 off South Coronado Island, vicinity of San Diego, 60-155 fathoms, 

 fine gray sand; 4,452, off Point Pinos Lighthouse, Monterey Bay,, 

 49-50 fathoms, green mud and fine sand ; 4,457, same locality, 40-46 

 fathoms, dark green mud; 4,464, same locality, 36-51 fathoms, soft 

 dark gray mud; 4,485, off Santa Cruz Lighthouse, Monterey Bay,. 

 39-108 fathoms, soft green mud and sand; 4,548, 4,549, 4,550 and 

 4,551, all off Point Pinos Lighthouse, Monterey Bay, 46-57 fathoms,, 

 coarse sand, shells and rock, except 4,559, where green mud and rock; 

 4,557, off Point Pinos Lighthouse, 53-54 fathoms, rock. 



Glyoera tesselata Grube. 



Glycera tesselata Grube, Arch. Naturgesch., XXIX, I, p. 41, Taf. IV, fig. 4. 



This second European species as nearly as frequent and, at southern 

 stations, as generally distributed in the region as G. capitata. The 

 only obvious respect in which these examples appear to differ from 

 European ones is in the possession of a smaller number of prostomial 

 rings, for, whereas Ehlers attributes thirteen and Mcintosh seventeen 

 rings to this region, these have only eleven or twelve nearly equal 

 rings above the enlarged base. 



