244 PROCEEDINGS OF THE ACADExMY OF [April, 



Stations 4,306, off Point Loma Lighthouse, vicinity of San Diego, 

 207-497 fathoms, green mud, fine sand and gravel; 4,310, same 

 locality, 71-75 fathoms, green mud and fine sand; 4,349, same locality, 

 81-134 fathoms, green mud and fine sand; 4,364, same locality, 

 101-129 fathoms, gray sand, mud and rock; 4,431, off Santa Rosa 

 Island, 38-45 fathoms, varied bottom; 4,436 off San Miguel Island, 

 264-271 fathoms, green mud; 4,443, off Point Pinos Lighthouse, 

 Monterey Bay, 32-37 fathoms, fine gray sand; 4,462, same locality, 

 161-265 fathoms, green mud; 4,464, same locality, 36-51 fathoms, 

 soft dark gray mud; 4,475, same locality, 58-85 fathoms, soft green 

 mud; 4,480, off Santa Cruz Lighthouse, 53-76 fathoms, dark green 

 mud, sand; 4,482, same locality, 43-44 fathoms, soft green mud; 

 4,485, same locality, 39-108 fathoms, soft green mud, sand; 4,510, 

 off Point Pinos Lighthouse, 91-156 fathoms, gray mud; 4,522, same 

 locality, 130-149 fathoms, gray sand and shells; 4,523, same locality, 

 75-108 fathoms, soft dark mud; 4,526, same locality, 204-239 fathoms, 

 soft gray mud ; 4,538, same locality, 795-871 fathoms, hard gray sand ; 



4.548, same locality, 46-54 fathoms, coarse sand, shells and rock; 



4.549, same locality and bottom, 56-57 fathoms. 



NEREIDS. 



The Nereidse are represented less richly than in similar collections 

 along the more northern shores of the Pacific side of North America. 

 The absence of any of the large species of Alitta is especially note- 

 worthy. 



Nereis procera Ehlers. PI. XV, fig. 18. 



Nereis procera Ehlers, Die Borstenwiirmer, 1S68, pp. .'i57-559; Taf. XXIII, 

 fig. 2. 



Represented by a number of small specimens, 21 to 45 mm. long, 

 in the atokous phase and all sexually immature, which agree closely 

 with Ehlers' description and also with larger mature examples already 

 reported in these Proceedings for 1909 from the littoral zone at San 

 Diego and Monterey Bay. The jaws and paragnaths conform gen- 

 erally to Ehlers' description, but group V may be absent or represented 

 by either one or two paragnaths and the band VII- VIII varies much 

 in width. The number of segments varies from 60 to 75. 



The setse, studied on one specimen, are disposed as follows: On 

 anterior parapodia the notopodium bears six or eight homogomphs 

 with slender "fish-bone" appendages, the neuropodial supra-acicular 

 fascicle contains four or five similar homogomphs and usually two 

 stout heterogomphs with short, scarcely falcate appendages, and the 



