244 PROCEEDINGS OF THE ACADEMY OF [April, 



rows of conical papillae of usually five each, the unpaired dorsal and 

 ventral papillae being no larger than the others. 



No characters distinguishing these specimens from examples of the 

 species from the Atlantic Ocean are obvious. 



NEREIDS. 



Nereis procera Ehlers. 



Nereis procera Ehlers, Die Borstenwiirmer, 1868, pp. 557-559; Taf. XXIII, 

 fig- 2. 



Ten specimens were taken in the vicinity of Monterey Bay, two 



bearing each of the following labels: Point about Third Beach; Big 



tide pool, Lighthouse Point, June 20, 1905, and June 28. 1904; dredged 



July 9, 1904, and dredged Delmonte wharf, July 12, 1904. Of the three 



from San Diego one is 3 mm. in diameter and filled with large eggs. 



The parapodia and other parts exhibit no epitokous modification. 



Nereis (Alitta) vexillosa Grube. 



Nereis vexillosa Grube, in Middendorff, Reise in Siberiens, etc., II, 1851, 

 p. 4; Taf. II, figs. 1, 5, 6. 



Taken at San Diego only; 14 small atokes and one small female 

 epitoke. The largest of the atokes is 50 mm. long, and all of them have 

 the not'ocirral laminae much less developed than on larger specimens. 

 One exserted proboscis has paragnaths arranged as follows: I, three 

 in a longitudinal series; II, tapering arcuate groups of three rows of 

 small cones ; III, transverse band in three rows ; IV, wider curved band, 

 broader behind; V, absent; VI, four large cones in lozenge-shaped 

 figure; VII and VIII, broad transverse band encircling ventral and 

 lateral portion of basal ring, a tract of very small paragnaths in front 

 of ventral part. 



The epitoke is filled with large eggs. The parapodia agree with 

 Johnson's figure, but the setae are arranged somewhat differently. 

 Those of the dorsal rami are all of the "fish-bone" type, the stout 

 compound setae belonging to the dorsal supra-acicular fascicle of the 

 neuropodium. The paragnaths exhibit several peculiarities; their 

 number is generally reduced, those of VI are coalesced into a single 

 large one on each side ; V is present as a single cone. 



Nereis (Alitta) virens plenidentata subsp. nov. 



Under this name I am recording provisionally a species of Alitta 

 that appears to be quite common on the sand-bars in San Diego Bay. 

 The northern Pacific species, which is found from Ochotsk Sea and 

 Alaska south nearly to San Francisco, seems to differ from Atlantic 

 examples of A. virens in several respects, and particularly in having 



