COMPLETE HARTMAN: POLYCHAETES FROM CALIFORNIA 73 



Another species in the same habitat (in kelp holdfasts) has both 

 dorsum and ventrum marked with dark spots, usually three to a segment 

 dorsally and the same number ventrally; the median series of spots is 

 the largest. 



Still another species, also in this habitat, has the dorsum marked 

 with 4 black, longitudinal lines, extending through most of the body 

 length but fading posteriorly. Stolon formation is indicated at segment 14. 



Hesperalia nans Chamberlin (1919, p. 9) from southern California, 

 may be referable to one of these species, unless the so-called neurocirri 

 refer to ventral cirri. The dorsum was described as light fulvous, with 

 series of blackish, transverse lines across the dorsum such that there 

 are 4 segments between each 2 dark lines. 



Genus Exogone Oersted, 1845 / 



Type E. naidina Oersted, 1845 / \m 



Exogone uniformis, new species f 



Plate 6, fig. 1 ; Plate 7, figs. 1-4 



- 



Exogone lourei Hartman, 1960a, p. 90. 



Collections. This species is frequent in samples from the shallow shelf 

 of southern California; the type specimen was selected from Station 5102. 



Total length is 3.7 mm; number of segments 41. The body is linear, 

 with smooth surface, pale or white and without color markings. Some 

 individuals have the pharynx partly everted showing a sharply pointed, 

 very slender tooth directed forward. The muscular gizzard is visible 

 through the body wall and extends through six and a half segments 

 (PI. 7, fig. 1). Some mature individuals have juveniles attached to the 

 ventral side of the body (PI. 6, fig. 1), through setigerous segments 

 15-25 or 16-31; the first 14-15 and the last 10 segments lack gonadial 

 products. Some smaller individuals, believed the same species, have long 

 natatory setae present from segments 20 through 34 ; these segments are 

 followed by five with normal setae. 



The prostomium is quadrate, wider than long, has 3 antennae, all 

 equally short or the median one considerably longer than the others and 

 distally expanded ; there is no uniformity regarding the length and 

 thickness of these antennae. Eyes number two pairs, in trapezoidal 

 arrangement, on the prostomial lobe behind the antennal insertion. The 

 palpi are large, broad, fused medially and have a slight median notch 

 at the distal forward end ( PI. 7, fig. 1 ) . Peristomial cirri are short and 

 fusiform. The posterior end of the body terminates in a pair of long, 

 slender anal cirri attached laterally, and divergent distally. 



