268 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



that between Perch Rock Point and the mouth of Andrews Creek indi- 

 viduals were entirely P. williamsi, whereas to the south of this point they 

 were largely this species but included also some P. dillonensis (below), 

 and that the proportion of the latter increased as one went southward 

 along the beach. He found, further, that P. williamsi is on the whole a 

 smaller species, measuring only 34 to 48 mm long. Some are sexually 

 mature in June. Color in life is usually reddish purple. 



Pectinophelia dillonensis Hartman 



Hartman, 1938, pp. 108-109, figs. 59-61. 



This was collected in quantity from the sandy beach at Dillon 

 Beach, at moderately high to medium water lines, by T. L. Rodgers and 

 others, during the summer of 1941. It was associated with P. williamsi 

 (above) in some beds, but most abundant just south of the mouth of 

 Andrews Creek. Total length is 50 to 68 mm; the collection includes 

 some that are sexually mature. Color in life is usually deeper bronze 

 purple than that of P. williamsi (above). 



Family Pectinariidae 



Key to Species 



Uncini with major teeth in single series of 4 only; tubes curved, 

 constructed of moderately coarse, black and white sand grains; 

 cephalic spines blunt, short .... Cistenides brevicoma 



Uncini with major teeth in 2 series, number 4 or 5 in each longi- 

 tudinal row; tubes nearly straight, constructed of fine, reddish 



sand; cephalic spines long, tapering 



Pectinaria calif orniensis 



Cistenides brevicoma (Johnson) 



Hartman, 1941, pp. 331-332, pi. 50, figs. 13, 14, 16, pi. 52, fig. 23. 



This was collected occasionally in sandy mud flats of Tomales Bay 

 and Bodega Lagoon. Tubes are somewhat curved, constructed of coarse, 

 dark gray sand grains, and flare toward their anterior end. They measure 

 40 to 52 mm long. 



Pectinaria californiensis Hartman 

 PIate21, Figs. 25-27 



Hartman, 1941, pp. 333-335, pi. 49, figs. 1-6, pi. 52, fig. 21. 



This was common in muddy sand flats of Bodega Lagoon, at low 

 water line; others come from Tomales Bay. Tubes are nearly vertical 



