270 PROCEEDINGS OF THE ACADEMY OF [April, 



tened distally. In the posterior fourth the spines of both fascicles 

 become less stout, straighter and associated with capillary setse which 

 gradually increase in length and finally displace the spines altogether. 



In the preserved state these worms are perfectly opaque and of a 

 deep sooty black or sometimes a bluish black, especially deep and 

 uniform in the San Diego examples, but some of them become more 

 or less brown in the middle or anterior regions. Ventral face of 

 prostomium, groove of prehensile neurocirri and bases of branchial 

 notocirri pale. 



About fifteen examples were taken at Third Beach Point, vicinity 

 of Monterey Bay, on July 6, 1905, and about thirty at San Diego. 

 Most of these are mature and contain nearly ripe ova or sperm balls. 



TEREBELLID^. 

 Terebella oalifomioa Moore. 



Terebella (Schmardanella) californica Moore, Proe. Acad. Nat. Sci. Phila.,, 

 1904, pp. 496-498; PI. XXXVIII, figs. 36, 37. 



This species is quite plentiful at San Diego, living in burrows in the 

 beach at low water. Including the lot upon which the original descrip- 

 tion was based, about thirty specimens occur in the collection. Several 

 are packed full of eggs and some of them are much longer than the 

 type, reaching 130 mm. The number of setigerous segments varies 

 from 25 to 28. 



Amphitrite robusta Johnson. 



Amphitrite robusta Johnson, Proc. Bos. Soc. Nat. Hist., XXIX (1901), pp. 

 425, 426; PI. 16, figs. 164-168. 



A single example taken at San Diego is a female stuffed with eggs. 

 It is about 105 mm. long, the first eleven thoracic segments being 

 11 mm. long and equal to the greatest width of the thorax. 



Lanice heterobranchia Johnson. 



Lanice heterobranchia Johnson, Proc. Bos. Soc. Nat. Hist. XXIX (1901), 

 pp. 427; PI. 17, figs. 172-174. 



San Diego. A single small macerated Lanice probably represents 



this species, with the description of which it is in accord, except that 



the terminal twigs of the branchiae are fewer. 



Pista elongata sp. nov. (Plate IX, figs. 45-47). 



Form rather slender and elongated, clavate, the somewhat thickened 

 thorax followed by a constriction in the anterior abdominal region; 

 posteriorly gently tapered to the pygidium. Length 160-192 mm., 

 of which the thorax is 25-28 mm. ; diameter of thorax 5 mm. Number 

 of segments 176-240, 20 belonging to the thorax. 



Prostomium a prominent, stiff, broad and simply arched upper lip,. 



