1909.] NATURAL SCIENCES OF PHILADELPHIA. 267 



vicinity of Monterey Bay and was taken at Third Beach Point (which 

 is the type locality) on July 6, and at "big tide pool" on June 20. 

 A single example also occurs in the Starks collection from San Diego, 

 also taken between tides. 



OIRRATULID^i. 



Cirratulus spirabranchus Moore. 



Cirratulus spirabranchxis Moore, Proc. Acad. Nat. Sci. Phila., 1904, pp. 

 492, 493; PI. XXXVIII, figs. 26 and 27. 



Cirratulus luxuriosus Moore. 



Cirratulus luxuriosus Moore, Id., pp. 493, 494; PI. XXXVIII, figs. 28-31. 



Both of these species are quite plentiful between tides on the beach 

 at San Diego. 



Tharyx multifilis sp. now (Plate IX, tig. 43). 



The type (a male) is 58 mm. long and has a maximum diameter at 

 the end of the anterior third of 2.1 mm. The segments number 240. 

 A female is slightly smaller and more slender. 



Prostomium (fig. 43) a short slightly depressed cone with a rather deep 

 ventral longitudinal groove and just anterior to it a transverse one. 

 No eyes visible, though there is a slight discoloration near the posterior 

 border. A pair of swellings behind and above mouth are the nuchal 

 organs, but there is no trace of appendages. 



Peristomium — probably representing three coalesced segments — 

 a large, swollen, apodous region about twice as wide and long as the 

 prostomium and marked with one or two partial furrows. Mouth 

 large, with smooth lips. 



Remaining segments setigerous, the anterior region about six 

 millimeters long, consisting of about sixty excessively short segments, 

 twelve to twenty times as wide as long, depressed and somewhat 

 widened. Behind this the 'body is nearly terete, slightly flattened 

 below and composed of longer, feebly separated segments about six 

 to eight times as long as wide. Segments all perfectly simple and 

 uniannular. The body increases in diameter through the anterior 

 third and then tapers gradually to the caudal end, terminated by a 

 minute pygidium with its central anus surrounded by a welt-like rim. 

 A narrow neural groove extends for the entire length and forks at the 

 peristomium to embrace the mouth. 



Parapodia consisting of minute setigerous notopodial and neuropodial 

 tubercles, the latter situated close to the ventral surface at the foot of 

 the strongly arched dorsum. Immediately above the first arises the 

 pair of large clavate tentacular cirri, which have a diameter nearly 



