228 BUSH 



PROTULA ATYPHA sp. nov. 



Pl. XXXVII, figS. I, 2, 4. 



Type locality. Pacific Grove, California. 



An imperfect animal without color, poorly preserved in a portion of 

 a white, calcareous, irregularly bent tube. 



There are but 12 segments back of the thorax, which is long, of 7 

 segments, all of the well-separated fascicles of setae directed obliquely 

 backward in nearly straight series, the wide membrane bordering it 

 forming a rather deep irregular (mutilated) collar. 



Branchial lobes of good size, elongated ventrally and involute, bear- 

 ing numerous (about 30, besides a few rudimentary ventral ones) long, 

 delicate ( ? ), densely pinnate branchiae in each lobe. 



No operculum. 



Mouth parts not determinable. 



Setae on the thorax of one form, slender, unequal (the shorter ones 

 the broader) , capillary, those on the collar fascicles not different from 

 the others. Setae on the abdomen in small fascicles and bent at the 

 base of the moderately broad tapered blade (pi. xxxvn, fig. i). 



Both thoracic and abdominal tori small, with the thin uncial plates 

 (pi. xxxvn, figs. 2, 4) of similar size and form, apparently smooth, 

 with only a long pointed terminal tooth, serrations but faintly visible on 

 the exposed surface even under a high objective. 



Length of thorax 9 mm. ; breadth about 3 mm. ; length of longest 

 branchia about 9 mm. 



Pacific Grove, California, August, 1901, one specimen. 



The thoracic membrane does not form a scalloped border along the 

 sides, so conspicuous in P. media Stimpson from Grand Menan, New 

 Brunswick, figured by Smith and Harger 1874 (see pi. XLIV, fig. 7), 

 and the setae are much coarser, those of the latter being very slender ; 

 the (much narrower) uncial plates also have more distinct teeth. 



On account of its long abdominal setae, Saint- Joseph would doubt- 

 less refer this species to his new subgenus Protulopsis, in which the 

 abdominal setae are u oblique bayonets, plicate on the border," as in 

 P. intestinum Lam. Protula as a subgenus is restricted for species 

 having shorter 'sickle-shaped' abdominal setae, as P. tubular ia Mon- 

 tagu. The figures given by Benedict (1886) of the abdominal setae 

 of P. diomedece and P. alba show little resemblance to the figure 

 given by Saint-Joseph of that of P. tubularia, but all three and others 

 are mentioned by him as belonging together. 



