K. J. Bush — Two genera of tubicolous Annelids. 131 



Art. XIII. — Descriptions of the two genera of tubicolous 

 Annelids, Paravermilia and Pseudovermilia, with species 

 from Bermuda referable to them ; by K. J. Bush, Ph.D. 



[Brief Contributions to Zoology from Museum of Yale Univ., No. LXVIII.] 



These two genera, Paravermilia and Pseudovermilia, are 

 most readily recognized by the greater or less development of 

 the thoracic membrane and by the form of the terminal tooth 

 on the uncini. Both have bulbous opercula with horn-colored 

 chitinous caps ; both have simple, regularly tapered setse on 

 the thorax, becoming more or less angular and bent on the 

 abdomen ; both have somewhat similar shaped uncini. 



Paeaveemilia Bush 1905. 



Harriman Alaska Expedition, XII, pp. 221 and 223, 1905 ; this Journal, p. 

 54, 1907. 



Species of good size are found at Bermuda, usually in dead 

 coral, which agree in having a good sized bulbous four-sided 

 operculum protected by a horn-colored chitinous end varying 

 in form and composed of a number of pieces fitting closely one 

 above the other ; the peduncle attached to one side of the base 

 on a line with the front wall is rounded, much annulated, and 

 often curved in contraction. 



Branchial lobes in the form of rather stout, more or less 

 elongated, rounded stems, bear rather stout, about equal 

 branchiae arranged in a semi-circle ; crowded pinnse abruptly 

 decrease in length near the end of the rachis leaving a con- 

 spicuous oblanceolate or somewhat club-shaped terminal por- 

 tion varying in length in preservation, probably extensile in 

 life, the cells on the inner surface of the shorter ones being 

 much crowded. 



Thoracic membrane conspicuously developed, forming a 

 deep, much ruffled, 3-lobed collar, deepest in the middle, with 

 very large angular side lobes often overlapping medially, ex- 

 tending backward along the sides as a conspicuous border dimin- 

 ishing more or less abruptly between the 5th and 6th fascicles 

 of setae, not produced posteriorly. Seven fascicles of setae at the 

 end of six tori on the thorax. Setae long tapered blades with slen- 

 der lash-like ends, in the posterior bundles a few with broader 

 more curved blades with broader serrate ends, on the collar a 

 few inferior capillary ones resembling the slender ends of the 

 superior ones. The uncini form a single series along the poste- 

 rior border of ser^arate rectangular membranous areas succes- 

 sively increasing in size. They are narrow or thin in front view 

 with one series of striated teeth which in profile are sharp, 



