Zool.-Vol. I.] JOHNSON— PACIFIC COAST ANNELIDS. 183 



Schmarda 1 and subsequently by Ehlers 2 . I have not had 

 access to Schmarda's original description, but Ehlers' 

 figures and diagnosis of P. folytricha show that that species 

 differs in two or three important points from the present 

 form. The palpi of Harmotho'e hirsuta are terete, not an- 

 gular; the eyes are four instead of two (Ehlers possibly 

 overlooked the anterior pair, however), and the foot is 

 shorter. Notwithstanding these differences, the two forms 

 are exceedingly alike in a number of important characters, 

 and may yet prove to be merely varieties of a single species. 



Harmothoe crassicirrata, sp. nov. 

 Plate VI, Figs. 25, 26; Plate VII, Fig. 39; Plate VIII, Figs. 54, 55a, b, c. 



Form rather stout and thick, tapered considerably towards the head; (poste- 

 rior somites back of twenty-fifth wanting). 



Prostomium (fig. 39) with lateral lobes well defined, anterior peaks promi- 

 nent, acute, median fissure broad, reaching back about one-half the length of 

 prostomium. Tentacle with broad, conical, basal segment, reaching a little 

 beyond tips of prostomial lobes. Tentacle shorter than peristomial cirri, but 

 nearly twice the length of the antenna?. The latter inserted below the level of 

 the tentacle, their basal segments enormously thick and in all respects resem- 

 bling the basal piece of tentacle. Flagellum of antennas nearly equal in 

 length to all the rest of the antenna. Eyes four, anterior pair much the 

 larger, lateral, protuberant, placed about midway of length of prostomium 

 and in its widest region. Posterior pair about one half the diameter of the 

 anterior ones, placed far back near base of prostomium. 



Peristomial cirri very similar to tentacle, but considerably longer and thicker. 

 The basal joints of dorsal and ventral cirri are fused for nearly their whole 

 length. The dorsal cirri (fig. 25) clavate, and much thickened. All cirri, ex- 

 cept ventral, papillate to some extent, the dorsal the least so. 



Parapodia (figs. 25, 26) divided into very unequal rami, both with a long, 

 cylindrical, finger-like, terminal process. Setae of dorsal ramus very few 

 (8-16), but enormously stout (figs. 55a, b), dark, minutely serrated their whole 

 exposed length. Ventral setae much more slender and numerous (fig. 55c), 

 toothed at tip. Elytra probably 15 pairs, borne on somites 2, 4, 5, 7 . . . . 

 23, 26?, 29?, 32?; thin, very broadly reniform (fig. 54), very smooth, and 

 minutely flecked with brown pigment. 



Measurements.— Greatest width of body, 7.5 mm.; length of 25 somites, 

 20 mm. 



1 Neue wirbellose Thiere, i, ii, p. 156. 



"The "Blake" Annelids, Mem. Mus. Comp. Zool. Harvard College, Vol. XV, p. 49, PI. 

 X, figs. 9, 10, PI. XI, fig. 1. 



( 3 ) December 8, 1897. 



