TRYPANOSYLLIS ZEBEA. 169 



a general resemblance in outline of the body and processes, lie figures the bristles with 

 simple tips. Unless the artist overlooked the bifid nature of these organs, Malmgren's 

 form may be different. 



This form was described by Marenzeller (1874) as a new species from the Adriatic, 

 where Grube originally found it. His example had somewhat shorter cirri. He gives the 

 foot two spines and five or six bristles. The tail has a rudimentary cirrus between the anal 

 cirri. He saw only eleven of the anterior flat papillse in the proboscis, and the dorsal 

 tooth. The cseca of the gut are not mentioned. He compares it with Syllis hyalina, 

 Grube, and S. pellucida, Ehlers, but, on insufficient grounds, thought it different. He 

 figures a bristle with a short tip, but shows no serrations on the convex margin of the 

 dilated end of the shaft; indeed they are not readily seen. 



Langerhans (1879) cleared up the synonymy of this species. He also found it bud- 

 ding in November, the female stolon having violet ova, and the swimming-bristles 

 developing. In a male the sperms were roseate, and it had small (developing) swimming- 

 bristles. He gives a figure of two free female buds with ova, and in both a median and 

 two lateral tentacles are present. The frontal incurvation is small. He is not, however, 

 quite sure of their relationship, and they differ from the Tetraglene-buds of De St. 

 Joseph. 



Genus L. — Trypanosyllis, Glajoarede, 1864. 



Head with palpi well-developed as in Syllis. Eyes four, large ; tentacles large, long, 

 and distinctly articulated. Body proportionately large, with large dorsal cirri, alternately 

 long and short. Anal cirri two, with a median process. Ventral cirri lanceolate 

 (pinniform). Proboscis with an anterior row (in extrusion) of twelve flat papillae, and 

 behind a hook-like series of horny teeth. A single dorsal tooth. Foot truncate, bilobecl; 

 bristles with rather large terminal pieces which are boldly bifid. Reproduction by 

 stolons. 



This genus was established by Claparede (1864) for a species (identical with that 

 previously described by Grube as Syllis zebra) which he found .at Port-Venclres. 



1. Trypanosyllis zebra, Grille, 1860. Plate L, figs. 9 and 10— head and tail; Plate LI, 

 fig. 1; Plate LXX, fig. 8— foot; Plate LXXVIII, fig. 18— bristle. 



Specific Characters. — Head rounded trapezoidal, slightly narrower posteriorly where a 

 forward incurvation and a median hollow occurs. Eyes four, somewhat large, placed 

 anteriorly at the angles of a trapezium; the anterior slightly larger and wider apart than 

 the posterior. The median tentacle has about thirty articulations ; lateral a little shorter. 

 Palpi of moderate size, diverging anteriorly. Upper tentacular cirri very long with about 

 forty articulations. Body comparatively large, attaining a length of 5 cm., and about 

 1 — 2 mm. in breadth (De St. Joseph). Segments 190 — 215; slightly tapered anteriorly and 



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