IDENTITY OF SOME MARINE ANNELIDS—HARTMAN 131 
Family MALDANIDAE 
Genus PETALOPROCTUS Quatrefages 
PETALOPROCTUS FILIFER (Verrill) 
Fiaeure 11, a, b 
Maldane filifera VeRRitt, 1880, p. 179 (U.S.N.M. No. 10486; Cape Cod Bay). 
Lumbriclymene filifera VERRILL, 1900, p. 659. 
Petaloproctus filifer ARwipsson, 1907, p. 114. 
There is a single specimen, labeled “Type. Mastigomaldane filifera 
(Verr.). Cape Cod Bay. Aug. 30, 1879. Sta. 321. 2914 fms. Speed- 
well.” It is in several pieces, perhaps of an immature individual. 
No color remains. The anterior end lacks a cephalic plaque, is 
broadly rounded, turned ventrally (fig. 11, a). The first three seg- 
ments are shorter than the fourth. There is a long, preanal, 
achaetous segment, with a well-rounded, simple anal plaque. The 
anal aperture is turned dorsally (fig. 11, b). Some median seg- 
inents have long, hairlike setae, as typical of Petaloproctus. 
Verrill (1900, p. 659) transferred this species to Lwmbriclymene, 
with the statement that it “does not belong to Petaloproctus as St. 
Joseph supposed, but rather to Lwmbriclymene Sars, but it differs 
from the type, so that the generic characters should be altered some- 
what. Its anal region consists of a somewhat flattened cone, turned 
up dorsally and nearly acute, but without a limbus. The small anus 
is close to the tip on the dorsal side of the segment, while the oblique 
postero-ventral side may be flat or concave. The head has a central 
carina with a pit each side of it, but no definite plate or limbus. 
The anterior ventral tori contain one or two spiniform setae. The 
two short preanal segments have small tori, but no setae.” This 
agrees reasonably well with the conditions in the type specimen, 
and is here referred to the genus Petaloproctus. 
Arwidsson (1907, p. 114, 118) has referred this species questionably 
to his P. tenuis borealis; the similarities are indeed striking. The 
synonymy appears to be justifiable. Verrill’s name has priority. 
Genus PRAXILLURA Verrill 
PRAXILLURA ORNATA Verrill 
Pravillura ornata VeERRILL, 1879, p. 179 (U.S.N.M. No. 118538; off Race Point, 
Cape Cod, Mass., in 25 fathoms). 
The single type is in several pieces, or the pieces may represent 
more than one individual. If only one, there are well over 20 (or 
25) segments. The head is that of a Lumbriclymenini, the lobe well 
rounded, smooth, turned down anteriorly so that the mouth is clearly 
ventral. Nuchal slits are shallow, crescentic. The material is 
unsatisfactory. 
