IDENTITY OF SOME MARINE ANNELIDS—HARTMAN 119 
determined the plates are symmetrical on the two sides.” This 
differs, therefore, from Z. parva-pedata only in that maxilla II has 
a different number of teeth, but as pointed out above the exact out- 
lines are sometimes difficult to discern; also, the number of denticula- 
tions is not sharply distinctive. In other respects these two are so 
similar that separation is difficult. 
i; 
dik g 
_ Ficure 11.—Species of Peratoproctus, Dritonerets, and LumBriNnerIs (enlarged). 
a,b, Petaloproctus filifer (U.S.N.M. No. 5214): a, Outline of an anterior parapodium; 3, 
_ posterior end in dorsal view. 
¢, d, Drilonerets robusta (U.S.N.M. No. 15813): c, Mandibles; d, maxillary carriers, unpaired 
piece and plates. 
e+g, Lumbrinerts erecta (cotype, No. 2585, Philadelphia Acad. Nat. Sci.): e, Tenth parapo- 
_ dium; f, a median parapodium; g, a posterior parapodium. 
h, Lumbrineris maculata (U.S.N.M. No. 16018): Prostomial lobe in ventral view, showing 
specimen with elongate lobe. 
Another related species is Z. robusta Ehlers (1887, p. 104) from 
Florida, in 75 fathoms, and Habana, in 175 fathoms. It also has 
massive maxillary carriers and small maxillary plates; parapodial 
lobes are short throughout and have similar outlines. Maxilla II 
has five teeth. According to Ehlers, however, maxilla III has only 
one tooth, and the mandibles are separated at their bases for a 
greater distance. Most importantly, the body proportions are less 
attenuate, such that 182 segments measure 68 mm. long and 5 mm. 
wide. 
LUMBRINERIS MACULATA (Treadwell) 
Fieurses 11, h; 14, d, e 
Lumbriconereis maculata TREADWELL, 1902, p. 198 (U.S.N.M. No. 16018; Puerto 
Rico). 
