NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 45 



In addition, (1) Heptaceras Ehlers (1868, p. 284) has been erected 

 for a Diopatra-like form from Ceylon, in which the frontal antennae are 

 said to be long, filiform, resembling the occipital tentacles in length, and 

 (2) Paronuphis Ehlers (1887, p. 73) for a form which Augener (1932, 

 p. 38) has referred to Flyalinoecia, since it is believed to represent a juve- 

 nile of this genus. (3) Paradiopatra Ehlers (1887, p. 75) was erected as 

 a subgenus of Diopatra^ with 2 species, P. fragosa and P. glutinatrix, both 

 from Florida. The genus was thought to be an abranchiate Diopatra, but 

 at least one of its species, P. glutinatrix, was later (Augener, 1906, p. 

 142) shown to have trifid branchiae, hence referred to the genus Onuphis. 

 The other species, P. fragosa, requires re-investigation. However, 3 other 

 abranchiate species of Onuphis have been described by other authors, and 

 might come under this category (Paradiopatra) if it is retainable; these 

 are O. minuta Mcintosh (1885, p. 334) from New Zealand. O. som- 

 breriana Mcintosh (1885, p. 310) from the West Indies, and O. notialis 

 Monro (1930, p. 129) from the Antarctic region. Unfortunately for 

 this view, the collections herein reported contain some specimens believed 

 to be very close to a species of Nothria (N. stigmatis, p. 89) so as to 

 be at most of subspecific rank, since they agree with the stem species in 

 all respects save that branchiae are totally lacking. A similar variation in 

 number of branchial structures is to be found in O. nebulosa (p. 75) ; it 

 seems that the actual distribution of branchiae or the amount of their 

 branching, when limited to a few filaments, has doubtful specific value in 

 this group. 



Since separation of some of these genera (see key above) depends on 

 the amount of branching of branchial structures, and since this is unques- 

 tionably a variable character at least in some species (see below under 

 Nothria stigmatis and Onuphis nebulosa), it may become necessary to 

 refer some genera in the key above to others ; thus, Leptoecia may prove 

 to be only an abranchiate form of Hyalinoecia and Paradiopatra an 

 abranchiate Onuphis. Such a conclusion necessitates further investiga- 

 tion, especially of all setal structures of the species involved. 



Five genera of those keyed above are present in the collections of the 

 Allan Hancock Foundation. These are Hyalinoecia, Rhamphobrachium, 

 Diopatra, Onuphis, and Nothria. The other 3, Epidiopatra, Leptoecia, 

 and Paranorthia, are small, known through only one or 2 species each. 

 Epidiopatra Augener (1918, p. 355) is known through only 2 African 

 species, E. hupferiana and E. drewinensis, described by the same author. 

 Paranorthia Moore (1903, p. 448) is known for a single species, P. brevi- 

 cornuta Moore from Japan. Leptoecia Chamberlin (1919, p. 264) is 

 known through only 2 species, L. abyssorurn Chamberlin off western Peru 

 and L. antarctica Monro (1930, p. 133) from the Antarctic. 



