262 
THE VOYAGE OF H.M.S. CHALLENGER. 
consisting of Algse, minute Crustacea, Polyzoa, Sponges, Foraminifera, and sandy mud 
containing numerous minute organisms. 
Parasites are rare in this family. 
The notion that the Eunicidse bore into telegraph -cables has been promulgated by so 
careful an observer as Mr. C. Stewart,^ now Conservator of the Museum of the Royal 
College of Surgeons of England. He says, speaking of the so-called Lithognatha worslei, 
that he has not been able to find a descrijDtion of any (Annelid ?) having calcareous jaws, 
and therefore “ this feature seems to me so important as to justify a distinct genus being 
made for it.” In this connection, however, it may be stated that it would be very difficult 
to find any representative of the families of the Eunicidse, Lumbrinereidse, Onuphididst', 
and others without such dental armature. Further, his having concluded that because it 
was the only form having calcareous jaws brought up with the cable off Singapore, it must 
have been the borer, is not altogether warranted. It is more likely that the species, 
like Nereis pelagica, and others under the same circumstances, simply took possession 
of the tube of a true borer (if it really occurred in it), and that its calcareous jaws 
had no connection Avith the making of that perforation. 
Nema ton ereis, Schmarda. 
Nematonereis schmardce, n. sp. (PI. XXXVII. figs. 6, 7, 8 ; PI. XVIII a. figs. 16—19). 
Habitat. — Dredged at Station 122 (off Barra Glrande, a little south of Pernambuco, 
on the coast of Brazil), September 10, 1873; lat. 9° 5' S., long. 34° 50' W. ; depth, 
350 fathoms ; surface temperature, 77°‘5 ; sea-bottom, red mud. 
A small form, measuring in its fragmentary condition about 18 mm. in length and 
a little more than 1 mm. in breadth. 
The body is slightly diminished in front, and the segments, with the exception of 
the first two, are narrower anterior to a line passing transversely at 12 mm. from the 
snout than posterior to it. 
The head (PI XXXVII. fig. 6) agrees with that of Sehmarda’s Nematonereis 
unicornis in regard to shape and position of the eyes (except that these are more 
distinctly lateral in the present form) ; but as the tentacle is only represented by a 
fragment of its base, comparison in this case is lost. The under surface of the snout 
presents a deep median groove. 
The dental apparatus of this form approaches that of the Eunicidse. The maxiUse 
(Fig. 26) have a broad base, and taper to a blunt and somewhat abruptly curved point. 
As in other organs of the same kind the basal region is hollow, and the horny invest- 
ment increases in thickness toward the tip. The left great dental plate has five or six 
1 Jouni, Roy. Micr. Soc., ser. 2, vol. ii. pp. 717-719, pi. ix., 1881. 
