CHARACTERISTIC DEEP-SEA TYPES. — WORMS. 55 
Of the families here enumerated, none has so important a 
bearing on the character of the faunal region as that of the 
Eunicide. Their representatives are found in far the greatest 
number of localities; they range from the littoral district to 
the lowest depths at which chztopods have been dredged by 
the “ Blake.” They are represented by the largest number of 
genera (Diopatra, Onuphis, Eunice, Rhamphobrachium (Fig. 
268), Marphysa, Lisidice, 
Lumbriconereis, Arabella), 
and, judging from the large 
number of their tubes met 
with in many localities, they 
must form an essential part 
of the fauna. It is easily 
seen, however, that the va- 
m = rioug genera of this family 
Rhamphobra- Show differences in their ver- 
chium Agas- tical range, the bearing of 
Sd T which will perhaps be more 
clearly understood when the conditions 
of temperature of their habitat are taken 
into account in connection with it. Thus 
the Eunice conglomerans, judging from 
the abundance of its paper-like irregular 
tubes (Fig. 269), is a characteristic in- Fig. 269. — Eunice conglom- 
habitant of the littoral belt, as far as ia 
100 fathoms. From deeper waters come the tubes of the unice 
tibiana Pourt.; they descend to 243 fathoms, about to the re- 
gion where the Eunicidea of the species Diopatra and Onuphis 
appear, some of which frequently build very peculiar tubes; 
such as the flat, parchment-like tubes with cemented sponge 
spicules of Diopatra Pourtalesii, and others mentioned by 
Pourtalès in his preliminary account of the results of his first 
expedition. 
Among these chetopods species now appear which perhaps 
belong exclusively to the deep sea; they are separated from 
Diopatra-like forms, with large leaf-like expansions of the ante- 
rior appendages, and with long hook-like curved. bristles at the 
