MUSEUM OF COMPARATIVE ZOOLOGY. 219 
far the greatest number of localities; they range from the littoral dis- 
trict to the greatest depths at which Cheetopods have been found by 
this expedition (955 fathoms, Station No. 29). They are represented 
by the greatest number of genera (Diopatra, Onuphis, Eunice, Mar- 
physa, Lisidice, Lumbriconereis, Arabella), and judging from the large 
number of their tubes found in many localities, they must form an 
essential part of the fauna. It is, however, easily seen that the various 
genera of this family show differences in their vertical range, the bearing 
of 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 floridana (Pourt.) judging from the occur- 
rence in great numbers of its paper-like irregular tubes, is a character- 
istic inhabitant of the littoral belt (as far as 100 fathoms). From deeper 
waters come the tubes of the Eunice tibiana (Pourt.); they descend (in 
the collection as far as 243 fathoms) about to the region where the- Euni- 
cidea of the species Diopatra and Onuphis appear, some of which build 
tubes which are frequently very peculiar.* Among these Cheetopods 
species now appear which perhaps belong exclusively to the deep sea, 
and which, on aecount of the large leaflike expansions of the anterior 
appendages, and the presence of very long hooklike curved bristles at 
the point, may well be separated from Diopatra as a new genus. I have 
already pointed out the appearance in the deep sea of such Diopatra-like 
forms, with the anterior appendages considerably expanded.t The Dio- 
patra group appears in this collection at about the hundred-fathom 
line; the group becomes particularly numerous at Station No. 44 at a 
depth of 537 fathoms, and has one representative at a depth of 955 
fathoms. 
In connection with the important part here taken by the Eunicide in 
the faunal combination of a marine area, it is interesting to remark that 
among the Annelids found in the lithographic shales of Bavaria the 
Eunicidee are just those which, in various forms, are most richly rep- 
resented. $ 
Among the other families found at great depths, the Polynoidee, 
with the Aphroditidee, may be especially mentioned. But as they are 
never found in communities, and do not, as a rule, build large tubes, 
* Here belong the flat, parchment-like tubes with cemented sponge spicules, and others 
mentioned by Pourtalés (Bulletin of the Mus. of Comp. Zool., Vol, I. p. 109) of Diopatra 
Pourtalesii, n. sp. 
+ Zeitschrift für Wiss. Zoologie, Bd. 25, p. 52. 
t Cfr. Paleontographica, XVII. p. 145. 
