58 
THE VOYAGE OF H.M.S. CHALLENGER. 
eight to ten frontal appendages, whose length is somewhat greater than the breadth of 
the frontal margin itself ; the appendages are more or less arborescent, somewhat flattened 
and smoother on the under surface, they are irregularly bi- and tripinnate, the branches 
being mainly developed upon the margins of the stem ; the terminal blanches are 
elongated and conical, sometimes strongly drawn out ; between the branches are frequently 
minute cones or branchlets ; a number of small, simple, or tufted processes are often 
found between the main appendages of the frontal margin; close to the outer and hinder- 
most of these is the round opening of the rhinophoria on either side with a slightly 
prominent unevenly notched margin. 1 The rhinophoria are strong ; the shorter and 
more delicate stalk 2 is sharply marked off from the club, which was somewhat bent 
backwards ; the rounded pyramidal club has about fifty broad thinnish leaves on either 
side, the short strong terminal papilla has an oval contour. The head is rather large ; 
on either side is a tentacle , which has the appearance of a fold of the skin with a free 
lobe-like inferior extremity; its length is 2 '5 mm., and its breadth at the base 1 mm. ; 
on the anterior side of the free extremity there is, as in Euplocamus jciponicus, an 
indistinct furrow. The mouth-tube in this specimen was retracted, and the short cylin- 
drical labial disk (yellow in colour on account of the strongly developed cuticle) projected 
2*5 mm. ; at the rounded truncated anterior extremity was the narrow perpendicular 
oral aperture. From the hinder portion of the frontal margin runs on either side, along 
the edge of the back, a low fold as far as the root of the tail, in which it vanishes. 
From this dorsal margin arise on either side five dorsal appendages, of which the two 
hindermost are closest together ; the rest being separated by nearly equal intervals, and 
placed each almost exactly opposite its fellow. The first was situated behind the 
region of the rhinophorion, the last at the junction of the back and tail. The dorsal 
margin between these appendages was somewhat undulating, and here and there prolonged 
into very small appendages. 3 These appendages exactly resembled those of the frontal 
margin, but had their branchlets more extended. 4 The hindermost appendage on 
either side was about double the size of the others, and formed of two appendages fused 
at the bases, of which the anterior was lower than the posterior. The branchia is 
formed of three broad and flattened tripinnate branches, the middle one being rather 
larger than the other two ; from the base of the lateral branch, especially the left hand 
one, was given off outwards a strong branch ; this indicates five branchial tufts as a 
number which is probably present in other individuals. The low truncated cylindrical anal 
papilla has a length of about '6 mm., and entirely resembles that of other species of 
Euplocamus f the margin of the opening is undulating; masses of food were projecting 
from the wide anal opening, and could easily be drawn out. At the base of the right 
1 Bergh, loc. cit., p. 626, Taf. xi. fig. 9, a. 
3 Loc. cit., Taf. xii. fig. 7. 
5 Loc. cit., Taf. xii. fig. 9. 
2 Loc. cit., fig. 9, b. 
4 Loc. cit., Taf. xi. fig. 11. 
