514 
THE VOYAGE OF H.M.S. CHALLENGER. 
each other. This forms the basis for the thick layer of glandular tissue hning the 
alimentary canal, and consequently the disposition of the parts is noteworthy. 
This species aj)proaches Schmarda’s Protula appendiculata,^ from Jamaica, in regard 
to the tube, but differs from it in other respects. 
Apomatus, Philippi. 
Apomatus elisahethce'^ n. sp. (PI. LIV. fig. 4; PI. XXXIa. figs. 21, 22). 
Habitat . — Trawled at Station 167 (a little to the east of the sound between the 
north and south islands of New Zealand), June 24, 1874; lat. 39° 32' S., long. 171° 48' E. ; 
depth, 150 fathoms; surface temperature, 58°'5 ; sea-bottom, blue mud. 
The total length of this species is about 18 mm., of which the branchiae measure 
about 8. The diameter of the body in the anterior thoracic region is 1 ‘6 mm. 
This species differs from the British representative of the genus [Apomatus ampulli- 
ferus, Phil.) in the great proportional length of the branchiae, and in the presence of a 
broad membranous wing on the radioles on each side of the pinnae. The portion of the 
fan united by a common web interiorly is very short, viz., only a small margin above the 
edge of attachment, and a fragment at the base of each radiole. The radioles throughout 
the rest of their extent are quite free. The membranous wings are not much developed 
at the base, but widen on each side about the middle of the process, and continue as 
broad lamellae to the tip, the smooth filament terminating the organ being thus abruptly 
distinguished. The flattened region of the radiole seems to be formed by the hypoderm 
and cuticle. The pinnae are richly ciliated, and the terminal filament also shows a few 
fine cilia toward the tip, but whether these be vibratile or only palpocils could not be 
determined. One of the branchiae (probably the second dorsal, but there is difficulty in 
distinguishing, since the branchiae were separated and fragmentary), while resembling the 
rest in other respects, has at the tip a globular process which is much less in proportion 
than in the British form. Three or four of the radioles at the side of the fan opposite 
the globule are short and rudimentary, the wings especially being deficient. 
The cephalic collar forms a prominent ridge all round the front. It is entire ventrally, 
but has a notch in the mid-lateral region at each side. Turning backward from the great 
dorsal frill at each lateral angle, it passes under the bristles, and forms a broad apron 
behind the thoracic boundary. 
There are seven setigerous processes in the thoracic region. The first as usual 
occupies a dorsal position considerably in front of the others, the rest being lateral, and 
directed upward and backward. The bristles (PL XXXIa. fig. 21) are comparatively 
^ Neue wirbell. Thiere, I. ii. p. 3.3, Taf. xxii. fig. 185. 
2 Named after my best aid in marine zoology. The title of the remarkable Euphione elisabetJicehsi5 the same origin. 
