530 
THE VOYAGE OF H.M.S. CHALLENGER. 
liook are wide, and have peculiar intermediate transverse markings, like those on certain 
feathers. 
The tube forms a single coil, which measures from 3 to 5 mm. across, according to 
the direction of the axis ; but a terminal piece apparently pertaining to it is not included 
in this calculation. The tube is finely marked with somewhat waA^y transverse ridges, 
except on the free part, which has only one or two isolated transverse processes and 
some longitudinal ridges. The aperture of the tube is round. A smaller tube runs 
outside the foregoing in the attached portion at the margin. 
The hooks thus differ from those of Spirohranchiis {Cymospira) giganteus, Pall. 
(British Museum specimens, from St. Vincent, West Indies), in having a well-marked 
dorsal inflection, in the great projection of the anterior bifid process, and in the nature 
of the outline beneath the latter. The hooks of Cymospira hracliycera, Baird, from 
Australia, also have a very diagnostic shape, the anterior inferior process being short and 
turned' upward. A small form, Cymospira decumbens, Sowerby, occurs in the same 
collection from Van Diemen’s Land, and differs from the Challenger form in the 
operculum and uncini. Grube does not figure the hooks of his Philippine species of 
Spirohi'anchus [Serpida tricornigera and Serpida quadricornis), and thus their relation- 
ship is in some respects uu certain. 
Spirorhis, Daudin. 
Spirorbis sp. (?) 
Habitat. — A fragment occurred on Polyzoa dredged at Station 149 g (off Christmas 
Harbour, Kerguelen), January 29, 1874; lat. 48° 50' S., long. 69° 18' E. ; depth, 110 
fathoms; surface temperature, 40° '2 ; sea-bottom, volcanic mud. 
A fragment of a coiled tube, apparently belonging to the Serpulidae, comes from the 
Admiralty Islands. It has a diameter of 2'5 mm. and a length of 17 mm., is marked 
by transverse wrinkles and a few longitudinal furrows. It is nearly round, the attached 
parts being flattened, and a slight ridge occurring here and there. A spinous Lepralia 
is attached to a sheltered portion of the external surface. 
Another empty, smoothly rounded tube, somewhat regularly coiled round a central 
axis which is hollow, was trawled at Station 201 (ofi* the Philippines, Basilan Strait), 
October 26, L874 ; lat. 7° 3' S., long. 121° 48' E. ; depth, 82 fathoms; surface tempera- 
ture, 83°'0 ; sea-bottom covered with stones and gravel. The tube is a long one, with a 
diameter at its widest part of 2‘5 mm. This coiled arrangement round an oblique (hollow) 
axis is |Deculiar. Externally are various Lepralia. 
