Gatty Marine Laboratory, St. Andrews, 11 
Gephyrean? A. Ina tow-net at 600 fathoms, during the 
work of the ‘Triton,’ on the 20th August, 1882, a minute, 
badly preserved form occurred in the débris. Little more 
could be made out of the specimen than that it was a 
minute slender annelid in a pulpy condition, yet at one end ° 
it presented under the microscope two groups of remarkable 
bristles, unknown in the history of the Polychets, so far as 
can be ascertained. These consisted of comparatively large 
curved bristles (Pl. III. fig. 9), one end terminating in a 
blunt point, the other gradually dilating into a broad blade 
with an oblique base, the dilated region which appears to be 
thin having a series of oblique striz, which in some views 
simulate fibres. These bristles are evidently hollow, with 
comparatively thin walls, especially at the base, and the 
membranous central region may readily be thrown into 
striz by the solution. ‘The convex outline presents a double 
margin, as if the chitimous tissue were thicker there. 
The structure of these bristles is peculiar, and it may 
be they belong to the Gephyrea, though the minute and 
elongated outline resembles that of an Oligochete. The 
condition of the specimen, however, is most imperfect. 
Before mounting in Farrant’s solution it was thought that 
somewhat triangular, diaphanous hooks appeared in the 
softened tissues, but none could be detected thereafter. One 
hooked bristle, however, was observed (Pl. III. fig. 10), with 
the same thin shaft as the larger bristles figured, but a 
peculiar separation or modification of the inner layer of the 
bristle appears to have taken place near the tip, the central 
axis remaining entire. Such a type of bristle has no con- 
nection with the large forms with the expanded bases. 
All are exceedingly diaphanous. These brief notes may be 
sufficient for the identification of the form by subsequent 
observers. 
Another peculiar form, apparently Gephyrean, and which 
may be termed Phascolosoma lankestert*, was dredged in the 
‘Porcupine’ Expedition of 1870, in 60-160 fathoms, east of 
Cape de Gatte. It inhabited a clear soft tube resembling 
that of Placostegus. It is a small form (Pl. II. fig. 11), 
barely half an inch in length, of a pale yellowish colour, 
nearly cylindrical in outline, but having a long process, 
widened at its extremity anteriorly, whilst posteriorly it is 
rounded and papillose. On each side of the base of the long 
* In honour of my old and distinguished friend Sir E. Ray Lankester, 
K.C.B. The Phascolosoma ohlina of Théel (Swedish Antarct. Hxped. 
1911, p. 29) presents similar papillz posteriorly, but differs in other 
respects. 
