STOLON FORMATION IN SPECIES OP TRVPANOSYLLIS. 413 
collected in the littoral zone daring the lowest spring tide at 
the end of May. 
(2) Off Brown’s Island, Friday Harbour, San Juan Island, 
State of Washington, U.S.A. Another single specimen, 
which came out of material dredged at a moderate depth. 
(3) In the neighbourhood of Victoria, Vancouver Island. 
Five individuals (one reproducing) were collected at the time 
of the very low spring tide on June 27th, at Macaulay’s 
Point, a locality made classical by Lord’s description in 
‘The Naturalist in British Columbia’ (Vol. II., p. 12). 
They were obtained under masses of Halichondroid sponges, 
only uncovered at the lowest point of the tide, and appear to 
exist in rounded tunnels in the sponge, or between the sponge 
and the rock, which they have themselves eaten out. There 
was no exit to the exterior or any indication that the worm 
usually leaves the shelter of the sponge. 
Three other specimens (one the posterior end of a repro- 
ducing individual) were found during the low tides of the two 
previous days on the shore near Beacon Hill Park. Here 
they existed amongst sponges and other encrusting organisms 
hidden under masses of kelp roots (Costaria). 
The animals are striking and even beautiful in appearance. 
'I’he largest was 94 mm. in length and 3 mm. in breadth, but 
there is a striking variation in size. The body is generally 
light brown or lemon-yellow, with the diverticula of the 
intestine showing through as a darker brown. The long 
moniliform dorsal cirri are generally white or pale pink, often 
touched with crimson or purple pigment, developed in some 
specimens over the whole cirrus, and it is their curling form 
and touches of colour which give a distinctive appearance to 
the species. In the individuals possessing stolons these are 
lemon-yellow in colour like the stock. 
Preliminary Descrii'tion of the Material. 
Various data with regard to the development of the worms 
collected are given below in tabular form. Numbers are 
