972 MR. F. A. POTTS ON 
there is no such development of glandular papille on their dorsal 
surface as is figured in the Neapolitan species (but absent in 
1’. bonhouwrei). ‘he parapodia throughout consist, as is usual, of 
a bifid notopodium with capillary sete, a lateral accessory lobe 
such as occurs in Phyllochetopterus, and a double neuropodium 
consisting of two adjacent uncinigerous ridges. There is, more- 
over, in all the segments a very distinct, occasionally double, 
papilla just anterior to the notopodium. ‘This may be the 
nephridial papilla, but, if so, its position is more dorsal than 
usual. 
The ventral surface of the anterior region is deeply tinged 
with a brown to purple pigment. In thisit apparently resembles 
T. costarum, while in 7’. bonhowrei the 7th segment alone is 
markedly pigmented. 
From the points which have been stated here it will be seen 
that the form certainly differs specifically from 7’. bonhowrei and 
probably also from 7’. costarwne. 
PHYLLOCH EroPrEeRUS Grube. 
PHYLLOCHATOPTERUS PROLIFICA, Sp. n. (Plates 1V., V.; Text- 
fig. 11.) 
Phyllochetopterus of small size (1-3 em. in length), with eye- 
spots. Anterior region usually with 12 setigerous seyments; a single 
enlarged seta in each parapodium of the 4th segment. Median 
region with a very variable number of segments. In segments of 
posterior region each notopodium contains a single seta. Tubes 
creeping, usually containing several individuals and possessing 
several short branches opening to the exterior. 
This species of Phyllochetopterus was first collected outside 
the harbour of Nanaimo. Here, as was proved by frequent 
dredgings between the Five Finger Rocks on the north and the 
island of Gabriola to the south, the muddy bottom is covered 
with a thick growth of hexactinellid sponges (Bathydorus dawsoni, 
Aphrocallistes whiteavesii), and associated with these are the thin 
and delicate tubes which prove to contain Phyllochetopterus, 
sometimes sparsely scattered, sometimes in such thick and 
tangled masses that the dredge contained little else. Later in 
the year, a visit to the Marine Biological Station of the Uni- 
versity of Washington at Friday Harbour showed that this 
annelid oceurs abundantly in various localities in Puget Sound. 
It was dredged at many points in the San Juan Archipelago 
and found associated with very different companions. In the 
dredgings from deeper water (down to 60 fathoms) masses of 
large barnacles (Balanus aquila) and the tubes of the Polychet 
Sabellaria also occurred; in shallower waters (up to 5 fathoms) 
the Phyllochetopterus tubes were entwined with red seaweeds. 
But though the vertical range as seen above is fairly notable, it 
never occurs above low-tide mark, where it is succeeded by the 
other members of the family, MJesochetopterus and Telepsavus. 
