476 PHYLLOCHATOPTERUS ANGLICUS. 
by the small, slender, peristomial appendages. Peristomium forms a well-developed funnel. 
Body 24 to 6 inches in length; anterior region of twelve to sixteen segments (usually twelve), 
with a single tooth-like bristle. in the fourth segment ; median region has eleven to twenty- 
five segments. Tubes creeping, parallel, usually non-adherent, with short lateral connec- 
tions; more than one example in the same system of tubes; small subsidiary apertures 
at the end of branchlets (Potts). 
SYNONYMS. 
1914. Phyllochetopterus anglica, Potts. Proc. Zool. Soc., p. 984, pl. vi, text-figs. 9, 10 and 12. 
1915. ss P Allen. Journ. M. B. A., vol. x, p. 631. 
1922. is + McIntosh. Ann. Nat. Hist., ser. 9, vol. ix, p. 16. 
Habitat.—Trawled to the south of the Eddystone, Plymouth (Potts). _ 
This species was discovered by Mr. Potts at Plymouth in 1913, and though it presents 
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Fie. 173.—Tubes of Phyllochetopterus anglicus, about natural size. After Potts. 
Fia. 174.—Diagrammatic dorsal view of the head and anterior segment of Phyllochxtopterus anglicus, Potts, 
after Potts, showing the prostomium, pr., and the tooth-like bristle of the fourth segment. 
close relationships with forms he had met with on the Pacific Coast of Canada, and appears 
to be intermediate between P. prolifera and P. socialis, Clap., yet he considers that it merits 
specific distinction, not only because the tubes (Fig. 173) run parallel, and are not, as a rule, 
adherent, though connected, but from the morphological characters of the animal. Further 
investigations, however, in view of the cosmopolitan distribution of many similar forms 
and the necessity of allowing a wide margin for variations, may tend to minimise the present 
differences shown in the careful and well-illustrated description of Potts. 
The British species appears to live in water of some depth south of the Eddystone, and 
had been captured by trawlers. 
In connection with the structure of the peristomial appendages, Potts considers that 
since the second pair contain, as Claparéde pointed out in P. socialis, a few slender capillary 
bristles, they may represent the modified dorsal division of the foot of the segment. 
While giving a full description of the bristles, one of the larger forms of which is figured 
in Plate CXXXVI, fig. 12, Mr. Potts does not give details of the mimute hooks, which escaped 
