179 
jointed, the central one stout apiculate ; two lower antennae 
much longer, and exceeding the tentacular cirri. When 
viewed from the ventral surface, the basal portion of the 
antennae is nearly black, the three central ones converging 
like the rays of a tripod, of which the dark-coloured oblong 
oral opening forms the handle. Posterior segments after the 
fifteenth marked with four rows of stellate spots. 
Distinguished from P. asterince by the larger thin trans- 
lucent scales, which are firmly attached and not bordered, 
by the more numerous and slender setae, the equal upper 
antennae, and the absence of the ciliated processes on the 
dorsal surface. 
There is no other British species with smooth scales with 
which it is likely to be confounded. From P. spinifera, 
Ehlers, (which seems to me identical with Johnston’s P. 
scabra ,) and from P. peilucicla, Ehlers (Annelid. Chaetop., 
t. iii. f. 1 — 13), it inay be known by the scabrous cirri and 
antennae of those species. P. maculata, Grube, seems to be 
a form of P. cirrata, having the scales garnished with a few 
large papillae. 
SigaUon Carringtonii, nov. sp. Body vermiform, obtuse 
at both ends. Scales very numerous, attached to each ring, 
pellucid, outer border fringed with pectinate glands ; feet 
exposed, bifid, densely setiguous. Attached to the pedicel 
at the base of each foot is a curved ciliated cirrus. 
Met with occasionally, near low water mark, on the Birk- 
dale shore, buried in the moist sand, where it lies coiled in a 
spiral manner. First discovered in July, 1864, when ex- 
ploring the sands with my friend Mr. C. H. Brown, who 
named it as above. 
Body linear, obtuse in front, tapering very gradually to- 
wards the anal segment, which terminates abruptly in two long 
styles. Length two to three inches by two lines in breadth. 
Colour greyish-white, opalescent, reflecting prismatic tints. 
Feet very numerous, slender at the base, biram ous, upper 
c 
