186 
thick as a crow quill; segments very numerous, quadrangular, 
slightly winged, as broad as long, the upper eight a little nar- 
rower, especially at the base, where it joins the lower portion. 
In addition to the small transparent branchial laminae on the 
ventral surface of each of the upper segments, there is an oval 
appressed scale. Intestine simple, containing sand and mud. 
Numerous ova are found at the lateral margins of each ring 
after the eighth. The setae of the eighth segment are very 
numerous and delicate, resembling in form the pendulum of 
a clock, while those of the lower rings are stronger, shaped 
like golf sticks. 
This worm shows no disposition to swim in water, but 
remains in one place, with the leaf-like snout curved upwards. 
The blood is colourless or nearly so, and I could make out 
no circulation as in many worms, but the margin of the 
snout is covered with a delicate net- work of vessels, and 
the tentacular papillae are each supplied with a vascular loop. 
These papillae are depressed at the apex, and supplied with 
muscular fibres like true suckers, but I have never seen 
them used to seize any object, or aid in progression. 
Arenicola piscatorum, Lam. Very abundant. 
Lumbricin^. 
Lumbricus lineatus, Mull. 
Very rare, among surface mud. 
L. capitatus, Johns. 
Only one specimen, constricted below the snout. 
L. pellucidus, Temp. (Clitelis minutus, Temp.) 
Found within putrid specimens of the heart urchin, and 
among other rejectamenta of the tide. 
Capitibranchiata. 
Pectinaria belgica . Lam. 
Empty tubes common, living worms occasionally found near 
low-water mark. 
