138 LUMBRICUS. 
The best specimens I have had were from Zetland. 
Though the Lumbricus marinus appears a strong and hardy animal, 
it is of difficult preservation in confinement. The vessels receiving it 
should be deep, and contain a quantity of sand, always in a humid state, 
because they immediately shelter themselves, and absorbing it profusely, 
the pyramidal rolls are formed on the surface as it is discharged. 
This animal is vernacularly called the /ug or dung worm ; and it is 
very extensively used as bait, but, where accessible, mussels are preferred. 
These animals are dispersed in countless myriads on the various coasts of 
Scotland. 
Puate XIX. 
Fic. 1. Lunbricus marinus, Arenicola piscatorum, common species; a, 6, 
branchiz. 
2. Globular anterior. 
. Branchia, enlarged. 
. Lumbricus marinus, another species, or a variety of the former. 
. Globular anterior. 
. Branchie, enlarged. 
NID OP 0 
. Substances conjectured ova. 
Many of the Lumbrici are so much more indistinctly characterised 
than the preceding that I hesitate attempting to describe them, from 
my conviction of being unable to do so otherwise than in a very imper- 
fect manner. But considering it possible that some one feature, which 
others have not had an opportunity of observing, may occur in my 
specimens, I am induced to say a few words on the subject, trusting to 
better occasions whereby it shall be amplified. 
§ c—Loumpricts capitatus.—Plate XVIL., figs. 8, 9. 
Length, two or three inches ; thickness, half a line ; body round ; 
anterior extremity conical, pointed ; posterior extremity obtuse. The 
body is composed of numerous segments, each armed with three minute 
pencils of bristles, one on each side, the third on the middle of the back. 
