202 . Mr. MowTAGv's Account of some new and rare 
VERMES INTESTINA. 
BraNCHIARIUS. 
| Body irregular, sub-pellucid, destitute of eyes, tentacula, or 
any other appendage, but distinguished by lateral branchix. 
It has fallen to my lot to discover several species of marine 
Vermes that belong to the same family, but which differ so essen- 
tially from any thing that characterizes the present formed genera 
within my knowledge, that I have ventured to place them by 
themselves under the title annexed. As a specimen I have 
selected the following. 
BRANCHIARIUS QUADRANGULATUS, 
Tas. XIV. Fig. 5. 
Body long, nearly of equal size throughout, quadrangular, and 
furnished with tubercles along the angles; the sides with bran- 
chie; both the extremities are truncated, that of the anterior 
quadrilobated: the colour is pale orange, with two rows of 
curved black spots, one along each side; these in the contracted 
state of the animal appear like lineations, but when. extended 
are observed to be distinct on each articulation. 
Length exceeding two inches. 
This species has but rarely occurred on the south coast of 
Devon, and its history is of. course imperfectly known. I first 
discovered it amongst fuci at low water, destitute of any cover- 
ing; but as the locomotion of all the species hitherto noticed is 
extremely limited, their principal action consisting of bringing 
the two extremities together, and straightening alternately,it may 
be presumed that they form some case or covering for protection. 
Their 
