90 Mr. Montacu’s Description of several new or rare Animals, 
The locality of many of the productions of nature is frequently 
the cause of their remaining so long in obscurity, and not their ac- 
tual scarcity. This remark is exemplified in the present instance ; 
for in one particular spot in the estuary of Kingsbridge, con- 
tiguous to where the 4. ventilabrum is found in such abundance, 
as mentioned in a former paper, these are nearly equally plenti- 
ful, and, what is remarkable, each keeps its station, the line of 
demarcation appearing to be the separation of the coarser from 
the finer sand, and neither intrudes upon the other: this species 
is the highest, and consequently more frequently uncovered by 
the water at low tides ; the other lies in a small channel that is 
rarely dry. : 
These animals have been kept alive more than a month in sea 
water. 
NEREIS. 
NEREIS SANGUINEA. 
Tanz. 111. Fig. 1. 
Body long, slightly depressed beneath, and acuminated to- 
wards each end, but much more so at the posterior extremity ; 
the number of joints exceeds two hundred and seventy, about 
forty of which at the posterior end are of a much paler colour, 
and appear to be a reproduction; the rest of the body is of a 
fine bronze resplendent with changeable prismatie tints; the 
sides furnished with tridentate peduncles, from the middle of 
which issue a flat fasciculus of hair of a pale colour, and one 
large black bristle : about the twenty-eighth joint commence on 
each side branched cirri of a blood-red colour, which afterwards 
increase considerably in length; these originate from the upper 
part of each peduncle, and are usually hexafid, but unite above 
the base ; they are not retractile, but are generally carried erect 
and 
