Invertebrate Animals of Passamaquoddy Bay. 91 
what has been termed a “beautiful network of hexagonal indenta- 
tions.” Hardly less delicate is the marking of the smaller Crenella 
glandida.) with its fine radiating lines on the exterior, and the 
interior pearl-like with a finely crenulate margin. 
In the next family (the Pectenidae) comes another of our import- 
ant food molluscs, the scallop {Pecteii tenuieo status ') . Very abundant 
in L’Etang and Chamcook harbors upon muddy bottoms, at depths 
of from five to eight fathoms, they are but seldom dredged. Highly 
esteemed in parts of the United States, they are little known and 
appreciated among ourselves, but the mollusc that is most appre- 
ciated, the oyster, is not found in the Bay. With regard to the 
latter, the conditions here seem to be unfavorable for its existence, 
for many years ago a large number were brought from abroad and 
placed in the Bay, and not only did they not increase, but those 
placed there soon died. We have, however, two species of the same 
family as the oyster, the little pearly Anomia epliijipium and the 
closely allied Anomia aculeata., both of them found attached to 
shells of the scallop. 
In the class Brachiopoda we have but one family and in that but 
one species, dredged in twelve fathoms in Friar’s Cove, Terebratula 
septentrionalis. They occur there clinging together in bunches, 
large and small together, and seem to prefer the clear fresh water 
u])on pebbly bottoms. This species was regarded by Dr. Gould as 
identical wdth the European Terebratulina caput-serpentis. This, 
however, is still a disputed point. If it is so, it is the oldest in time 
of all living mollusca. Huxley says of it : “ The longest line of 
human ancestry must hide its diminished head before the pedigree 
of this insignificant shell-fish. We Englishmen are proud to have an 
ancestor who was present at the battle of Hastings. The ancestors 
of Terebratulina caput-serpentis may have been present at a battle 
of Ichthyosauria in that part of the sea which, when the chalk was 
forming, flowed over the site of Hastings. While all around has 
changed, this Terebratidina has peacefully propagated its species 
from generation to generation, and stands to this day as a living 
testimony to the continuity of the present wdth the past history of 
the globe.” 
In the class Gasteropoda we have first the delicate little bubble 
shell Cylichna alba., which occurs at a depth of ten fathoms at sev- 
eral points. Two species of Chiton {Chitooi ruber and Chiton 
