128 
CLAVAGELLA coronata. 
TAB. CCCCLXXX. 
Spec. Char. Vagina elongated, crowned with 
dichotomously branched tubes, around a sul- 
cated disk ; free. 
Syn. Clavagella coronata, Deshayes, Coquilles Fos - 
siles de Paris . 8, t. 5. jig. 9 <§* 10. 
Tube or Vagina very gradually attenuated, at its larger 
extremity suddenly contracted, and then expanded into 
about eight regularly branched lesser tubes, arranged 
in two sets on the sides of a small disk that is divided 
in the middle by a furrow : the branches are at least 
thrice dichotomous ; the sulcus that divides the two sets 
has a branch that descends the side of the vagina in 
which the free valve lies : the valves are oblong, widely 
gaping, with large pointed beaks, waved by lines of 
growth, and both pearly within, thus differing from the 
tube which is in no other part pearly. 
Casts of this shell in a soft sand-stone, brought to 
England in ballast from the Tagus, were exhibited to 
the Linnean Society, by the late Mr. Sowerby, before 
the Genus to which Deshayes has referred it was known : 
they were accompanied by several other unknown shells, 
and by some known in the London Clay. Two views 
{fig. 2 and 3), one showing the beaks of both valves 
(jig. 3.), are added for illustration to this plate. The 
principal figure is taken from a specimen certainly En- 
glish, but as the label is lost, I am unable to ascertain 
whether from Hordwell, Barton, or Muddiford : the 
branches were until lately much concealed by the clay, 
and the specimen not much valued. 
Both this and the Tagus examples serve to show that 
the tube was not attached, (except possibly by the 
branches), for they are closely surrounded by other loose 
fossils : the shells about this are Corbula Pisum, Strom- 
bus Bartonensis (Murex M. C.), Volutae, and many 
others common in the London Clay. There are no re- 
mains of wood about it, by which the tubes of Tere- 
dines are generally surrounded. 
