and a new genus Conchicolites, 205 
Conchicolites gregarius Nich.—Tubes closely in contact, at- 
tached by their smaller ends to dead shells. Tube varying in 
length from + to $ an inch, and having a diameter at its mout 
of about half a line. Conical rings which compose the tube 
about four in the space of a line. 
rom the great similarity presented by casts of the tubes of 
this species to those of Cornulites, I was at first disposed to 
sdpnid this as a small example of the latter genus. more 
of its tube. In the face of these differences, it is somewhat 
singular to find that the internal casts of the two should be so 
absolutely undistinguishable except in point of size. Conchaco- 
lites presents some resemblances to the genus Salterella of 
Mr. Billings, defined as consisting of “small, slender, elongate- 
conical tubes, consisting of several hollow cones placed one 
within another, the last one forming the chamber of habitation 
of the animal.’ In Salterella, however, the tubes appear to be 
solitary, and no evidence has been adduced to show that they 
were attached to foreign bodies, though Mr. Billings regards 
them as allied to Serpulites. 
ality and formation.—Conchicolites gregarius occurs not 
uncommonly attached to the shells of Orthoceras Brongniarti, 10 
— flaggy shales of Caradoc age, Dufton, Westmoreland, Eng- 
an 
Tl. TenTACULITES. 
It may not be out of place to add here a few remarks on the 
genus Tentaculites of Schlotheim, though most paleontologists 
eading opinions as to the nature of the fossils in question, some 
arding them as tubicolar annelides, whilst others, followin 
Austin, refer them to the P A 
n s d 
whilst Tentaculites has been referred to the tubicolar annelides, 
