204 H. A. Nicholson on Cornulites and Tentaculites, 
ful examination, however, of this portion of the fossil has con- 
vinced me that the exterior of the tube presents the same 
appearance as the cast, consisting, namely, of a series of imbri- 
eated rings. There are, therefore, no traces of the longitudinal 
strize which distinguish the outer surface of the tube of Cornw 
lites serpularius. é 
The casts of the tubes of Conchicolites gregarius (fig. 2 6) have 
exactly the characters of those of Cornulites serpularius, but on 
a greatly reduced scale. Each consists of a succession of short, 
imbricated, conical rings, the wider ends of which are directet 
towards the smaller end of the tube, whilst their surface 1s 
smooth. From their small size, the casts, on a cursory examina- 
longitudinal strie of the external surface. al 
Locality and formation.—Wenlock limestone of Dudley 
and Ludlow rocks of Westmoreland, England. _ 
Concuicouires Nich.—Animal social, inhabiting a caleate 
ous (?) tube, attached in clustered masses to some solid olor 
The tube is conical, slightly curved, attached by its sm fae 
extremity. The wall of the tube is thin, its external su a 
devoid of longitudinal strie. The tube thin, composed of sho?! 
imbricated rings, but apparently destitute of any cellular ee® ‘ 
ture. Cast of the tube com of short conical rings, its SU? 
face completely smooth, and destitute of strie or furrows. 
