246 On the Morphology of the Blastoidea. 



of T. subcylindricuS) Hall sp., and the radial angles are very 

 different in the two forms, while the longradials of T. lineatus, 

 SSlium., and the appearance of its orals in a side view of the 

 calyx are sufficient to distinguish it from T. hispanicus. 



Locality and Horizon. Colle, near Sabero, Spain ; Lower 

 Devonian. 



Genus Phjenoschisma, E. and C. 1882. 



Phcenoschisma nobile y sp. nov. 



Spec. char. Calyx elongately pyramidal, with the summit 

 flattened, and strong interradial processes which terminate but 

 little above the level of the peristome. Radials arched, very 

 long and narrow, the body and limbs being about equal in 

 length. The radial sinuses between them are deep and ex- 

 ceedingly wide, with high sloping sides, the edges of which 

 are prominent and a little thickened. The oral plates are 

 large and form the summits of the interradial processes, one 

 of which is truncated by the triangular-pyriform anal opening. 

 Ambulacra linear, of uniform width throughout. Lancet 

 plates occupying their entire width, and completely covered 

 by the side plates, which are more than twenty-five in num- 

 ber and somewhat wedge-shaped. Outer side plates very 

 small, placed at the extreme edge of the ambulacra, and 

 standing almost vertically so as to fill in the notches between 

 the outer ends of the side plates. Hydrospire-slits more than 

 thirty in number and closely crowded together, so as to give 

 a corrugated appearance to the sides of the sinuses. Diameter 

 of summit 25 millim. Height of another specimen 36 

 millim. 



Obs. This large and remarkable form is intermediate in 

 character between Ph. Verneuili, nob., and Ph. aculum, Phill. 

 p., both of which, however, are of much smaller size. It 

 resembles the first in the form of its plates and ambulacra and 

 in the arrangement of its hydrospire-slits, but differs in pos- 

 sessing a truncated summit ; for the median ridges of the 

 oral plates do not slope downwards towards the peristome, as 

 in Ph. Verneuili. In this character, however, Ph. nobile 

 resembles Ph. acutum, though readily distinguished from it 

 by the form of its radial sinuses and ambulacra. It also differs 

 from the other species of the genus in the unusual abundance 



of its hydrospires, and in the more excentric position of the 

 anal opening. 



Locality and Horizon. Colle, near Sabero, Spain ; Lower 

 Devonian. 





