1*78 



ANTHOZOA. 



Smilotrochus (?) Vancouverensis. (N. Sp.) 



Plate 20, figures 7 and la. 



Corallum small, shortly and broadly conical, not much higher than wide, 

 slightly curved, transverse section nearly circular in outline, upper margin 

 oblique, sides spreading and rapidly divergent, base acute. Calyx ap- 

 parently rather shallow, septa about thirty, extending from the outer wall 

 to within a short distance of the centre. Surface mia-ked with crowded, 

 smooth (?) radiating ribs. 



Greatest height, five lines ; breadth at the top, four lines. 



S. W. side of Hornby Island, in Division D; J. Eichardson, 1871. A 

 single, imperfect and badly preserved specimen. 



The surface markings are not well shewn, and the upper margin of the 

 coral is partly bi-oken away. The ribs and septa both appear to have 

 been smooth, and neither seem to have been elevated above, or to have 

 projected beyond, the up|)er margin of the coral. -The septa are so crushed 

 and distorted that it is impossible to make out their cyclical arrangement, 

 but they tippear to have been grouped originally in pairs, which coalesce 

 or unite at their inner terminations, and which alternate with simple, 

 entile septa. 



Platytrochus speciosus, of Gabb and Hoi-n,* is straighter than the present 

 species, its upper margin is more nearly horizontal, and its septa and 

 costffi are said to be both granulous and exsert. 



Smilotrochus curtus,'f of the Chico Gi-oup of California, has " the base 

 rounded or very blunt," and the "sides but slightly diverging." 



* "Journal of the Academy of Natural Sciences of PMladelpM^," New Series, Vol. IV., p. 399, 

 pi. 69, flgs. 15-lT. 



t •' Palseontology of CaUfornla," Vol. II., p. 205, pi. 34, flgs. 106 and 106a, 



