REPORT OF THE DIRECTOR I9IO 211 



striae." On plate 7 of Bulletin 107 I figured some stem joints and 

 roots, answering this description, which were associated with 

 Blastoidocrinus remains. I there said that these " may belong to 

 this species." A careful examination of the type shows that the 

 joints of its column are not like those figures. The stem joints 

 of the type have convex rather than cylindrical edges and I do not 

 find any evidence for the possession of " strong radiating striae " 

 on their flat faces. 



No sutures could be seen on the stem joints even when examined 

 under water in sunlight with a compound microscope. The lumen 

 seems to be very small but may weather out to leave '' rings " like 

 those which are also abundantly associated with the remains of 

 Blastoidocrinus on Valcour island and elsewhere. 



Genus CLIOCRINUS E. Billings. 1856 



Among the crinoid remains of the middle Chazy of Valcour 

 island are some well-preserved plates of Cliocrinus clearly 

 showing, along the lines of suture, a series of cylindrical perfora- 

 tions w^hich are perpendicular to the surface of the plates. The 

 largest fragment found contains but little more than thirty plates, 

 yet these present characters which (aside from the horizon from 

 w^hich the specimen w^as taken) indicate that the form is specifi- 

 cally distinct from the described Trenton species. As I w^ish to 

 make several references to this Chazy form and as I believe its 

 plates show characters which may be recognized in more com- 

 plete specimens, I have made it the type of a new species. 



Cliocrinus perforatus nov. 



Description of the type. Brachials differing from those of 

 C. m a g n i f i c u s Bill, in the possession of a low median ver- 

 tical fold about 0.2 mm wide. The fold shows more clearly 

 at the middle of the plate where there is a shallow^ depression on 

 each side of it. Both above and below these depressions well- 

 marked plates, like a and /, figure 2, have a transverse thicken- 

 ing which raises the plate surface nearly to the level of the 

 median fold and gives the latter two widened moundlike areas 

 on each plate. The species differs from C. r e g i u s Bill, in 

 the absence of the much narrower, higher and sharply defined 

 median folds of that species. The larger cylindrical pores, 0.15 

 mm in diameter, are situated one on each side of a median 

 fold where the latter crosses a suture. These pores are 0.4 mm 

 from center to center. On either side of these are one or 

 more smaller pores with their centers about 0.2 mm apart. 



