LECANOCRINIDAE 143 



IBB short, visible in side view. BB and RR of about equal height, and RA 

 of ordinary proportionate size. Anal x elongate, obtusely angular above, and 

 rising but little above the radials. Superior parts and column unknown. 



M. Oehlert states the diameter at top of radials as ranging from 12 to 16 mm. The 

 specimen which he figures as natural size is about 6 by 9 mm., and the enlargement of the 

 others is not stated. None of his figures show the correct form of the anal plate. I have 

 therefore made the description from three specimens in my own collection, in connection with 

 his figure 2. The surface ornament, which is coarser than on any other species, is well 

 shown in one of them (PL III, fig. 29), and the anal plate in another (fig. 280). Oehlert's 

 figure 2/ is incorrect in representing a brachial directly over the anal plate. According to his 

 figure the primibrach is very short, which would indicate a rapidly tapering crown. 



The species is well distinguished from all others by its coarse ornament, and from the 

 only other known Devonian species by its more elongate form and greater size of the 

 infrabasals. 



Types. In the Musee d'Histoire Naturelle, Laval, Mayenne, France. The other speci- 

 mens figured herein, Plate III, figures 28, 29, are in the author's collection. 



Horizon and locality. Lower Devonian; Sable, France. 



Lecanocrinus magnaradialis (Weller) 

 Plate III, figs. 26a-c 



Ichthyocrinus magnaradialis Weller, Geol. Surv. New Jersey, Pal., Ill, 1903, p. 299, pi. 33, fig. 5. 



A small species. Calyx obconical, with large truncate base; sides some- 

 what curving; height to width at top of RR, i to 1.8. Surface destroyed by 

 erosion. Height and width at RR, 6 mm. by 1 1 mm. 



IBB small. BB and RR large. B to R to IBr, 3 : 5 : 4.2. RA large, obliquely 

 under right posterior radial, but almost touching right anterior radial. IBr 1 

 and 2, giving rise to broad, flat rays, of which only two IIBr are in one place 

 preserved. Other parts unknown. 



Dr. Weller described this species from a single badly weathered and rusty specimen. 

 The surface is so much eroded that it is difficult to trace all suture lines with certainty, but 

 the structure shown by the figures is substantially correct. The fact that it is from an Amer- 

 ican Devonian horizon gives to this species especial interest, and it is to be regretted that our 

 knowledge of it is limited to what we can gain from a single imperfect- specimen. The shape 

 and size of the radianal suggests a possible affinity with Clidochirus, but its position is that of 

 Lecanocrinus to which the specimen otherwise conforms. It is of the general type of 

 L. soyei from the Lower Devonian of France. 



Weller in describing the species noted its resemblance to Lecanocrinus, but was deterred 

 from so referring it because he could not detect the anal and radianal plates ; but after con- 

 siderable experience in deciphering obscure fossils of this group I have been able to identify 

 them satisfactorily. 



Type. University of Chicago. 



Horizon and locality. Lower Devonian, from cherty layers equivalent to the New Scot- 

 land beds of New York ; near Pass Ridge, New Jersey. 



