18 G. HOLM AND A. H. WE8TERGAAED 



greater resemblance to A. sibericum, to which it is here referred, though with some hesita- 

 tion. In the relative width of axis and lateral lobes it agrees with the latter, and even if 

 the number of segments of which it is composed seems to be one less than in the form from 

 Bennett Island, this difference alone will be of no specific value. The striae of the marginal 

 limb are less distinct, which may be due to the fact that the specimen exhibits the internal 

 surface of the test. From Bathyuriscus howelli, as described and figured by Walcott (1916, 

 p. 343), it is distinguished by greater width, a narrower and more conical axis, and more 

 faintly marked and less strongly curved pleural furrows. 



Another pygidium found in the Lena limestone above Yakutsk was also referred by 

 Schmidt to A. excavatum. I have had the opportunity of examining this specimen and, as 

 far as I can see, it is not identical with any one of the Anomoca/re forms under considera- 

 tion. The pleural furrows are angulate, transverse in the interior part of the lateral lobes 

 and directed outwards-backwards in the marginal limb. Striae are absent. 



Anomocwre (?) sp. indet 

 [PI. m, tig. 3—12] 



Apart from the species described above, two or more representatives of the genus 

 Anomoca/re, or of related genera, seem to be present. However only fragments of young 

 individuals have been found, which are too poorly preserved to show distinct specific 

 characteristics. 



A couple of small and fragmentary cranidia (fig. 3 — 8) present some resemblance to 

 the geno-type A. laeve (pi. IV, fig. 16 — 18). "Whether they all belong to one species is 

 doubtful, nor can it now be stated whether they belong to the same species as the pygidia 

 mentioned below. 



A pygidium (fig. 9) is suggestive of A. excavatum, but differs from it — also from very 

 young specimens — in having the pleural furrows curved more strongly backwards. 



Three pygidia (fig. 10 — 12) are distinguished from the last mentioned tail by having 

 a longer and narrower axis. They differ from A. sibericum in the strongly curved pleurae. 



Genus Solenopleura Angelin 



s Solenopleura (?) sp. 



[PI. Ill, fig. 19] 



■ A cast of a fi-ee cheek of young individual is suggestive of the cheeks of Solenoplewra, 

 for instance S. holometopa (Ang.). In fact, the resemblance seems to be enough to suggest 

 its belonging to a species of that genus. It is true that the tuberculated surface characterizing 

 Solenopleura is not discernible in the cheek in question, but this may be an apparent 

 difference due to its poor state of preservation and to the youth of the specimen. 



Genus Agraulos Coeda 

 A. difformis (Angelin) (?), A. acuminatus (Angelin) (?) 



[PL m, fig. 17—18] 



A free cheek of a very young individual recalls A. difformis (Ang.) In adult 

 specimens the marginal rim is wider and the space between the eye and the rim narrower 



