A MIDDLE CAMBEIAN FAUNA FROM BENNETT ISLAND 



13 



' This species seems to be rather common. The specimens referred to it are somewhat 

 varied, as shown by the figures, but probably they belong to one species only. Whether 

 the small pygidia in fig. 24 and 25 also belong here is more doubtful; the latter seems 

 to have a longitudinal farrow behind the axis. 



Though a fair number of pygidia are present, no cephalon has been found that can be 

 referred to the species with any degree of probability. The specimen in fig. 44, probably 

 a cephalon, does not seem to belong here in view of its narrow glabella. Possibly the 

 cephalon closely resembles that of A. glcmdiformis or of A. nudus Jiyperhoreus and a confusion 

 with one of the latter may be imaginable. 



A. latirhacMs recalls A. hrevifrons Ang. to some extent, but differs from it in its wider 

 and longer axis. 



Agnostus mcticus n. sp. 



[PL I, fig. 26— 30(31?)] 



Two (or three?) cephala and seven pygidia, most of them very fragmentary, present 

 a great resemblance to A. Jcjerulfi Broggee. In fact, the agreement is sufficient to indicate 

 vicarious forms. Thanks to the courtesy of Professor Kiaer of Oslo, who has sent me Brog- 

 ger's type specimens of the latter species, I am able here to give photographic figures of 

 them (pi. IV, fig. 13, 14) for the sake of comparison. . 



The cephalon of the Siberian form differs from that of the Scandinavian in having 

 a slightly tapering (not parallel-sided) glabella, somewhat smaller and more widely sep- 

 arated basal lobes and the preglabellar field along the middle line almost as wide as the 

 cheeks. In both forms the posterior lobe of the glabella has slightly impressed sides and is 

 raised into a short, very faint keel. The pygidium presents a slight difference in regard 

 to the median ridge of the axis, which in A. kjeriilfi reaches only a short distance behind 

 the middle ring, in A. mxticus almost to the posterior margin of the axis, and, consequently, 

 the up-turned terminal part of the end-lobe is much shorter in the latter than in the former. 



It is doubtful whether the cephalon of fig. 31 belongs to A. arcticus. The glabella 

 seems to lack the elongated median tubercle and to have its greatest elevation not in the 

 middle of the posterior lobe, but just in front of the posterior border. It appears to agree 

 fairly well also with A. quadratus Tullbeeg. 



A. kjerulfi is known from the zone of Paradoxides forchJiammeri in Norway and 

 Sweden (Scania, Angermanland).^ Rare. 



Agnostus repandus n. sp. 



[PI. I, fig. 35—39, (40—43 ?); pi. IV, fig. 11, 12] 



A couple of cephala and two pygidia probably belong or are at least very closely 

 related to a Swedish species hitherto undescribed, which I will denominate A. repandus 



1 By Gronwall (1902, p. 69) A. kjerulfi is referred 

 from the P. davidis ione of Bornliolm. However, as 

 already pointed out by Gronwall, the Danish form differs 

 from the Norwegian one in having a narrower pygidiiim 

 with a longer axis, and moreover, so far is visible from 

 the figure, it has a median furrow separating the lateral 



lobes and is without the characteristic raised transverse 

 ridge behind the axis. Even if the relations of the said 

 forms are unmistakable the diil'ereuces are so distinct, 

 as far as I can see, that it can hardly be proper to bring 

 them together under one specific name. 



