26 LINXARSSOX. BRACHIOPODA OF THE PARADOXIDES BEDS. 



shell; Cardinal angles rounded. Surface marked with retiform 

 eminences, including small excavations. The eminences often 

 swell out and become higher at the crossing-points, thereby 

 giving to the surface a somewhat grauulated appearance (as in 

 flg. 43). In some specimens there are also more or less di- 

 stinct radiating ridges, especially near the median line of the 

 shell. The shell substance is apparently corneous, but I have 

 not been able to discern more than one layer. The colour in 

 the specimens from Bornholm is black, in those from Westro- 

 gothia more brown. — Ventral valve convex, subconical. Beak 

 erect and pointed, pierced by a minute, round foramen. The 

 posterior, visible only in one specimen, is truncated, so as to 

 form a false area, which has in the middle a triangulär fissure, 

 arched över, in the upper part only, by a convex pseudodel- 

 tidium. — Dorsal valve less convex, somewhat flattened along 

 the middle ; greatest height at the beak, which is not, however, 

 so prominent as in the opposite valve. Hinge-area not visible 

 in an}^ of the specimens. — Interiör of both valves unknown. 

 Two specimens measured: 



Length o mm. Breadth 4 mm. 

 » 2 )^ )> 3 y> 



There are so many analogies between this species and the 

 Iphidea bella Bill. (Pal. Foss., vol. II, pt. I, p. 76) that I think 

 it scarcely dubious that they belong to one and the same genus, 

 though the internal characters of neither are known. The Swe- 

 dish species differs by having the false area narrower and oc- 

 cupying only the upper part of the triangulär fissifre. The 

 sculpture of the shell surface is also difterent, and the size 

 many times smaller. To Orthisina this genus has certain ana- 

 logies, but I think that they are only superticial. It seems 

 to be well distinguished by the nature of the shell substance. 

 Probably it is most nearly allied to Kutorgina. 



Iphidea ornatella occurs in the strata with Paradoxides 

 Forchhammeri. In Westrogothia I have found a few specimens 

 at Lovened. From Bornholm several specimens have been sent 

 by Professor Johxstelt. 



As \vill be seen from the above descriptions, the Bra- 

 chiopod fauna of the Swedish Paradoxides beds is well deve- 



