Description of the Fossils in the older Deposits of the Rhenish Provinces. 339 



thors describe the G. retrorsus as altogether enveloped, while the drawing of the former exhibits a de- 

 cided umbilicus, and Beyrich's figure does not show well the form of that part of the shell. The three 

 varieties which we have distinguished are all more or less umbilicated. 

 Oberscheld, Marten berg near Stadtberg, Adorf ; common. 



7. Goniatites simplex^ de Buch, Ann. des Sc. Nat., t. 29, PI. II. f. 8. 



In the ferruginous limestones of Oberscheld is found a shell which nearly resembles that figured by 

 de Buch under this name, and which comes from Rammelsberg near Goslar (Hartz). 



8. Goniatites paucistriatus, nob. Tab. nost. XXV. f. 8, 8 a, 8 b. 



Shell flattish, umbilicated. Volutions regularly rounded, almost completely enveloping and only show- 

 ing in the umbilicus the inner edge of each volution. Back wide, limited by two decurrent, linear, 

 shallow channels. Volutions ornamented with from fifteen to eighteen simple, elevated, very fine 

 striae, which, setting off from the suture, go sometimes straight over two-thirds of the side and some- 

 times turn a little forward, then backward and then forward again into the channel, where they form 

 a narrow and deep sinus. They are then recurved again to pass over the back where they form a 

 second sinus wider, more rounded and not so deep as the preceding. Lobes of the septa unknown. 

 We have placed this species near to G. retrorsus, because it bears some resemblance to it in general 

 form, but it is easily distinguished by the disposition of the striae and by their small number. At first 

 sight these striae might be mistaken for the lobes of the septa, but it is easy to ascertain that they only 

 exist upon specimens in which the shell itself remains. We had already observed upon several species 

 from the mountain limestone of Vise (Belgium) zigzag striae which we might have confounded with the 

 septa, if we had not observed that they do not present any dorsal lobe, and that beneath the shell are 

 found the true lobes of the septa, which are much more simple than the external striae, and have no re- 

 semblance to the pattern formed by these latter. 

 Adorf, Oberscheld ; common. 



II. Lobes angular or tongue-shaped. 

 A. Volutions completely enveloped. 



9. Goniatites cancellatus, nob. Tab. nost., XXV. f. 6, 6 a, 6 b. 



Shell globular, with rounded, inflated volutions, the last completely enveloping all the others ; umbilicus 

 none, its corresponding place being occupied by a slight depression of the inner edge. Back sim- 

 ple, rounded, coalescing with the sides by a continuous curve. From the central depression radiate 

 numerous striae, which are very fine, at unequal distances, and often bifurcated. They are first di- 

 rected forward near to the middle of the side, and then turn backward to form a broad and shallow 

 sinus whose concavity is turned forward. At about two thirds of the side, where the inflection of 

 these striae commences, other striae, more delicate, but still regular and transverse, cross them ob- 

 liquely forming a slight undulation, thus producing an elegant chequer- work over the entire dorsal 

 region of the shell. 



The form of this species, of which we have not observed the septa, approaches to that of G. linearis 

 of Munster, which has only a single angular funnel-shaped lateral lobe. 



From the iron mines of Brilon ; very rare. 



B. Volutions exposed ; three lateral lobes. 



10. Goniatites Hceninghausii, de Buch, loc. cit. supra, PI. II. f. 3. Bronn. Leth. geog., PI. I. f. 1. Tab. 

 nost. XXV. f. 7, 7 a, 7 6. 



