Researches in Fossil Zoology. 549 



of the lower division of the muschelkalk, near Durlach, in the 

 Grand Duchy of Baden, where it lies immediately upon the 

 variegated sandstone, [bunter sandstein]. The muschelkalk 

 has produced only this single species of the Macroura ; but 

 this formation likewise encloses Crustacea of the division of 

 the Entomostraca, viz., the genus Limulus, of which Count 

 Munster found a species, Lim. prisons, near Baireuth, and I 

 examined another species in the dolomitic muschelkalk near 

 Kottweil, which I intend to make known under the name of 

 Lim. agnotus. These petrifactions are great rarities. 



I am convinced, by the collections at Strasbourg, that 

 the Macroura are older than the muschelkalk. I found in 

 them crabs from the variegated sandstone of Souly-les-Bains, 

 among which, one has some similarity to Galathea, and the 

 other to Gebia ; to these I shall give the names of Galathea 

 audax and Gebia obscura. My Erion Hackmanni from the 

 environs of Goppingen, a splendid specimen of which I have 

 described in 'Act. Acad. Cur. Leop. Carol. Nat. Cur.' xviii. 

 p. 263, tt. 11, 12, more usually occurs in lias; it has been 

 found in the lias of Banz and the Ahorn valley, (Maple val- 

 ley), near Rabenstein, and it is said to exist in the lias of 

 Lyme Regis. The genus Erion is oftener embedded in Sol- 

 lenhofer slate, but then it appears in other forms. Besides 

 those already known, I have described a new species under 

 the name of Er. Schuberti, and have further ascertained the 

 existence of another, which is of a much larger size than Er. 

 Hackmanni, and this I have named Er. Rhemani. 



In the different structures of the Jura formation, or the 

 oolitic range, a certain genus of Macroura, viz., my genus 

 Glyphea, presents an extraordinary appearance. It is rich 

 in species. The lias of Suabia has only two, viz., Glyphea 

 grandis, the largest known to me, and a smaller species. — 

 The others, arranged by me, are Gly. Reglegani, ventrosa, 

 and Munsteria, from the ground at Chailles, in the depart- 

 ment of the Haute-Saone, in France. Glyphea Dressieri from 

 the ground at Chailles, near Besan§on, and from the coral 

 reef near Derneberg, [Hanover]. Glyphea pustulosa from 

 the Bradford clay near Buxweiler, and the coral reef near 

 Heldersheim ; and Glyphea Mandelslohi, from the Oxford 

 clay, from Ravenstein, Thurnan, and Mossingen. 



I have also discovered another genus of fossil crabs, but 

 have not yet been able to ascertain if it belongs to the Ma- 

 croura or to the Brachyura. I have named it Prosophon, and 

 am acquainted with three species ; one, the Pro. simplex, is 

 embedded in the Scyphian limestone belonging to the lower 

 coral reef near Streitberg ; the second species, Pro. helies, is 



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