58 GEOLOGICAL MEMOIRS. 



On the Organic Remains from Arzo near Men'DRISTO. 

 By P. Merian. 



[Basel. Verhandlimg, 18-46-8, viii. pp. 31-33, andLeonhard u. Bronn's Jahrbuch 

 f. Mineral. 1849, p. 866.] 



Carl Brunner and Bud. Merian liave collected from the red and 

 white marble- like limestone of Arzo the following fossils, as determined 

 by the author of the communication. Lima, small, and yerv similar 

 to L. Hermanni, Yoltz ; Pecten, internal cast, closely agreeing with 

 P. textorius, Miiust. ; Terehratula, very near to T. ornithocephala. 

 Sow., plentifid ; Terehratula, agreeing with T. tetraedra, Sow. and 

 T. quimiuecostata, Ziet. ; and Sjpirifer rostratus, Y. Buch, and 5/j. 

 tv.midus, Y. Buch, which moreover appear to pass into one another. 

 All of these species distmctly point to the lower part of the has. 



In a grey marlstone at Tremona near Arzo occur TerehratuJcB, of 

 perhaps the above species; Belemnites, Pecten, Pentacrinus, and a 

 small midescribed Sponge. This must, therefore, necessaiily be lias. 



From Monte Generoso, Brunner obtained the followhig has fossils : 

 Terehratula ? tetraedra, Sow,, Sjnrifer rostratus, Y. Buch, Sp. tu- 

 midus, Y. Buch, and Sji. Walcotii, Sow. [T. R. J.] 



On the Geosaurus maximus. By Th. Plieninger. 



[Wiirtemb. Jaliresb. 1849, v. 252-253, and Leonhard u. Bronn's Jahrbuch f. 

 Mineral. 1850, p. 128.] 



A BLOCK of the so-called Ulmer Portland-oohte contained a fragment 

 of a lower jaw from near the symphysis, with seven large conical 

 teeth. These were hollow for two-thirds of their height ; open at 

 the base ; with a two-edged point ; and bent inward and backward. 

 The author had described them under the name of Geosaurus maxi- 

 mus in the Jahresb. ii. 150. 



As however the teeth are evidently fixed in alveoh, this animal 

 belonss to the Thecodont Saurians, and perhaps ought to be united 

 to Bdodon. [T. R. J.] 



On the Archegosaurus of the Coal Formation. 

 By H. V. Meyer. 



[Dunker u. Meyer's Palaontosraph. i. 209-215, pi. 33. fig. 13-17. Comp. Leon- 

 hard u. Bronn's Jahrbuch I :\Iiner. 1848, p. 468, and Jahrb. 1850, p. 104.] 



The author describes a new mdi^idual oi Archegosaurus minor, con- 

 sisting of a skull and part of the neck, in H. Schnm*'s collection at 

 Treves. He refers also to his discourse at the Meeting of Natural 

 Philosophers at ALs-la-Chapelle, in 184", where he first saw the spe- 

 cimen. On both occasions he has combated Goldfuss' opinion, that 

 it was referable to a crocodile ; he has moreover proved its labyrin- 

 thodontoid character, and induced Goldfuss to alter his fii'st opinion on 

 the subject. He proceeds to cite the notice of Goldfuss' work in the 



