218 CALIFORNIA ACADEMY OP SCIENCES. 



The author describes a new species of Asaphus from the Upper Silurian 

 of Perry County, Tennessee, as Asaphus megalophthalmus, p. 94, pi. 11, 

 figs. 1-5, and an undescribed trilobite, pi. 11, figs. 6-7. The first is a 

 Phacops approaching P. hudsoni Hall, the second a species of the genus 

 Dalmanites. 



Tschernyschew (Th.) Die Fauna des mittleren und 

 oberen Devon am West-abhange des Urals. 



In Mem. du Comite Geol., vol. 3, No. 3, 1887, p. 13. 



Dechenella romanovski n. sp., D. haldemani Hall., D. aff. verneuili Barr. 

 Goldius (Bronteus) granulatus Goldf. Leperditia molleri Schm. Isochilina 

 biensis Griin. 



Tullberg (S. A.) Oni Agnostus-sucierna, i de Kambriska 

 aflagringarne vid Aiidrarum. 



In Svenska Geol. Undersok., series C, No. 42, 1882, 2 pis. 



The author divides the Agnosti into four groups, as follows: 



Longifrontes: This section is distinguished by its strongly projecting 

 glabella and axis, which is usually moderately long. Crust smooth. The 

 cheeks grooved. The shell on both the cheeks and tail is provided with 

 elevated granulations. Limb is generally narrow. The cheeks in fro-ut 

 of the glabella, and side lobes of the tail behind the axis, are divided by a 

 groove. 



Agnostus atavus 11. sp., A.gibbusJ-iinrs., A. ^sswsLundgr., A. intermedius 

 n. sp., A . punctuosus Ang., A. elegans n.sp., A. hybridus Brog., A. incertus 

 Brog., A. lundgreni n. sp., A. nathorsti Brog., A. exsculptus Ang., A. acu- 

 leatus Ang., A. reticulatus Ang., A. trisectus Salt., A. pisiformis Linne, A. 

 cyclopycje n. sp., A. pusillus n. sp. 



2. Lrevigati: The dorsal groove outlining the glabella and axis of the 

 thorax are obsolete. Crust smooth and shining, sometimes with slight 

 indications of strife. Limb on the head disappearing; on the pygidium it 

 becomes broad. 



Agnostus deer n. sp., A. nudus Beyr., also var. scanicus 11. var. and var. 

 marginatus Brog., A. gland/formis Aug., A. Iceviyatus Dalm., A. bitubercu- 

 latus Ang. 



Limbati: General form subquadrate. Head has a broad limb. Basal 

 lobes are large. The cheeks in front of the glabella are divided by a 

 central groove, striated on the sides. Pygidium is usually provided with 

 lateral spines. 



(a) Kegii: Agnostus regius Sjogr., A. rex Barr. This subdivision is 

 distinguished by its broad limb diminishing cheeks on the head and side 

 lobes of the tail (especially by the front lobe of the glabella). 



(b) Fallaces: This series has a smaller head, moderately broad limb. 

 Cheeks large. Basal lobe rather large, also by the third joint of the tail 

 which is enlarged. 



