218 CALIFORNIA ACADEMY OP SCIENCES. 



The author describes a new species of Astqjhus from the Upper Siluriau 

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

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

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

 Dalmanileti. 



Tschernyschew (Tli.) Die Fauna des mittleren uiid 

 oberen Devon am West-abhange des Urals. 



In Mem. du Comit«' Geo]., vol. 3, No. 3, 1887, p. 13. 



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

 Gohlius (Brontcns) (jrannlatus Goldf. Leperditia molleri Schm. Isochilina 

 bknsls Griin. 



Tullberg (S. A.) Om Agnostus-aYtGYna i de Kambriska 

 aflagringarne vid Aiidrarum. 



In Sveuska 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 usuallj- 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 front 

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

 groove. 



Agnostus atavus n.sp., A . (jibhuslAmca ., .4. /r'ssHsLundgr., .4. intcrmedius 

 n. sp., A . punctuonus Aug., A. clegans n.sp., A. hyhridus Briig., A.incertus 

 Brog., A. lundgreni n. sp., A. iialhor.iti Brog., A. exsculptus Aug., A. acu- 

 leatus Aug., A. reiicidatus Aug., A. trhectus Salt., A. pisiformis Linne, .4. 

 cyclopyge n. sp., A. pusilliis n. sp. 



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

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

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

 becomes broad. 



Agnostus cicer n. sp., A. nudus Beyr., also var. scnnicus n. var. and var. 

 marginatus Brog., A. glandtformift Aug., .4. Uvvigatus Dalm., ^4. 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 bj' a 

 central gi'oove, striated on the sides. Pygidium is usually provided with 

 lateral spines. 



(a) Regii: Agnostus re.gius 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. 



