LOCALITIES. 263 



336 [F. Schmidt, personal communication, 1906]. (For stratigrapUc position and association, see p. 143.) Ordo- 

 vician: Echinosphxrites limestone, horizon Cla, at Popowka, near St. Petersburg, Russia. 

 *Acrotreta subconica. 



336a (references follow species) . (For stratigraphic position and association, see p. 143.) Upper Cambrian: 06oto 

 sandstone at Podolova (Putalova?), on Ijora (Ischora) River, Government of St. Petersburg, Russia. 

 Obolus apollinis [Eichwald, 1860, p. 926]. 

 Obolus apollinis ingricus [Eichwald, 1860, p. 926]. 

 Keyserlingia buchi [Eichwald, 1860, p. 914]. 



3361) [Eichwald, 1860, p. 925]. (For stratigraphic position and association, see p. 143.) Upper Cambrian: Obolus 

 sandstones on Odensholm Island, about 55 miles (88.6 km.) west of Reval, Government of Esthonia, Russia. 

 Obolus apollinis. 



336c [Eichwald, 1860, p. 926]. (For stratigraphic position and association, see p. 143.) Upper Cambrian: Obolus 

 sandstone at Reval, Government of Esthonia, Russia. 

 Obolus apollinis. 

 Obolus apollinis ingricus. 



336d [Eichwald, 1860, p. 929]. (For stratigraphic position and association, see p. 143.) Passage beds between the 

 Upper Cambrian and the Ordovician: Orthoceratite limestone at Reval, Government of Esthonia, Russia. 

 Obolus (Acritis) antiquissimus. 



336e (references follow species). (For stratigraphic position and association, see p. 143.) Passage beds between 

 the Upper Cambrian and the Ordovician: Orthoceratite limestone, at Pulkowa, near St. Petersburg, Russia. 

 Obolus (Acritis) antiquissimus [Eichwald, 1860, p. 929]. 

 Siphonotreta unguiculata [Eichwald, 1860, p. 916]. 

 Siphonotreta verrucosa [Eichwald, 1860, p. 916]. 



336f [Eichwald, 1860, p. 927]. (For stratigraphic position and association, see p. 143.) Passage beds between the 

 Upper Cambrian and the Ordovician: In the pyroxene-bearing sands in the Orthoceratite limestone beds 

 at Reval, Government of Esthonia, Russia. 

 Obolus (Mickwitzella) siluricus. 



336g (references follow species). (For stratigraphic position and association, see p. 143.) Ordovician: Limestone 

 in the vicinity of Zarskoe Selo, Government of St. Petersburg, Russia. 



*Volborthia recurva [Kutorga, 1848, p. 278]. ] „, . ^ , r ^i , , 



„. , ^ ^ ■ -I _, r-S- \ nn.o o^r-n f Thcse specics may uot bc from the Same bed. 



Siphonotreta unguiculata [Kutorga, 1848, p. 265]. J 



336h [U. S. National Museum]. (For stratigraphic positionand association, see p. 143.) Upper Cambrian: Ungulite 

 grit at Baltischport, Esthonia, Russia. 

 *Schizambon? esthonia. 



3361 [Mickwitz, 1896, p. 147]. (For stratigraphic position and association, see p. 144.) Upper Cambrian: Sand- 

 stone below the Obolus conglomerate proper at Reval, Government of Esthonia, Russia. 

 Obolus triangularis. 



336j [U. S. National Museum]. (For stratigraphic position and association, see p. 143.) Upper Cambrian: Obolus 

 sandstone at Staroja Ladoga, Government of Novgorod, Russia. 

 Obolus apollinis maximus. 



336k [Eichwald, 1860, p. 925]. (For stratigraphic position and association, see p. 143.) Upper Cambrian: Obolus 

 sandstone on the bank of Volkhof (Wolchow) River, east of St. Petersburg, Russia. 

 Obolus apollinis. 



3361 [Eichwald, 1860, p. 925]. (For stratigraphic position and association, see p. 143.) Upper Cambrian: Obolus 

 sandstone on the bank of Sjass (Sias) River, near Lake Ladoga, Government of St. Petersburg, Russia. 

 Obolus apollinis. 



336m [Eichwald, 1860, p. 925]. (For stratigraphic position and association, seep. 143.) Upper Cambrian: Obolus 

 sandstone at Baltischport, about 30 miles (48 km.) west of Reval, Government of Esthonia, Russia. 

 Obolus apollinis. 



336n [de Verneuil, 1845, p. 289]. (For stratigraphic position and association, see p. 143.) Upper Cambrian: On 

 Ijora (Ischora) River, Government of St. Petersburg, Russia. 

 *Keyserliiigia buchi. 



3360 [U. S. National Museum]. (For stratigraphic position and association, see p. 143.) Upper Cambrian: Ungu- 

 lite grit, Koporje, Government of St. Petersburg, Russia. 

 Obolus (Schmidtia) celatus. 

 Helmersenia ladogensis. 

 Keyserlingia buchi. 



