133 



l886. Monticulipora parasitica Stuckenberg : Materialien z. Kenn. d!_- 

 Fauna d. Devonischen Ablagerungen Sibiriens, p. 14, pi. 11.^ 

 fig. 17. 



" Die Art bildet sehr diinne krustenformige Ueberzuge auf fremden Kor- 

 pern. Die kurz prismatischen, unregelmassig polygonalen, zuweilen gerun- 

 deten, diinnwandigen Zellen sind von ungleicher Grosse und erreichen im 

 Maximum etwa 1/2 mm. Weite. An den Punkten, wo mehrere grossere 

 Zellen zusammenstossen, liegen haufig andere sehr viel kleinere. Im Uebri- 

 gen zeigt sich keinerlei Regelmassigkeit in der Verteilung der Zellen ver- 

 schiedener Grosse. Die Oberflache des Stockes ist ganz glatt." 



We have a specimen probably identical with this species ; it forms a very 

 thin crust upon a shell of Spirifci- vcrnaiili, and is composed of prismatic 

 cells, which are usually four^ — six-sided, and 0.24 mm. in average diameter. 

 The cells are surrounded by their own walls ; the apparently simple wall 

 being in reality duplicate in structure : this indicates that the fossil does not 

 belong to the genus Clinctctes, but to Monticuliporidae. 



Locality : — From the vicinity of Ling-ling, Yung-chou-fu, prov. Hu-nan. 



Geological Age : — Upper Devonian, Kayser found it in the Middle De- 

 vonian of Ta-kwan, prov. Yun-nan, and Stuckenberg in a Devonian limestone 

 on the river Bega in the Minussinsk province, Siberia. 



Pteropoda. 

 Tentaculitidae. 



Tentaculites, Walcott. 



Tentaeulites sp. pi. 



PI. XVIIL, Fig. I. 

 The figure shows the weathered surface of a small slab of a platy marly 

 limestone, with numerous minute tubular bodies, some 3 mm. in length. By 

 the application of a magnifier, they are found to represent one or possibly two: 



i) A. Nicholson: Palaeozoic Corals, JMonticiilitom, p. 80. 1881 . , ^ , , 



I 



