PACIITTEICHISMA.— TEOCHOBOLUS. 107 



Family VENTRICULITID^. 

 Genus PACHYTEICHISMA, Zittel, 1877. 



Pachyteichisma Caeteri, Zittel. 



1877. Pachyteichisma Carteri, Zittel, Studien, I Ab. p. 50 ; Neues Jahrbuch, p. 360, t. 3. 

 f. 3; id. 1878, p. 59; Handbuch der Pal. p. 176, f. 92. 



1808. An Alcyonite, Parkinson, Organic Remains, vol. 2, t. 11. f. 2. 

 1820. Spongus coarctatus ? Konig, Icones fossiles, p. 4, t. 7. f. 81. 



1878. Lancispongia lamellosa tumulosa, Quenst. Petref. Bd. 5, p. 92, t. 119. f. 1. 



Distribution. Upper Jura : Randen, Heuberg, Streitberg. 



Pachyteichisma lopas, Quenst. sp. 



1858. Spongites lopas, Quenst. Der Jura, p. 685, t. 83. f. 5. 



1877. Pachyteichisma lopas, Zitt, Studien, I Ab. p. 50; Neues Jahrbuch, p. 360. 



1878. Lancispongia lopas, Quenst. Petref. Bd. 5, p. 95, t. 119. f. 3. 



Distribution. Upper Jura : Heuberg, Wiirtemberg. 



Pachyteichisma, sp. 

 Portions of the spicular structure of an undetermined species from the Jurassic 

 formation at Hohenpolz, Bavaria {coll. Zittel). 



Genus TROCHOBOLUS, Zittel, 1877. 



Trochobolus crassicostus, Zitt. 



1877. Trochobolus crassicostus, Zitt. Studien, I Ab. p. 50; Neues Jahrbuch, p. 360, t. 3. 

 f. 4; idem, 1878, p. 60. 



1878. Scyphia barbata, Quenst. Petref. Bd. 5, p. 124, t. 120. f. 54. 



Distribution. Upper Jura: Randen, Streitberg [coll. Zitt.). 



Trochobolus lucernds, Konig, sp. 



1820. Spongus lucerna, Konig, Icones fossiles, p. 4, t. 7. f. 83. 

 1820. Spongus tuber, Konig, Icon. foss. p. 4, t. 7. f. 84. 

 1878. Mastospongia, sp., Quenst. Petref. Bd. 5, p. 148, t. 122. f. 7. 

 1878. Trochobolus, Zitt. Neues Jahrbuch, p. 61. 



I am doubtful whether this peculiar sponge is rightly included in the genus 

 Trochobolus, for though it agrees with the type of the genus in its mode of growth, 

 I am unable to determine whether the spicular nodes are compact or lantern-like. 

 The spicular structure in all the specimens is replaced by either calcite or iron 

 peroxide, and in sections of calcite specimens the spicular nodes appear to be 

 compact; but it is doubtful whether the octahedral nodes can be detected in all 



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