40 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



Periproct. — Marginal to slightly inframarginal, longitudinal, oval, 

 higher than wide, slight groove extending adorally. 



Peristome. — Anterior, depressed, pentagonal, width equal to height. 



Floscelle. — Bourrelets well developed, inflated, sides oblique ; phyl- 

 lodes (text fig. 20) long, slightly broadened, double pored; in small 

 specimens pore pairs in two series in each half -ambulacrum, approxi- 

 mately 10 pore pairs in each outer series, 4 or 5 in each inner ; in 

 large specimens, pore pairs in three series ; no buccal pores. 



Tuberculation. — Adorally tubercles slightly larger than adapically. 



Occurrence. — Upper Jurassic (Callovian), Gebel Oum Chabba, 

 Egypt. 



Location of type specimen. — Geological Museum, Cairo, Egypt. 



Remarks. — I have studied the holotype and two paratypes of 

 Fourtau's (1924, p. 27) Pygiiropsis lorioli (borrowed from the 

 Geological Museum, Cairo), and after cleaning the holotype I am 

 convinced that this species is certainly congeneric with Bothryo- 

 pneustes lamherti, and probably conspecific. Fourtau considered this 

 species to be a Pyguropsis because its periproct is marginal to infra- 

 marginal, and created his new genus Bothryopneustes for B. lamberti 

 because he had the mistaken impression that the periproct in the 

 latter species was supramarginal. Actually the periproct in B. lam- 

 herti and B. lorioli is in the same position — marginal to inframarginal. 

 The holotype of B. lorioli differs from the holotype of B. lamherti 

 only in appearing to have its outer petaloid pores more slitlike. This 

 difiference is not real but reflects the difference in the preservation of 

 the two specimens : the holotype of B. lamherti is badly weathered 

 with the outer pores greatly enlarged. The phyllodes, which are 

 visible in two of the paratypes of B. lorioli have three series of pore 

 pairs in each half -ambulacrum, whereas only two occur in the types 

 of B. lamherti. This difference is probably due to the difference in 

 the size of the specimen. The largest specimen that Fourtau referred 

 to B. lamherti, in which the phyllodes were visible, is 24.5 mm. long, 

 and the smallest that he referred to B. lorioli is 30 mm. It is to be 

 expected that the phyllodes in the larger specimen would have more 

 pore pairs. Two of Fourtau's paratypes of B. lorioli have thicker 

 tests with steeper sides than the holotype of the same species, and 

 evidently are similar to the specimens that Lambert (1932, p. 184) 

 saw when he distinguished B. lorioli from B. lamherti on the grounds 

 that the test in B. lorioli is thicker. This difference in thickness of 

 test may be a variable feature within the species, or these paratypes 

 may represent a separate species. Photographs of the holotype of 



