58 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



Figs. 30-35. — Apical systems in species of NucleoUtes showing the variation within a species 

 and between species: 30-32, NucleoUtes scuiahis Lamarck from the Upper Jurassic (Oxfordian) 

 at Villers, France : 30, Showing genital 2 not extending posteriorly between genitals i and 4 

 and no catenal plates, USNM 131280a; 31, showing genital 2 separating plates 4 and i, with no 

 catenal plates, U.SNM 19546a; 32, showing many catenal plates, USNM 195466. 33, Nnclcolites 

 orbicularis (Phillips) with many complementary plater., from Jurassic (Cornbrash) at Scar- 

 borough, Yorkshire, England, in Sedgwick Museum (J18148), Cambridge, England. 34, Nucleo- 

 Utes wo/or (Agassiz) fromToul, France, in the ficole National Superieure des Mines, Paris. 

 35, NucleoUtes hugi (Agassiz) from specimen in Museum National d'Histoire Naturelle, Paris, 

 no locality. All figures X 15- 



