38 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



not widened (text fig. i6), very long, double pored, with many pore 

 pairs arranged in three series in each half-ambulacrum, outer two 

 series close to each other almost forming one series ; no buccal pores. 



Tuherculation. — Tubercles on adoral surface slightly larger than 

 on adapical. 



Occurrence. — Jurassic (Bathonian or Callovian) of British and 

 Italian Somaliland. 



Location of type specimen. — Hunterian Museum, University of 

 Glasgow, Scotland. 



Remarks. — Maccagno erected Dactyloclypcus as a new subgenus 

 of Clitopygus (herein considered a synonym of Nucleolites). How- 

 ever, in the type species of Clitopygus, Nucleolites lorioli (Cotteau), 

 and of Nucleolites, N. scutatus, the phyllodes are much shorter than 

 in C. wylliei with far fewer pore pairs, arranged in only two series, 

 and the petals are much narrower having narrower poriferous zones. 

 Maccagno distinguished C. wylliei from Clypeus because its periproct 

 is not adjacent to the apical system and because of the character of 

 its bourrelets. There are species of Clypeus, however, in which the 

 periproct is not in contact with the apical system, and the bourrelets 

 in C. wylliei are very similar to those in the type species of Clypeus, 

 C. plotii Leske. As originally done by Currie, C. wylliei should be 

 referred to Clypeus. 



Synonym of CLYPEUS 



Echinoclypeiis De Blainville, 1830. Diet. Sci. Nat. (Zoophytes), vol. 60, p. 189. 

 Type species herein designated, Galerites patella Lamarck, 1816 (=iClypeus 

 plotii Leske, 1778). 



De Blainville evidently had not seen Leske's paper, since all the 

 species he referred to Echinoclypeiis, Leske had also referred to 

 Clypeus. 



Genus BOTHRYOPNEUSTES Fourtau 



Bothryopneustes Fourtau, 1924. Cat. invertebres foss. I'figypte, terr. Jurassiques, 

 pt. I, Echinodermes, p. 27. Type species by subsequent designation, Currie, 

 1927, p. 425, Bothryopneustes lamherti Fourtau. 



Synonym : Clypeobrissus Currie. 



GENERIC DESCRIPTION 



Medium, circular to elongate, posterior margin often slightly 

 pointed, adapically moderately inflated, margins well rounded, ado- 

 rally usually pulvinate with ambulacra depressed ; apical system central 

 to slightly anterior, tetrabasal ; petals long, extending to margin, wide, 



