44 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I45 



Table 4. — Characters distinguishing Mellita from Leodia 



Mellita 



Four ambulacral lunules 



*Posterior lunule extending far ante- 

 riorly between posterior petals 



*Paired interambulacra separated from 

 basicoronal row by one pair of 

 ambulacral plates 



*Periproct partly within basicoronal 

 interambulacral plate 



*First pair of post-basicoronal plates 

 in paired interambulacra elongate 



*Lunules formed by closing of mar- 

 ginal notches 



Leodia 



*Five ambulacral lunules 



Posterior lunule not extending far an- 

 teriorly between posterior petals 



Paired interambulacra separated from 

 basicoronal row by two pairs of 

 ambulacral plates 



Periproct outside basicoronal plate 



First pair of postbasicoronal plates in 



paired interambulacra short 

 Lunules formed by resorption of test 



The characters marked with an asterisk occur in Mellita aclinensis. 



38 



39 



41 



Figs. 38-41. — Mellita aclinensis Kier, new species: Growth series showing 

 development of lunules: 38, U.S.N.M. 648189; 39, U.S.N.M. 648190; 40, 

 U.S.N.M. 648191; 41, U.S.N.M. 648136. From the Tamiami formation, loc. 27, 

 all X H. 



