30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I45 



from the Miocene or Pliocene of the Dominican Republic, but evi- 

 dently this age determination is based only on the fact that the same 

 species occurs in the Caloosahatchee. 



Occurrence. — Post-Caloosahatchee, pre-Fort Thompson loc. 1. 

 Caloosahatchee formation loc. 2, 3, 6. 



Cooke (1959, p. 34) suggested that all the Florida specimens of 

 this species came from the Pleistocene Fort Thompson formation. 

 However, neither DuBar nor Wilson and I have ever collected any 

 specimens of C. rosaceus dalli from the Fort Thompson. Wilson 

 and I have collected several specimens of this subspecies in place in 

 the Caloosahatchee formation (DuBar's Bee Branch member). 



Types.— Holotype, U.S.N.M. 164670 ; figured specimens, U.S.N.M. 

 648163-6. 



CLYPEASTER CRASSUS Kier, new species 



Plate 11, figs. 1-3; text figure 24; table 1 



Clypeaster subdepressus Cooke, 1942 (not Gray), Journ. Paleont., vol. 16, p. 11; 



pi. 4, fig. 5. 

 Clypeaster subdepressus Cooke (not Gray), 1959, U.S. Geol. Surv. Prof. Paper 



321, p. 36, pi. 11, figs. 2-4. 



Diagnosis. — Species characterized by thick margin and marginally 

 indented interambulacra. 



Material. — Three specimens from Florida; 10 from South Caro- 

 lina, three well preserved. 



Shape. — Smallest specimen 91 mm long, largest 126; average width 

 90 percent of length, average height 19 percent ; test pentagonal with 

 truncated posterior margin, pointed anterior with greatest width an- 

 terior to center ; strong indentations in interambulacra 4, 5, 1 ; mar- 

 gin thick, 10 percent of length, area between margin and ends of 

 petals flat or slightly depressed ; petaloid area inflated ; adoral surface 

 flat. 



Apical system. — Slightly posterior to center, five genital pores, 

 small ocular plates, madreporite star-shaped. 



Ambulacra. — Petals broad, short, extending three-fifths distance 

 from apical system to margin; anterior petal (III) slightly longer 

 than others (see table 1), anterior paired petals (II, IV) shortest, 

 posterior paired petals (V, I) intermediate; interporiferous zone 

 approximately twice width poriferous zone; approximately 60 pore- 

 pairs in each poriferous zone (see table 1). 



Periproct. — Inf ramarginal, located near posterior margin ; on holo- 

 type (91 mm long) opening 5.5 mm from margin, opening irregular 

 in outline, elongated transversely. 



