1920] Kew: Cretaceous and Cenozoic Echinoidea 131 



DENDEASTER (CALASTER) INTERLINEATUS (Stimpson) 

 Plate 35, figures la, lb 



Scutella interlineata Stimpson. Pae. R. R. Rept., vol. 5, 1856, pp. 153, 154, 

 pi. 4, fig. 30. 



Scutella interlineata. Remond, Proe. Calif. Acad. Sci., vol. 3, 1863-67, 

 pp. 14, 15. 



Scutella interlineata. (Blake) Meek, Smithson. Misc. Coll., vol. 7, 1864, 

 no. 183, p. 2. 



Scutella interlineata. Gabb, Gaol. Surv. Calif., Pal., vol. 2, 1869, p. 110. 

 Scutella interlineata. Cooper, Cat. Calif. Fossils, Seventh Rept. Calif. 



State Mineralogist, 1888, p. 271. 

 Scutella interlineata. Merriam, Univ. Calif. Bull. Dept. Geol., vol. 2, 1898, 



pp. 110, 111, 113, 117 (mentioned in text). 

 Not Scutella interlineata. Merriam, Proe. Calif. Acad. Sci., ser. 3, Geol., 



vol. 1, 1899, pp. 168-169, pi. 22, fig. 6. 

 Bendraster (?) interlineatus. Stefanini, Boll. Soc. geol. ital., vol. 30, 1911, 



p. 706. 



Not Bendraster interlineatus. Clark and Twitchell, U. S. Geol. Surv. Mon., 

 vol. 54, 1915, pp. 216-217, pi. 100, figs. 2a, 2b. 



Neotype.— 'No. 11353 Univ. Calif. Coll. Invert. Pal. 



Size of test very large. Measurements of specimen no. 11353 : 

 anteroposterior diameter 99.5 mm., transverse diameter 97.7 mm., 

 greatest height 12.8 mm. Marginal outline subcircular ; upper sur- 

 face greatly depressed and regularly arched to the summit, which 

 is anterior to the apical system. Apical system slightly eccentric to 

 the posterior. Apical star symmetrical. Ambulacral areas broaden 

 rapidly from the ends of the petals to the edge of the test, being wider 

 here than the interambulacra ; dorsal portions of the ambulacra peta- 

 loid. Petals symmetrical, large, and elliptical in outline ; extend 

 slightly more than three-fourths the distance from the apical system 

 to the margin. Rows of pores of lateral petals almost closing at their 

 extremities ; poriferous areas wide, each being nearly as broad as the 

 interporiferous area ; the interporiferous area of the petals of the 

 bivium usually slightly narrower than that in the anterior lateral 

 ones. Odd anterior petal different, being wide open at its extremity, 

 slightly broader, and with narrower poriferous areas and wider inter- 

 poriferous area. Poriferous areas of all the petals usually somewhat 

 depressed below the surface of the test; pores conjugate. Inferior 

 surface flat, having well marked ambulacral furrows consisting of 

 straight, deep grooves, which continue from the peristome to the 

 margin, with less distinct branches near the peristome. Peristome 

 central. Periproct small, round, and supramarginal, being placed 



