ECIIINOID GENUS ECHINOCOIÎYS

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<strong>GENUS</strong> ECHINOCORYS IN THE SENONIAN OF BELGIUM 9 DESCRIPTIONS. Class Echinoidea d'Orbigny 1851. SUBCLASS ATELOSTOMATA POMEL 1869. Peristome deprived of jaws, or with only imperfect or temporary ones. ORDER NODOSTOMATA LAMBERT 1912. Peristome completely lacking jaws. SUBORDER SPATANGOIDEA AGASSIZ 1840. Test bilateral, peristome variable, often labiate but always without phyllodcs; plates of posterior interambulacrum developing a plastron on ventral surface; periproct without contact Avith the apex in the adult. Family ANANCHITIDAE A. Gras 1848. Apex elongate, plastron meridosterne; ambulacra not petaloid, or only subpel aloid. Subfamily Holasteridae Lambert 1917. Ambulacra composed of biporiferous plates. TRIBE ECHINOCORINAE LAMBERT 1917. Test ovoid; peristome reniform; homogeneous ambulacra; periproct marginal. infra <strong>GENUS</strong> ECHINOCORYS BREYNIUS 1732. Test ovoid, without trace of anterior groove; ambulacra similar and formed of variable type pores in certain different groups; elongation of the apex variable; periproct almost always a narrow pointed oval, varying in position from near marginal to inframarginal and ventral.
10 J. S. SMISER. — A REVISION OF THE ECHINOID Echinocorys vulgaris var. striata LAMARCK (Anancliytes). Plate 2, flgs. 1 a-d. Echinocorys vulgaris var. striata LAMBERT, 1903, Étude monog. sur Íe genre Echinocorys. (Mém. Mus. roy. d'Hist. nat. de Belg., n° 8 [in vol. 2], p. 53, pi. 2, fig. i.) This variety of vulgaris is present, but quite rare in the Cretaceous of Bel¬ gium. When Lambert described the Belgian Echinocorys in 1903 be bad from Belgium, only one very poorly preserved specimen indicated as coming from the Craie St. Vaast at Frameries. In assigning this specimen to vulgaris var. (') Figures natural size in this and all subsequent illustrations. The distortion noted in some figures is usually an eccentric character of the individual and not due to deformation by pressure.
Page 1 and 2: MÉMOIRES DD MISEE ROYAL D'HISTOIRE
Page 3 and 4: MÉMOIRES DU MISÉE ROYAL D'HISTOIR
Page 5 and 6: 4 .î. S. SMISER. — A REVISION OF
Page 7 and 8: » J. S. SMISER. — A REVISION OF
Page 9: 8 J. S. SMISER. — A REVISION OF T
Page 13 and 14: 12 J. S. SMISER. — A REVISION OF
Page 15 and 16: U .1. S. SMISER. — A REVISION OF
Page 17 and 18: Fie. 3 a-c. — Echinocorys subglob
Page 19 and 20: IS .1. S. SMISER. — A REVISION OF
Page 21 and 22: FIG. 5 a-c. — Echinocorys ovatus.
Page 23 and 24: ±2 J. S. SMISER. — A REVISION OF
Page 33 and 34: 3-2 J. S. SMISER. — A REVISION OF
Page 37 and 38: 36 J. S. SM1SEB. — A REVISION OF
Page 43 and 44: J. S. SMISER. — A REVISION OF THE
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Page 53 and 54: TABLE OF CONTENTS I. — INTRODUCTI
Page 55 and 56: EXPLANATION OF PLATE 1. (all figure
Page 57 and 58: PLATE II
Page 59 and 60: Mém. Mus. Boy. II¡M. Nat. Befe. -
Page 61:
M. HAYEZ, IMPRIMEUR, 112, BUE DE LO
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ECIIINOID GENUS ECHINOCOIÎYS

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