. Bulletin of the British Museum (Natural History), Geology. 120 SMITH, PAUL, GALE & DONOVAN periproct. peristome Fig. 44 Camera lucida drawings of plating in Echinogalerus faba () from the Lower Ceno- manian of Wilmington: a, apical disc; b, oral area between peristome and periproct. Echinogalerus rostratus (Desor 1842) PI. 22, figs 1-4; PI. 23, figs 1-4; PI. 24, figs 6, 7; Figs 42, 45 18406 Caratomus rostratus Agassiz: 7 [nomen nudum~\. 1842 Caratomus rostratus Agassiz; Desor: 38; pi. 5, figs 1-4. 1855 Caratomus rostratus Agassiz; d'Orbigny: 367; pi. 941, figs 1-5. 1855 Caratomus
. Bulletin of the British Museum (Natural History), Geology. 120 SMITH, PAUL, GALE & DONOVAN periproct. peristome Fig. 44 Camera lucida drawings of plating in Echinogalerus faba () from the Lower Ceno- manian of Wilmington: a, apical disc; b, oral area between peristome and periproct. Echinogalerus rostratus (Desor 1842) PI. 22, figs 1-4; PI. 23, figs 1-4; PI. 24, figs 6, 7; Figs 42, 45 18406 Caratomus rostratus Agassiz: 7 [nomen nudum~\. 1842 Caratomus rostratus Agassiz; Desor: 38; pi. 5, figs 1-4. 1855 Caratomus rostratus Agassiz; d'Orbigny: 367; pi. 941, figs 1-5. 1855 Caratomus orbicularis d'Orbigny: 369; pi. 941, figs 6-10 [non Agassiz]. 1875 Caratomus rostratus Agassiz; Wright: 255; pi. 57, fig. 2. 1921 Echinogalerus (Rostrogalerus) rostratus (Agassiz) Lambert & Thiery: 332. Material. This species is moderately common at Wilmington and much material both loose and in situ was collected. Thirty of the best preserved specimens () were analysed biometrically and form the basis of the following description. All stratigraphically located material was also analysed biometrically for evolutionary changes. Stratigraphical occurrence and distribution. The species occurs through much of the succession at Wilmington, from 1020 cm below standard datum up to the datum level. It is most common in the Wilmington Sands from 400 to 600 cm below standard datum (Fig. 7, pp. 18-19). Two specimens have been collected from the top of the Wilmington Limestone; it thus ranges from the Lower to Middle Cenomanian. It also occurs in the Cenomanian green- sands of the Warminster district. Description. SIZE AND SHAPE. This is a small species, with a test size ranging from 50 to 9-4mm in length (mean = 7-0mm; SD = IT; N = 30). The maximum width of the test is 78-93% of the test length (mean = 86%; SD = 4-3; N = 30) and the widest point on the test Plate 22 Echinogalerus rostratus (Desor) Figs 1-4 , stratigraphically high, rostrate form: 1, apical; 2, oral; 3
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