. Bulletin of the British Museum (Natural History), Geology. 58 Sanguinolaria sulcata Phillips 1836 to be the type species of Allorisma by original designation of King (1844: 313). In his original description of Allorisma, however, King mentions several species and only in the letter of introduction to his paper does he refer to the new genus 'Allorisma for species represented by Sanguinolaria sulcata. Ph'. This does not seem to represent an explicit designation of type species, whereas in 1850 King made a definite designation. Wilson (1960: 112) chose a lectotype for Hiatella sulcata Fleming
. Bulletin of the British Museum (Natural History), Geology. 58 Sanguinolaria sulcata Phillips 1836 to be the type species of Allorisma by original designation of King (1844: 313). In his original description of Allorisma, however, King mentions several species and only in the letter of introduction to his paper does he refer to the new genus 'Allorisma for species represented by Sanguinolaria sulcata. Ph'. This does not seem to represent an explicit designation of type species, whereas in 1850 King made a definite designation. Wilson (1960: 112) chose a lectotype for Hiatella sulcata Fleming from amongst Fleming's specimens, and presented evidence that Sanguino- laria sulcata Phillips 1836 should be regarded as a synonym of Hiatella sulcata Fleming 1828. Synonyms. Edmondiella Chernychev, 1950: 74 (type species, Sanguinolaria sulcata Phillips 1836 by original designation). Edmondia King 1850 pars (1850: pi. 20, figs 1-2) (not Edmondia de Koninck, 1844). Description. Thin-shelled, elongate oval, with umbones situated distinctly towards the front. Rather evenly rounded over the surface of the shell and lacking a distinct escutcheon or lunule. Ornament of well developed rounded rugae more or less parallel to the external margin. In internal impressions a smooth area is marked off by the anterior adductor. Has a distinct internal ridge or lamellar plate as in other Edmondiidae. Hinge lacks teeth and apparently with an external opistho- detic ligament. Anterior adductor muscle scar moderately well marked at right angles to margin in front of umbones rather than vertical. Two other separate muscle attachment marks are associated with the adductor (Fig. 3). The longer scar runs parallel to the front part of the dorsal margin and behind has a distinct buttress (clavicle). At the dorsal end of the buttress is the rounded mark of another muscle. The two smaller muscles perhaps represent the pedal protractor and retractor. The posterior adductor muscle is poorly marked but a p
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