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Show 812 MR. G. E. DOBSON O N T H E A N A T O M Y [June 21, Fig. 4. Buliminus (Achatinelloides) hadibuensis, var. alba, p. 804. 5, 5 a. Buliminus (Achatinelloides) balfouri, n. sp., p. 804. 6. Buliminus (Achatinelloides) tigris, n. sp., p. 805. 7. ( ) zebrinus, n. sp., p. 806. 8. ( ) longiformis, n. sp., p. 806. 9. ( ) semicastaneus, n. sp., p. 807. 10. ( ) , var. alba, p. 807. 11. Enncea passamaana, Petit, p. 808. 11 a and 11 b, views of basal portion, from right side and below. 12. balfouri, n. sp., p. 809. 12a and 126, right side of base, and as seen from below vertically to columella. 13. Pupa socotrana, n. sp., nat. size, p. 809. PLATE LXIX. Fig. 1. Stenogyra yollonsirensis, n. sp., nat. size, p. 809. 2, 2 a. Stenogyra fumificata, n. sp., nat. size, p. 810. 3. Stenogyra Jessica, n. sp., p. 810. 4. adonensis, n. sp., p. 810. 4a, right side of base. 5. Stenogyra (Subulina?) enodis, n. sp., p. 811. 6. (Opeas?) hirsutus, n. sp., p. 811. 6a, epidermal hairs, magnified. 7, 7 a. Buliminus (Pachnodus) heliciformis, n. sp., p. 807. 8. Buliminus (Pachnodus) frayilis, n. sp., p. 808. 9. ( ) adonensis, n. sp., p. 808. 9 a, the columellar margin, enlarged. 10. Buliminus (Achatinelloides) yollonsirensis, n. sp., p. 805. 11. Notes on the Muscular Anatomy of Cercopithecus callitrichus. By G. E. DOBSON, M.A., M.B., &c. [Eeceived April 5, 1881.] Having lately had occasion, while working at a question on general comparative anatomy, to dissect partially a fine male specimen of Cercopithecus callitrichus*, I offer the following notes, then made, to the Society for publication, as they contain some points of considerable morphological interest. Anterior bellies of the digastrics greatly expanded and partially double, occupying the whole intermandibular space, but united by their fascial margins only, connected posteriorly by an aponeurotic expansion with the body of the hyoid bone, the greater cornu of which is also connected laterally by a tendinous band with the well-developed intermediate tendon above, and behind by a small tendon with the lower margin of the muscular fibres forming the posterior part of the muscle, which are inserted obliquely into the intermediate tendon, the infero-internal margin of which is seen to be directly * The following are the measurements of this specimen :-Length of head and body (along back) 3' 7"*25; tail 2' l"-25; ear l"*2xl"; elbow to end of middle finger 9", knee to end of middle toe ll"-75, manus 3"*4, pollex l"-5 middle digit 1"*5, pes 5"*3, hallux 1"*2, middle digit 2". |