REPORT ON THE GASTEROPODA. 625 



Order OPISTHOBKANCHIA, Milne-Edwards, 1848. 



Family Tornatellid^e, Fleming, 1828. 

 Genera. 1. Actoeon, Montfort. 2. Aplustrum, Schumacher. 3. Ringicula, Deshayes. 



1. Actoeon, Montfort, 1810. 



Montfort's name for this genus precedes Lamarck's Tornatdla by two years. In regard to the 

 genus Actceonina, d'Orb., which from my view-point is better regarded as a subgenus, some confusion 

 has prevailed. Acteocina, Gray (Proc. Zool. Soc. Lond., 1847, p. 160), may be set aside at once; it 

 is a name and no more. Actceonina was proposed by d'Orbigny in 1847 (Palasont. Franc., vol. ii. 

 p. 162), and again in 1850 (Prodrome, vol. i. pp. 118, 353), and was intended for some fossil forms, 

 regarding which any one desirous of further information may consult Morris and Lycett, Mollusca, 

 from the Great Oolite, Palasont. Soc, 1850, vol. i. p. 102, pi. v. figs. 11, 12, and pi. xviii. figs. 14, 15; 

 Supplement Paleeont. Soc, 1863, pp. 26-28, 106, 107, pi. xxxi. figs. 9-13 {per err. 16); also Pictet, 

 Paleontologie, 2d ed., vol. iii. pp. 102-106, pi. lx. figs. 13-22 ; also Chenu, Manuel, vol. i. p. 225. 



Deshayes, in his Animaux sans vertebres du bassin de Paris, vol. ii. p. 613, substitutes for 

 Actceonina the name Orthostoma as of earlier date. Agassiz in the Index Universalis (Soleure 

 edition, p. 764), quotes for this name " Gray, Moll. 1840" (syn. Brit. Mus.), but the name Orthostoma 

 belongs to Conrad (see Geol. Report, New York, p. 115), 1838, and was proposed for a "genus 

 Nautileorum," a fact which, of itself, would exclude it from rivalry with Actceonina, apart altogether 

 from the consideration that the name had been already proposed in 1831 by Ehrenberg for a genus 

 of Vermes, and by Serville, in 1834, for some of the Coleoptera. 



The forms embraced in this subgenus seem somewhat miscellaneous, but the Challenger shells 

 may quite safely come under the convenient definition of Pictet (loc. cit. supra), " Les Acteonina 

 — leur forme normale est celle d'actasons sans dents." 



Species. 



1. Actceon exilis, Jeffr. 7. Actceon amabilis, Wats. 



2. Actceon flammeus (Gmelin). 8. Actceon {Buccinulus) affinis (A. Adams). 



3. Actceon globulinus (Forbes). 9. Actceon {Buccinulus) insculptus (Reeve). 



4. Actceon pusillus (Forbes). 10. Actceon {Buccinulus) niveus, Angas. 



5. Actceon turritus, Wats. 11. Actceon {Buccinulus) cinereus, Wats. 



6. Actceon austrinus, Wats. 12. Actceon {Acteonina) edentulus, Wats. 



13. Actceon {Acteonina) ckariis, Wats. 



1. Actceon exilis, Jeffreys. 



Actceon exilis, Gwyn Jeffreys, Medit. Moll, Ann. and Mag. Nat. Hist., 1870, ser. 4, voL vi. p. 85. 

 ,, „ Gwyn Jeffreys, "Valorous" Dredgings, Ann. and Mag., &c, 1877, ser. 4, voL xix. p. 335. 



,, „ Monterosato, Enumerazione, p. 51. 



(ZOOL. CHALL. EXP. — PART XUI. — 188G.) Tt 79 



