598 THE VOYAGE OF H.M.S. CHALLENGER. 



December 1873. Simons Bay, Cape of Good Hope. 15 to 20 fathoms. 

 Habitat. — Near the mouth of the Knysna river, Cape of Good Hope. 



21. Rissoa (Onoba) arenaria (Mighels). 



Cingula arenaria, Mighels, Bost. Journ. Nat. Hist., 1842, vol. iv p. 49, pi. iv. fig. 24. 



„ „ Mighels, Cat. Shells Maine, Bost. Journ. Nat. Hist., 1843, p 34 (separate 



impression). 

 Rissoa Mighelsi, Stimpson, Proc. Bost. Soc, vol. iv. p. 15. 



,, (Onoba) arenaria, Morch, West Greenland Moll, in Rink's Greenland, No. 55. 



„ Mighelsi, Gould, Inverteb. Massachusetts (ed. Binney), p. 301, fig. 570. 



„ „ Tryon, Mar. Conch. United States, p. 84, sp. 8, pi. si. fig. 160. 



„ arenaria, Jeffreys, Moll. "Valorous," Ann. and Mag. Nat. Hist., 1877, ser. 4, vol. xix. p. 238. 



Station 135c. October 17, 1873. Lat. 37° 25' 30" S.,loug. 12° 28' 30" W. Nightingale 

 Island, Tristan da Cunha. 100 to 150 fathoms. 



Habitat. — Casco Bay, Maine (Mighels) ; West Greenland (Morch) ; also Newfound- 

 land, Finmark, and Spitzbergen, 5 to 40 fathoms (Jeffreys). 



Dr Gwyn Jeffreys considers this Challenger shell a new species "allied to Rissoa arenaria, 

 Mighels and Adams." This species, which Mighels says is very rare, I know only through the 

 solitary specimen which Dr Gwyn Jeffreys kindly sent for my examination, and which exactly cor- 

 responds with the figure and description in Gould ; it is markedly broader than the Challenger 

 specimen, which, however, is identical with it in sculpture and in microscopic markings. 



The name " arenaria " was needlessly changed by Stimpson, who fancied it preoccupied by 

 "Montague;" this last being probably T a slip for Maton and Rackett, whose Helix arenaria (Turbo 

 arenaria of Turton) is (teste Dr Gwyn Jeffreys) Odostomia decussata (Mont.) 



22. Rissoa (Onoba) striata (J. Adams). 



Turbo striatus, J. Adams, Trans. Linn. Soc. Lond., vol. iii. p. 66, pi. xiii. figs. 25, 26. 



„ „ Montague, Test. Brit., vol. ii. p. 326, pi. xiii. figs. 25, 26. 



,, „ Wood, Ind. Test, p. 157, pi. xxxi. fig. 106. 



Rissoa minutissima, Michaud, Rissoa, p. 20, sp. 14, single pi., figs. 27, 28. j, 



,, „ Potiez et Michaud, Gall, de Douai, vol. i. p. 274, sp. 24. 



,, ,, Lamarck, Anim. s. vert. (ed. Desh.), vol. viii. p. 480, sp. 32. 



Cingula aculeus, Gould, Inverteb. Massachusetts, p. 266, fig. 172. 

 Rissoa striata, Forbes and Hanley, Brit. Moll., vol. iii. p. 94, pi. lxxviii. figs. 8, 9. 



,, „ J. Gwyn Jeffreys, Brit. Conch., vol. iv. p. 37, vol. v. p. 208, pi. Ixviii. fig. 2. 



Cingula striata, Weinkauff, Conch. Mittelmeer., vol. ii. p. 284, sp. 11. 

 Rissoa striata, Watson, Madeiran Rissoae, Proc. Zool. Soc. Lond., 1873, p. 368, pi. xxxiv. fig. 3 (not 4). 



„ ,, Reeve, Conch. Icon., vol. xx. pi. v. fig. 40. : 



Onoba striata, G. O. Sars, Moll. Arct. Norv., p. 172, No. 77, pi. xxii. fig. 3. 



„ aculeus, G. O. Sars, MolL Arct. Norv., p. 172, No. 78, pUix. fig. 12. 

 Rissoa (Onoba) striata, Weinkauff, Conch. Cab. (ed. Kiister), p. 154, sp. 37, pi. xix. fig. 2. 

 Onoba striata, Monterosato, Nomenclatura, p. 67. 



