— 84 — 

 9. Natica affiuis Gmelin. 



Tat'. 53, Fig. 1 — 8. 



Testa globosa, solidula, laevis, nitida, unicolor alba, in spcciminibus adultis oranino exumbilicata. 

 Spira brevis sed distincte elovata. Anfractus 4 — 472 convexiusculi, ultimus magnus, inflatus, infra suturani 

 distincte impressam subplanatus et distinctius striatus. Apertura semicircularis, faucibus levissime fusces- 

 centibus; peristoma simplex, obtusum, margine externo aequaliter arcuato, columellari strictiusculo, callo 

 ad insertionem marginis externi distincto, dein tenui, ad umbilicum semiovale dilatato et umbilicum 

 oninino occludente induto. Operculum calcareum, extus concaviusculum, striatum. 



Alt. pleruinque 10 Mm. liaud attingens, interdum 25 — 30 Mm. superans. 



Nerita affinis Gmelin Systema Naturae ed. XIII p. 3675. — (Natica) de Kay, Moll. New-York 

 V p. 122 t. 7 Fig. 150. -- Mürch, in Rink Grönland No. 73 Ofversigt Island Blöddyr in Vedensk. 

 Middel. 1868 p. 24. - Jeffreys Brit. Conch. V p. 215 t. 102 fig. 3; id. Valourous Moll, in Ann. Mag. 

 N. II. (4) XX p. 318 (animal); id. Proc. Zool. Soc. London 1885 p. 35. — Watson Challenger p. 430. 

 — Friele Catalog p. 272. — ■ Monterosato Enumer. e Sinon. p. 36. — Posselt Ostgrönland p. 81. — 

 Norman in Journal of Conchol. II 1879 p. 54. — Sars*) Mollusca Norveg. arct. p. 159 t. 21 Hg. 14. — 

 Kobelt Prodromus p. 67. 



Natica clausa Broderip and Sowerby Zool. Journal IV 1829 p. 372. — Gould Invert Massach. 

 p. 238 fig. 167; ed. Biuney p. 342 fig. 612. — Gray Voy. Beechey p. 136 t. 34 fig. 3, t. 36 fig. 6. — 

 Reeve Concholog. icon. p 113. — Loven Index Moll. Scand. 1846 p. 17. — Searles Wood Crag Moll, 

 p. 147 t. 16 fig. 12. — Middendorff**) Beitr. Malac. ross. II p. 91. - Philipp! in Martini-Chemnitz ed. II 

 t. 14 fig. 6. — Schrenck Amurland Mollusca II p. 573. — Sars Moll. Norveg. Arct. p. 165 t. 21 fig. 12, 

 13. — Leche Novaja Semlja p. 49. — Dunker Index Moll. Japoniae p. 10. — Sowerby Thesaurus p. 96 

 t. 457 fig. 48. — Verrill Transact. Connect. Acad. VI 1 p. 268. — Krause Bchringsmeer in Archiv f. 

 Naturg. 1885 p. 266. Ostspitzbergen p. 352. — Tryon Manual VIII p. 30 t. 9 fig. 65, 67, 69, 73. 



Natica consolidata Couthouy in Boston Journ. Nat. Hist. II 1839 p. 89 t. 3 fig. 14. — Philippi 

 Abbildungen I p. 17 t. 1 fig. 11. 



Natica janthostoma Deshayes Revue Zool. Soc. Cuvierienne p. 301. Magasin de Zoologie 1841 

 Moll. p. 45. — Reeve Concholog. Icon. sp. 79. — Philippi in Martini-Chemn. ed. II p. 53 t. 8 fig. 8. — 



*) T. ininuta, saepius minus solida, semipellucida, uniformiter alba, forma gloliosa, spira brevi scd distincto elovata, 

 aufractibus 4 minus convexis, ultimo sat magno facie ventrali subplanulato, sutura haud profunda; apertura semicirculari, labio 

 externo aoqualius arcuato, interno sat incrassato, callo umbilicali angusto, somiovato, vix coucavo. Superficies laevis, nitidula 

 striis incrementi tenuissimis, opidormidc plerumque obsoleta. Long. max. 8 Mm. 



**) Testa solidissima opaea, cinereo-carnea, globosa, spira brevi ot obtusa, aufractibus 5 ventricosis ad suturani planu- 

 latis et leviter excavatis, ultimo magno et tumido, sutura parum profunda, apertura'ampla, 3 /< testae longitudinis occupante, labio 

 externo sat expanso, interno valde incrassato, callo umbilicali fere semicirculari subconcavo. Superficies laevis, striis modo 

 incrementi tenuibus arcuatis obducta, epidermide distincta intense fusco-rufescente tecta. Long. 15 mm. — Var. elatior 

 Midd. testa ovato-globosa, spira quam solito magis elata, subturrita, anfractibus aequaliter convexis, ad suturani rix excavatis, 

 epidermide pallide cinereo-carnea tecta. Long, usque ad 20 Mm. 



