KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 50. N:0 5. 43 



and rounded at its base», biit the pillar-lip is »broadly reflected on the columella above 

 and narrowing as it descends», which is characteristic of Acrybia flava. 



MiDDENDORFF ill 1849 described two shells of the present species, whicli he, liow- 

 ever, identified with Natica flava Gould. The characteristics of the species he expresses 

 in the diagnosis and says further (pag. 422): »Abgesehen von den deuthchen Anwachs- 

 streifen, ist die Oberhaut, insbesondere auf dem Gewinde, dicht mit mikroskopischen, 

 gewelJten Längsstreifen besetzt». In 1851 Middendorff makes the following remarks 

 on the same form (pag. 207): »Dass die jenigen Konchyhen, welche ich hier als iV^a^. aperta 

 Lov. und andererseits im 2:ten Hefte meiner »Beiträge zu einer Malacozoologia Bossica» 

 als N, flava Gould beschrieben habe in der That spezifisch von einander verschieden 

 sind, däran känn ich gar nicht zweifeln; auch glaube ich in Bezug auf N. aperta Lov. 

 sicher gegangen zii sein; niir wäre es möglich, dass meine iV^. flava nicht identisch mit 

 Gould' s Art, sondern neu wäre. » 



Leche (1878) and Aurivillius (1887) include the present species in Natica pallida, 

 the låter author with no remarks upon the sculpture. Leche has indeed observed the 

 characteristic striation (pag. 50): »Natica pallida exhibits sharp circular lines, that be- 

 come rather conspicuous under the magnifier, just as Natica flava does according to 

 Gould. Middendorff has not observed them, since he says in the diagnosis of N. pallida: 

 'testa Isevi'.» Leche mentions a specimen of »Natica flava Gould», which he says is 

 identical with Mddendorffs N. flava; this specimen is, however, the true L. pallida (cfr 

 page 32 and Pl. 3, Fig. 36 of this work). The resemblance of L. tenuistriata to N. (Acry- 

 bia) flava was also pointed out by Dautzenberg feFiscHER 1911; but the structure of 

 the radula places it beyond all doubt that it is a true Lunatia. 



Hägg (1905^ includes it in Natica groenlandica (pag. 20), but remarks: »Nur das 

 eine Exemplar von No. 1 hat konzentrische Striierung. Dieses Exemplar hat niedrigere 

 Spira und weniger deutlich abgesetzte Windungen als die anderen beiden. » 



Odhner (1910) remarks about »Lunatia groenlandica» from Zeeland (pag. 7): 

 »In the sculpture of the shell, consisting of fine spiral strise, these specimens differ from 

 the normal type of the species. As similar specimens also occur in other districts and 

 as there are all stages of transitions from sculptured to smooth shells, tliey cannot be 

 considered as a distinct Iceland variety. » 



General Distribution: 



Nova Zembla (Dautzenberg & Fischer 1911); D:o (h. 35) and St. Paul Island, 

 Behring Sea (h. 39; Middendorff 1849 as Natica flava Gould). 



