BIHANG TI1,L K. SV. VKT.-AKAD. IIANDL. BAND 7. NIO 5. 21 



rescmblos somewliat A. obticsus from tlic Weulock shales (C^. 

 'lour. Gcol. Soc. Vol, 36. Pl. 14, fig. 16) but difFers in tlie 

 form of tlie denticles. 



var. c. Pl. 3, fig. 58. The jaw platc triangulär, witli a 

 ucarly flat upper snrface; thc shank is small and inciirved. 

 The frec margin has three blimtcd denticles, followed, after 

 a short interval, by 7 very minute ones. Length 0,4 5 mm.; 

 width 0,31 mm. 



Locality. Wisby. 



Arjibellites uncinatiis, n. Plate 3, figs. 59 — 63. 



Jaws consisting of a stout, simple, conical or compressed, 

 straight or cnrved hook, with an elongated, narrow, liollow 

 base, at rio-ht ano-les to the direction of the hook. The hook 

 itself is hollow, and continuous with thc cavity inclosed by 

 the base. The base is only extended in the direction towards 

 which the hook is curved. In one specimeu (fig. 63) there 

 is a small projecting spiir extending below the hook. The 

 hook itself varies in length between 0,24 and 0,7 mm., whilst 

 the base in the different specimeus is generally a little longer 

 than the hook ; in one specimen however it is half as long 

 again, and measures 1 mm. The examples are numerous. 



This jaw resembles in form, thoiigh relatively much lar- 

 ger, the distal jaw in the mouth armature of Arabella (Oenone) 

 maculata, Edwards sp.; a similar form also occurs in existiug 

 species of Oenone and allied genera. In the jaw apparatus 

 of Hälla parthenopeia, Delle Ch. (of which a specimen has 

 been kiudly presented to me by Prof. Ehlers) the terminal 

 jaw of the series consists of a simple hook (with but a slightly 

 extended base), similar to these fossil forms. 



Locality. Wisby. 



Genus LUMBRICONEREITES Ehlers. 

 Luml)riconereites obliquus, Eichwald sp. Pl. 3, figs. 64 — 67- 

 1854. Sphagodtis obliquus, Eichwald. BuU. de la Soc. Imp. d. Nat. 

 de Moscou p. 110, Taf. 2 f. 10. 



1856. Aulacodus obliqinis, Pander. Monog. d. foss. Fische d. Sil. 

 Sys. d. Russ. Balt. Gouv. p. 72, Taf. 4 f. 16 a, b, c, d. 



1879. Eunicites contortus, Hinde. Quart. Jour. Geol. Soc. Vol. 35 

 p. 375. Pl. 18, fig. 4. 



1879. Eunicites clintonensis, Hinde. Ib. p. 381. Pl. 19, f. 21. 



1880. Lwnbriconereites basalis, Hinde. Ib. Vol. 36, p. 376. 



