228 Messrs. W. K. Parker, T. R. Jones, and H. B. Brady on 



continuous somewhat waved ribs. Tlie partition- walls are broad 

 and transparent." 



These are interesting figures of one of the thick-ribbed lim- 

 bate NodosarncBy several varieties of which are found in the 

 Adriatic. The distinction between the first, or essential, shell 

 and the thickened, or supplemental, portions is carefully ren- 

 dered. All the straight forms with longitudinal costse and broad 

 transverse bands of clear shell-substance may be included under 

 Linnets Nodosaria Fascia. (For further remarks on these, see 

 Ann. & Mag. Nat. Hist. ser. 3. vol. xii. pp. 432, 433.) 



VII. Nautilus (0.) vaginceformis. The Sheath-shaped Sea-staff. 

 PI. 3. figs. 7 a-7d. [Fig. 7 a. Lingulina carinata, D^Orb. ; 

 fig. 7 bj either Lingulina or Glandulinaj longitudinal section ; 

 fig. 7 Cy d. Marginulina, sp. ?] 



(Trans.) " The shell is broad and flat, with scarcely separated cham- 

 bers, the broad and blunt under surfaces* of which reach far into 

 succeeding chambers." 



This is a mixed group of somewhat indefinite forms, and we 

 do not see that it ought to affect the nomenclature of already 

 well-recognized subtypical species, whilst such uncertainty 

 exists. Although the drawings are made with the same care as 

 the others, we cannot recognize in fig. 7 c, or the sectional dia- 

 gram, fig. 7 dj any form of Marginulina with which we are fa- 

 miliar. It appears as though it might have a rough or sub- 

 arenaceous shell. We shall run the least risk of error or con- 

 fusion in leaving these figures without further comment. 



VIII. Nautilus (0.) leguminiformis. The Pod-shaped Sea-staff. 

 PI. 3. figs. SajSb. [Fig. 8 a. Vaginulina leguminiformis j Batsch; 

 fig. 8 b. Dentalina communis^ D'Orb.] 



{Trans.) "The smooth, almost coincident joints of this elongated 

 shell are nearly cylindrical, and fit into each other like sheaths." 



Fig. 8 a does not so well answer to the description given as 

 the succeeding figure (8 5), it being one of the flattened or 

 Vaginuline group of Dentalince, a form given by D'Orbigny, in 

 his ^Voyage dans PAmer. Merid.^ as Marginulina Webbiana 

 (pi. 5. fig. 17). The trivial name leguminiformis^ however, will 

 take precedence of that given by D^Orbigny. Fig. 8 6 is the sub- 

 cylindrical tapering form known as Dentalina communis, D'Orb. 



IX. Nautilus (0.) globifer. The Button-bearing Sea-staff. 

 PI. 3. figs. 9 «-9 c. [Nodosaria globifer a, Batsch.] 



{Trans.) "The chambers are elongated and somewhat distinct; only 

 * The upper ends or stolon-passages. 



