PLATE XXVIII. 



ACANTHONAUTILUS BISPINOSUS, A. H. Foovd. 



Fig. 1. Front view of the only individual yet found, showing the spine on the 

 right-hand side; the shaded one on the other side is a "restoration," put in 

 merely to balance the figure. The sutures of the septa are seen on the right- 

 hand side of the figure (see also PI. XXIX). Clane. Dublin Museum of Science 

 and Art. (Page 118.) 



Vestinautilus carintperus, J. de C. Scnrerlnj, sp, ; var. thiplioatus, var. nov. 



Fig. 2 a. Lateral view of the only specimen collected, showing upon tlie test 

 near the aperture two strong plications, with part of a third, the latter almost 

 entirely removed with the test of which it formed part. 2 /;. Peripheral view 

 of the same individual, showing the " Runzelschicht," and the fine, somewhat 

 regular lines of growth. The plications are shown on the left-hand side of the 

 figure. The emargination above represents the sinus in the aperture. (Owing 

 partly to the way in which the specimen was drawn with reference to illumination 

 these plications are not represented as they appear in the fossil. There is a bold- 

 ness of contour in the centre and more projecting one, which the drawing quite 

 fails to convey any idea of; it is much too soft in outline in the figure [2 a]. In 

 fig. 2 b the plications are still more feebly rendered.) Glenbane. Dublin Museum 

 of Science and Art (Geological Survey Collection). (Page 112.) 



Phacocehas oxtstomum, J PluUips, sp. 



Fig. 3 ft, Lateral view of an imperfect specimen, showing part of the inner 

 whorls and the septation, with the greater portion of the body-chamber. 3 h. 

 Front view of the same, showing the knife-like periphery. Locality unknown. 

 British Museum (" Gilbertson Collection "). (Page 108.) 



DiSCITOOEKAS COSTELLATUM, F. M'Coi/, Sp. 



Fig. 4 a. Lateral view of an imperfect specimen, which is probably part of 

 the one figured by M'Coy ('Synopsis,' pi. ii, fig. 4). 4 6. Peripheral view of the 

 same. Millicent, Clane. Dublin Museum of Science and Art (" Griffith Collec- 

 tion "). (Page 107.) 



