PLATE XLVIII. 



Glyphioceras (s.-g. Beyeichoceras) corpulentum, G. C. CricJc. 



Fig. 1 a. Lateral view of a younger specimen of this species than that figured on PI. XLVII. 1 b. 

 Front view of the same, showing the sutures upon the cast, and a portion of the test. (The lines of 

 growth upon the test are more numerous than they are represented to be in this figure, and the 

 lithographer has omitted to insert the faint longitudinal bands ; the umbilicus is made a little too 

 large in both figures, and in fig. 1 b the line representing the boundary of the umbilicus on the left- 

 hand side of the figure has been made too low down.) 1 c. Suture-lines. (The lateral lobe is too 

 obtuse and the peripheral lobe too narrow.) St. Doulagh's. Dublin Museum of Science and Art. 

 (Page 176.) 



GLYPHIOCERAS ? Sp. 



Fig. 2 a. Peripheral view of an imperfect specimen. 2 b. Lateral view of the same, showing the 

 wide umbilical cavity, and a strong constriction anteriorly. Black Lion, near Enniskillen. Dublin 

 Museum of Science and Art (" Griffith Collection"). (Page 209.) 



Fig. 3 a. Front view of an imperfect specimen. 3 b. Lateral view of the same, showing the inner 

 whorls and large umbilicus. Black Lion, near Enniskillen. Dublin Museum of Science and Art 

 (" Griffith Collection "). (Page 210.) 



Prolecanites compresstjs, J. Sowerby, sp. 



Fig. 4 a. Lateral view of a large specimen elongated by distortion (reduced in this figure to about 

 one-half of the natural size), showing some of the sutures. 4 b. Front view of the same. 4 c. Suture- 

 line of the same (natural size ; the peripheral lobe not preserved ; see fig. 7). Little Island. British 

 Museum. (Page 202.) 



Fig. 5 a. Peripheral view of a specimen distorted similarly to 4 a. 5 b. Lateral view of the same, 

 showing the eroded test, with faint lines of growth anteriorly. Midleton. Mr. Joseph Wright's 

 Collection. (Page 202.) 



Fig. 6. Lateral view of the specimen supposed to be the one figured by M'Coy under the name of 

 " Goniatites discus " (' Synopsis,' pi. ii, fig. 6), showing the sutures (see left-hand side of figure; the 

 other part has been ground too deep to show them properly). Cork (city;. Dublin Museum of 

 Science and Art (" Griffith Collection "). (Page 202.) 



Fig. 7. Suture-line of a specimen from Scarlet, Isle of Man, intended to be supplementary to fig. 

 4 c, as respects the peripheral lobe which is here preserved. 



Fig. 8 a. Lateral view of an entirely septate specimen. 8 b. Peripheral view of the same. " Four 

 miles east of Loughrea," county of Galway. Dublin Museum of Science and Art (Geological Survey 

 ion). (Page 202.) 



