GLYPHIOCERAS ?. 209 



apart, but the peripheral (external) lobe is of such a length that the apex is 

 invaginated in the opening of the preceding lobe, thus bringing the septa into 

 close connection at this point. Test ornamented in all stages of growth with 

 very delicate, apparently imbricating, transverse striae, which are perfectly distinct, 

 and are therefore an important specific feature. After leaving the border of the 

 umbilicus they form a broad forwardly directed curve, and then bending backwards 

 make rather a deep hyponomic sinus upon the periphery. Very faint and distinct 

 lines of growth appear upon the cast of the body-chamber. The narrow periphery 

 is produced into a slight keel. Shallow and slightly undulating constrictions 

 appear on the young shell. 



Affinities. — This species is readily distinguished from other Carboniferous species 

 of Bmncoceras by its form and ornamentation. In the former the most remarkable 

 feature is the angularity of the periphery. 



Remarks. — This species was labelled " Goniatites excavatus " on the tablet to 

 which it was affixed, and I at first accepted this interpretation of its affinities, but 

 in looking more closely at it I found that the sutures were clearly and sharply 

 defined upon the hollow mould left by the removal of the innermost whorls in 

 extracting the fossil from the rock. An inspection of them left no doubt as to their 

 being those of Bmncoceras, and according to this view I have allocated the speci- 

 men, with a specific name derived from the locality in which it was found. 



Locality. — Black Lion, near Enniskillen, county of Leitrim. 



GrvpinocEKAS ? sp. Plate XLIII, figs. 4 a, 1>. 



The specimen here figured in two aspects is a cast without any trace of the test 

 remaining upon it. I had at first assigned it to G. mutabile, .1. Phillips, but its im- 

 mature condition and the absence of any characters which could connect it definitely 

 with that species induces me after all to leave it unnamed as the wiser course. 



Locality. — Gregg, near Nobber, county of Meath. 



Glypitioceeas ? sp. Plate XLVIII, figs. 2, a, b. 



This is the cast of the body-chamber of a small shell, which is partly embedded 

 in the matrix. The shell is compressed, with a narrowly rounded periphery and 

 rather flattened sides. The umbilicus is wide and deep, with steep sides having 

 angular margins. The inclusion leaves very little of the inner whorls exposed. The 

 ornamentation consists of very delicate imbricating transverse strire. The diameter 

 of the shell is about 26 mm., while that of the umbilicus is 11 mm., thus about two- 

 fifths. As the suture-line is not seen the generic position of this shell is doubtful. 



Locality . — Black Lion, near Enniskillen, county of Leitrim. 



