SUPPLEMENT, PLATE XXXIV. 
Fig. 
I. 
2, 2 «, b. 
CAKBONIPEROUS. 
^jiirifera striata, Martin. The spiral appendages developed by the Rev. Norman Glass. Car- 
boiiit'erous Limestone, Clitheroe, Yorkshire. (P. 27-1.) 
„ triffonalis, ftlartin. A remarkable example, with a very extended mesial fold. Car- 
boniferous Limestone, Arden, Tliornliebank, near Glasgow. Collection of 
Mr. J. Young. (P. 276.) 
3, 3 a. „ „ var. bisulcata, Sow. Carboniferous Limestone Shales, Thornliebank. 
Hunterian Museum College, Glasgow. (P. 276.) 
■i, 4 a. ,, var. bisulcata. Upper Limestone Shales, Williamswood, Cathcart, near 
Glasgow. Collection of Mr. J. Young. (P. 276.) 
5. „ ,, var. triangularis, Martin. Carboniferous Shales, Carluke, Lanarkshire. 
Collection of Dr. Rankin. (P. 276.) 
6. ,, triradialis, Phillips. Lower Carboniferous Limestone, Dockra Quarry, near Beith, 
Ayrshire. Collection of Mr. J. Neilson. (P. 263.) 
7. Athyris Roijssii, I'Eveille. Carboniferous Limestone, Trearne,near Beith. Spirals developed by 
Mr. J. Neilson. (P. 271.) 
8. Sj)irifera lineata, Martin. Carboniferous Limestone, Beith. An elongated specimen. 
9. „ „ Portion of shell, greatly magnified, to show external sculpture and character of 
the concentric rows of spines that invest its surface, a, Concentric lines or 
ridges of growth; b, roots of spines, exhibiting at their base the two cylin- 
drical pores or canals arranged as in a double-barrelled gun ,• c, mesial 
longitudinal depression on the surface of flattened spine* ; d, part of a spine, 
of which the upper portion has been partially removed to show the double 
tubes separated along the middle; e, minute perforations or punctures, 
believed to traverse thickness of shell. Carboniferous Shale, Capelrig, 
East Kilbride, Lanarkshire. (P. 275.) 
Athyris ambigva, Sow. With mesial fold much produced, deep sinus, and of which the edges 
are somewhat pinched upwards in a narrow fold, which slopes gently 
upwards. Carboniferous Limestone Shale, Corrieburn, Campsie. Collec- 
tion of Mr. J. Young. (P. 283.) 
„ ,, An elongated specimen. Carboniferous Limestone, Beith. Collection of 
Mr. J. Neilson. (P. 283.) 
,, Royssii, L'Eveille. A large fine example. Carboniferous Limestone, Penton Linn, 
Dumfriesshire. Collection of Mr. J. Thomson. (P. 271.) 
Rhynchonella angidata, Linne. Carboniferous Limestone, Athlone, Ireland. Belfast Museum. 
14 a, b. ' „ Brockleyensis, Dav. 14. Natural size. 14 a, b. Enlarged. Carboniferous Lime- 
stone, Brockley, Lesmahagow. Collection oC Mr. J. Thomson. (P. 285.) 
Orthis Michelini, L'Eveille. Culm Measure Limestone, Westleigh, Devonshire. Collection of 
Rev. W. Downes. (P. 292.) 
16,16 a, 17. „ „ 16. Literior surface of ventral valve. Carboniferous Shales, Roughwood Quarry, 
Beith. 16 tt. A portion of the inner surface, greatly magnified to show 
the pores or perforations covering principally raised ribs, with nearly 
smooth interspaces. These punctures traverse the entire thickness of shell. 
17. Exterior surface of shell, greatly magnified, a. Large pores or root of 
broken large spines ; b, perforations due to smaller spines (?), forming the 
second series of pores. These pores do not traverse the thickness of shell. 
c, Minute perforations, which alone traverse the thickness of the shell. 
(P. 294.) 
) 8. Chonetes Laquessiana, de Kon. From the Carboniferous Culm Measures, Westleigh, Devonshire. 
Collection of Rev. W. Downes. (P. 312.) 
19,20 c. „ „ var. ^«7)6m</«, M'Coy. 20. From rotten Limestone, Dockra Quarry, Beith. 
Collection of Mr. J. Neilson. 19. Carboniferous Limestone, Corrieburn, 
Campsie. Collection of Mr. J. Young. 19 a and 20 a. Enlarged. (P. 313.) 
* Since writing the above description, Mr. John Young has infornned me that, while manipulating a 
frond of Fenestdla from the Blantyre Shales by a process he discovered, wherein he fixes the non-celluli- 
feious face of the frond to a layer of melted asphalt, to which it firmly adheres, and afterwards placing 
the shale in water for a time, the frond parts from the shale, with its celluliferous face exposed, and often 
in beautiful preservation, he accidentally exposed a crushed specimen of Spirifera lineata, which he 
saw was covered by its delicate hair-like spines. On looking at these spines under his eye-glass, to his 
great astonishment he dicovered that they were barbed spines, set with little curved booklets that were 
directed towards the free end of the spines. The accompanying diagrammatic sketch by Mr. Young will 
convey some idea of their appearance. The booklets are seen to lie in two rows, and are placed nearly 
opposite to each other in pairs. They are somewhat long and slender, their base being less than one 
foin'th the diameter of the spine. The hair-like spines on this specimen extend fully three eighths of 
an inch from the shell, but were probably a little longer. On an average, continues Mr. Young, there 
will be at least twelve pairs of booklets in one eighth of an inch in length, or thirty-six pairs on the 
largest spine. On some of the spines can be seen a trace of the shallow groove that runs along the 
middle and separates the one tube from the other, and it is just possible that these spines may have 
carried more than two rows of booklets round their circumference, but from the way the spines' 
lie in the matrix of shale only two rows are visible. Mr. Young thinks that the finding of this new 
and distinctive character in this remarkable species is a point of considerable interest, for he knows of 
no other species amongst the Brachiopoda that have spines carrving booklets. Fragment of Spirifera lineata greatly magnified, 
showing booklets on the spines, a a, broken spines at their base showing double pores; b, flattened spines with booklets. 
Carb. shales, Newfield, High Blantyre, Scotland. Collection of Mr. J. Young. 
10. 
11. 
12. 
13. 
14, 
15. 
