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SUPPLEMENT TO TPIE BRITISH 
of moderate depth, three longitudinal ribs occupying its surface. The ribs on tlie lateral 
portion of the valve are sharply bent upwards prior to becoming abruptly bent down- 
wards or deflected to meet the margin of the opposite valve. Beak angular, moderately 
produced. In the interior of the ventral valve the conjoiued dental plates fprm a wide 
trough-shaped process fixed to a low medio-longitudinal plate. In the dorsal valve the 
space between the socket is occupied by a small cardinal muscular process, on either side 
of which are two long, slender, curved processeSo Prom beneath the cardinal process a 
high vertical mesial septum extends to a little more than a third of the length of the 
valve, supporting along and close to its upper edge a spatular process, considerably 
dilated towards its free extremity, and projecting with a slight upward curve to near the 
centre of the shell. 
Length 13, width 14, depth 7 lines. 
Some examples have shghtly exceeded the above-named dimensions. 
Obs. — Pour specimens of this well-marked species were forwarded to me for exami- 
nation by Prof. W. King as a new species of Camarophoria, but it seems to difier from 
Wiynchonella or Camaroplioria {?) isorhyncha, M'Coy, in being more subtrigonal and less 
globose or gibbous than in the single example of isorhyncha I have ever seen. Among 
the specimens forwarded to me of the species under description was a good internal cast, 
showing in a very clear and satisfactory manner the characters of the genus ; the muscular 
impressions are well defined on the surface of the dorsal valve (fig. 13). The ribs on the 
lateral portions of the ventral valve are, as in Mh. pleii.rodon, most elevated and turned up 
close to the front, where they are suddenly deflected, so as to meet the corresponding 
margin of the opposite valve. 
This species was found by Prof. W. King in the Carboniferous Limestone near 
Kiltiernan, about eight miles south of Galway^ on the road to Gont. The specimens 
figured belong to Queen's College, Galway. I have named it after my distinguished 
friend. Prof. W. King, D.Sc, the discoverer and first delineator of this excellent genus, 
and whose numerous and very valuable researches among Palliobranchs have added 
vastly to our knowledge of the subject, and are well known and highly appreciated by 
all those who have made palaeontology their study. 
Genus Streptoiihynchus, Kiny. 
28. Streptorhynchus crenistria, Phillips. Dav., Carb. Mon., p. 124, PI. XXVI, 
figs. 1—6 ; PI. XXVII, figs. 1—7 ; 
Sup., PI. XXXVII, figs. 1—5. 
Since publishing my description and illustrations of this important and very variable 
species, as well as of its named varieties, at p. 124 ef seq. of my Monograph, very much 
