RHYNCHONELLID A. 185 
Position and Locality. Rh. Llandoveriana appears to be a characteristic fossil of the 
Llandovery period, and occurs abundantly in many Irish localities. I have seen it from 
Lettershanbally, Leenane, Ardaun, Boocaun, County Galway. Prof. M‘Coy mentions 
likewise that it is common in grey quartzites at Blackwater Bridge, in the sandstone of 
Cong, slates of Cappacorcogne, Glencraff, &., all in the County of Galway. 
In Scotland it occurs in sandstone at Saugh Hill, near Girvan, in Ayrshire, and was 
so identified by Mr. Salter, who observed at the same time that the Saugh Hill sandstone 
resembles that of Cong, in Ireland, and that they possess several of the same fossils. 
In England it occurs also in the Upper Llandovery at Damory Bridge, ‘Tortworth (Survey 
Collection). 
RuyncHonetua Weavent, Salter, MS. Pl. XXIV, fig. 14. 
Spec. Char. ‘Triangularly ovate, longer than wide, broadest anteriorly. Valves 
moderately and almost equally convex; fold in the dorsal valve of small elevation, and 
confined to the anterior half of the valve; beak small, incurved. Sinus in the ventral 
valve shallow, aiid visible only close to the front. Surface of each valve ornamented by 
some thirty-three small radiating ribs, of which from five to six occupy the fold 
and sinus. 
Length 53, width 5, depth 33 lines. 
Obs. Of this small species I have seen two specimens only ; and these differed from 
Rh. Llandoveriana in/oeing longer than wide. More examples will, however, require to be 
found and carefully examined before we can feel perfectly certain that the shell may not 
be a variation in form or variety of A. Llandoveriana. In the collection of the Geological 
Society we found a specimen, on the label of which Mr. Salter had written the name 
Weaveri, and which we have figured and described. 
Position and Locality. Upper Llandovery, Long’s Quarry, Tortworth; also at May 
Hill, in the same formation. 
RHYNCHONELLA TRIPARTITA, J. de C. Sow. (sp.) Pl. XXIV, figs. 15—16. 
TEREBRATULA TRIPARTITA, J. de C. Sow. Sil. Syst., pl. xx, fig. 15, 1839 ; and Siluria 
2nd ed., p. 545, pl. ix, fig. 10,1859. 
Spec. Char. Transversely pentagonal, much wider than long. Valves moderately 
convex. In the dorsal valve the fold is wide and convex, while in the ventral valve the 
sinus extends from the extremity of the beak to the front. Surface of valves ornamented 
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