BUDLEIGH-SALTERTON PEBBLE-BED. 329 



of these I have given a series of figures in Sup., PI. XLII, drawn expressly to accompany 

 this Monograph, in order to facilitate comparisons with those species that have been 

 found in the Budleigh-Salterton pebbles. 



1. Strophomena grandis, Soto. Sup., PI. XLII, figs. 1 — 6. Imperfect impres- 



sions and internal casts of this species occur in light-grey quartzite at 

 the Cam of Gorran and Caerhayes. Penzance and Truro Museums. 



2. Orthis calligramma, var. Dal. Pigs. 7 — 10. Distorted internal casts and 



impressions of the exterior occur rather abundantly in a dark-grey or 

 greenish ferruginous rock, at the Cam of Gorran Haven, Great Peraver, 

 Caerhayes, and St. Austell. It does not appear to occur in the light- 

 grey quartzite. Good examples may be seen in the Museums to which 

 I have already referred to. 



3. — scotica, Dav. Pigs. 11, 12. I believe some impressions of separate 



dorsal valves, occurring in the same rock along with 0. calligramma, 

 may probably belong to this species. Gorran Haven. Penzance 

 Museum. 



4. — Berthosi, var. cornubiensis, Tromelin. MS. Pigs. 14, 15. An internal 



cast of a single dorsal valve, and some imperfect impressions of the 

 exterior, have been collected. Pig. 14 a shows the interior of the 

 dorsal valve taken in gutta-percha from the internal cast (fig. 14). I 

 believe this must be the fossil Prof. M'Coy has mistaken for his Orthis 

 turgida. M. de Tromelin believes it to be a variety of Orthis Berthosi, 

 Rouault. It occurs in a ferruginous sandstone at Caerhayes. The 

 figured specimen belongs to the Truro Museum. 



5. — Budleighensis, Dav. Figs. 16 — 25. I need not here anticipate what I 



have said further on with respect to this species in my description of 

 the shell as found at Budleigh-Salterton. No doubt it is the fossil 

 referred to Orthis testudinaria, Dalman, by Prof. M'Coy. Pig. 26 of 

 my plate is taken from one of Dalman's types in the Stockholm 

 Museum, and given here for the sake of comparison. When one 

 compares it with such specimens as fig. 21, and others from the 

 Cornish light-grey quartzite, one cannot help feeling that Prof. M'Coy 

 had some grounds for his identification. 



Orthis Budleighensis (better known by the mistaken name of 0. redux, Barrande) 

 occurs sparingly in light-grey quartzites at the Cam of Gorran Haven, at Caerhayes, and 

 Gorran's Bay, from which localities specimens may be seen in the different Museums 

 already named. Examples of the same species have been also discovered by Mr. Collins 

 in a continuation of the same band of quartzite south of the Helford river. 



It is very evident from the original tablet in the Cambridge Woodwardian Museum 



