CONCLUDING SYNOPTICAL OBSERVATIONS. 227 



basin of the Lower Cretaceous period ; their TrigonicB are for the most part special to them ; 

 T. peninsularis, Coq., is an abnormal example of the Cosfatce ; T. Pideti, Coq., and 

 T. abrupta, Coq., belong the Scabrce ; T. Hondeana, Coq., to the Quadrates. Neither of 

 the two latter forms will allow of any close comparison with the South American species 

 from the equatorial region, to which the same names had previously been given by Lea 

 and by Von Buch. Their localisation is as distinct as that of the British Upper Neocomian 

 TngonitB. 



The Spanish T. abrupta is nearly allied to a small British Trigonice from the Chloritic 

 Marls of South Devon (see T Meijeri, p. 125, PI. XXIII ; also PI. XLI, figs. 15, 16). The 

 two very dissimilar figures given of the American species in the works of Von Buch and 

 D'Orbigny will, perhaps, account for this supposed identity between the American and 

 Spanish species. 



From near the western coast of the same peninsula, in the vicinity of Torres Vedras, 

 a series of Testacea has been described and figured by Mr. D. Sharpe (' Quart. 

 Jour. Geol. Soc.,' vol. vi, pis. 20 — 24, and referred to the Subcretaceous, or lower 

 portion of the Cretaceous rocks. Among them is Trigonia Lusitanica, Sharpe, a 

 characteristic example of the Scabra, previously figured by Goldfuss, together with three 

 other TrigonicBi all of which the latter author erroneously referred to the T. literata of 

 Young and Bird and of PhilHps. The Neocomian T. caudata, Ag., is also associated 

 with T. Lusitanica. 



Other Cretaceous European Trigonia, not British, already figured, are : 

 Trigonia disparilis, d'Orb. Terr. Cret., 3, pi. 299, fig. 2. 



— limbata, d'Orb. Terr. Cret., 3, pi. 298. 



— Lamarkii, Matheron. Catal., pi. 24, figs. 5 — 7. 



— tenuisulcata, Dujard. Mem. Soc. Geol. Fr., t. 2, pi. 15, fig. 14. 



— excentrica, Goldf. Petref., 3, pi. 137. 



— pulchella, Reuss. Bohem., pi. 41, fig. 3. 



— scabra. Lam., d'Orb. Terr. Cret., pi. 296. 



— Coquandia?m, d'Orb. Terr. Cret., 3, pi. 294. 



— crenulata. Lam., d'Orb. Terr. Cret., 3, pi. 295. 



— divaricata, d'Orb. Terr. Cret., 3, pi. 288, figs. 2—4. 



— lo7}ga, Ag. Trigon., pi. 8, fig. 1. 



— Bobinaldina, d'Orb. Terr. Cret., 3, pi. 299, figs. I, 2. 



— paradoxa, Ag. Trigon., pi. 10, figs. 12, 13. 



— Delafossei, Lepnerie. Mem. Soc. Geol. Fr., 2 ser., t. 4, pi. 8. 



— Constanta, d'Orb. Terr. Cret., pi. 291, figs. 3, 4, vol. 3. 



— pahnata, Desh. Mem. Soc. Geol. Fr., vol. 5, pi. 8, fig. 5. 



— 7iodosa, Pictet and Roux. Gres Verts, pi. 35, fig. 5. 



— sandfB-crucis, Pictet. Paleont. Suisse, pi. 128, figs. 2 — 5. 



— nodosa, Pictet. Paleont. Suisse, pi. 12, figs. 1, 2. 



— Elisa, Cornet and Briart. Meule de Brecq., pi. 6, figs. 4, 5. 



