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Show 1873.] MR. H. ADAMS ON LAND AND MARINE SHELLS. 209 genus is described as possessing an elongated lateral tooth, of which there is no trace in either of the species of Thyella. ANOMALOCARDIACRASSICOSTATA,Sp.nOV. (PlateXXIII. fig. 17-) A. testa transversa, subquadrilatera, ventricosa, costis radiantibus, elevatis, supra planatis ad 22 et lamellis plurimis concentricis cancellata, pallide fulva, fasciis fulvis inconspicuis ornata; extremitate antica arcuata ad marginem dorsalem angulata; extremitate postica oblique truncata; umbonibus antemedianis, tumidis, incurvis, distantibus; area cardinali lata. Long. 25, alt. 20, lat. 20 mill. Hab. Persian Gulf (coll. M'Andrew). Note.-In the first part of the 'Proceedings' for 1872, at page 12, I described a shell from the Isle of Bourbon under the name of Stylodonta (Erepta) bewsheri. Upon since referring to Ferussac's description of his Helix detecta, also from Bourbon, I have come to the conclusion that they are the same species. As H. detecta is the type of the subgenus Rotula, the subgenus Erepta must be restricted to H. stylodon and allied species ; while the very thin membranaceous shells, one of which, from Mauritius, was named by me Stylodonta (Rotula) cernica, appear to form a distinct subgenus, for which I would propose the name Caldwellia, and of which H. phillyrina, Morel., may be considered the type. I would add that the altitude of the shell above mentioned, H. detecta ( = bewsheri), which is stated in the description to be 18 mill., is 8 mill. I also take the opportunity of changing the name delicatula, given by me to a species of Scala, at page 272 of the 'Proceedings' for 1869, to that of tenera, as I find there is already a Scala delicatula of Crosse and Fischer. DESCRIPTION OF PLATE XXIII. Fig. 1. Coralliophila barclayana, p. 205. 2. Mitrella dcedala, p. 205. 3. Zafra purpurea, p. 206. 4. Odostomia carinata, p. 206. 5. Amphiperas pulchellus, p. 206. 6. Collonia munda, p. 206. 7. Liotia bellula, p. 206. 8. Cyclostrema carinatum, p. 207. 9. Clanculus pusillus, p. 207. 10. Minolia variabilis, p. 207. 11. Helix (Fruticicola) everetti, p. 207. 12. Bulimus (Drymceus) rawsonis, p. 208. 13. Corbula pygmcea, p. 208. 14. Tellidora pellyana, p. 208. 15. Thyella lamellosa, p. 208. 16. hargravesi, p. 208. 17. Anomalocardia crassicostata, p. 209. PROC. ZOOL. Soc-1873, No. XIV. 14 |