1861.] REV. H. B.TRISTRAM ON GUATEMALAN MOLLUSKS. 229 



No. 1 has 1 5 black rings on the body and 5 on the tail ; each ring 

 has an ill-defined yellow margin. The rings on the trunk occupy a 

 series of 8 scales (reckoned obliquely), and the intervals a series of 

 18. The rings on the tail occupy a series of 17 scales, and the inter- 

 vals 6. Ventral plates 211, caudal .53. 



No. 2 has 20 black rings on the trunk and 7 on the tail. Each 

 ring is edged with yellow, aud occupies a series of 6 scales, the inter- 

 vals occupying 1 1 . On the tail the black rings occupy a series of 

 10 scales, and the intervals 4. Ventral plates 215, caudal 60. 



No. 3 has 13 black rings on the trunk and 5 ou the tail. Each 

 ring is narrowly edged with yellow on the trunk ; each ring occupies 

 a seiies of 10 scales, and the intervals a series of 22. The rings on 

 the tail occupy a series of 20 and the intervals of 4 scales. In the 

 intervals each scale is tipped with a black spot, the spots being larger 

 on some scales than on others. Ventral plates 206, caudal 52. 



No. 4 has 1 7 black rings ou the trunk and 6 on the tail, without 

 yellow margins. Each ring occupies a series of 7 and the intervals 

 of 18 scales. On the tail the rings occupy 12 and the intervals 5 

 scales. Ventral plates 208, caudal 52. 



No. 5 has 20 black rings on the trunk and 8 on the tail. Each 

 ring occupies a series of 7 scales, and each interval, including the 

 yellow margins, which are clearly defined and occupy 2 scales, 

 15 scales. Each scale in the intervals clearly tipped with black, and 

 the ventral plates marked with irregular black spots. On the tail 

 each ring occupies 7^ scales, aud the intervals 5 scales. Ventral 

 plates 211, caudal 54. 



12. Crotalus horridus, Linn. 



One specimen nearly 4 ft. long, with three joints in the rattle. 



13. Hyla holochlora, Salvin, P. Z. S. 1860, p. 460, pi. 32. 

 f. 2. 



14. Emys venusta. Gray, Cat. Shield Rep. p. 24, pi. 12 a. 



A young example, in which the costal plates have a regular ring 

 of orange edged with a black margin, and a black spot in the centre. 

 On the dorsal plates this ring is interrupted, an orange stripe on 

 each side running in the direction of the back. These colours are 

 much more clearly defined and regular than in Emys ornata. 



5. Catalogue of a Collection of Terrestrial and Flu- 



VIATILE MoLLUSKS, MADE BY O. SaLVIN, EsQ., M.A., F.Z.S., 



IN Guatemala. By the Rev. H. B. Tristram, Corr. 

 Mem. Z. S. 



(Plate XXVI.) 



This collection consists of forty-nine species, of which sixteen appear 

 to be hitherto undescribed. The species collected by Mr. Salvin seem 

 to have a comparatively limited range ; for though a few are found 



