4A MAZATLAN BIVALVES 
atus, without seeing the slightest approach to these characters, 
I am obliged for the present to consider them specific. Size 
of the Mazatlan specimen ; Jong. °55, lat. °95, alt. °33. Ordin- 
ary size, as in D. carinatus. 
Hab.—Mazatlan ; 1 young specimen ; L’pool Col.* 
Tablet 139 contains this specimen, and two valves, probably 
from the Central American coast. 
73. DoNAX TRANSVERSUS, Sow. 
Tank. Cat. App. p. 4, no. 226.—Rve. Conch. Icon. pl. 6, sp. 36. 
Known from D. scalpellum, Gray, (Gulf of California) by 
the peculiar incurving of the anterior dorsal line; and by the 
character of the posterior area, which has at the margin one 
large and two small flexures, while the surface is covered with 
radiating strice, very finely and granularly serrated. Long. °56, 
Piel 34. alt. 53. 
Hab.—Mazatlan; extremely rare; teste R. Tyler, Hsq., who 
found a fresh valve concealed ina Chama from the L’pool 
Col. The other valve is nowhere to be found. 
Tablet 140 contains this valve, most kindly presented by 
Mr. Tyler. 
74. Donax asstmitis, Hanl. 
Proc. Zool. Soc. 1845, p.17.—C. B. Ad. Pan. Shells, p, 277. 
no. 454.— Rve. Conch. Icon. pl. 2, sp. 10. 
This species is used for food at Panama, where the natives 
scoop to its depth, and keeping to the same level find them in 
great abundance. (C. B. Ad.) Long. °92, lat. 1°36, alt. °51. 
Hab.—Panama, Mus. Cuming.—Do. very plentiful, a few inches 
deep in sand at 3-4ths tide level, C. B. Adams.—Mazatlan, 
Lieut. Green.—Mazatlan ; 1 valve only ; L’pool Col. 
Tablet 141 contains the solitary valve. 
75. Donax PUNCTATO-STRIATUS, Hanl. 
Proc. Zool. Soc., 1843, p. 5.—Rve. Conch. Icon. pl. 3, f. 16. 
Var.=D. radiatus Val. in Humb. Rec. vol. 11, 1833. 
?=D. flexuosus, Gould's plates. 
* An extremely similar shell is given in the Bristol Museum as Donax rugosus, 
Dy, Cutting, W. Indies. 
