44 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 ; long. '55, laf. *95, alt. 'Sd. Ordin- 

 ary size, as ia D. carinatus. 



Mab. — Mazatlan ; 1 young specimen ; L'pool Col.* 



Tablet 139 contains this specimen, and two valves, probably 

 from the Central American coast. 



73. DONAX TEANSVEESUS, Sow. 



Tank. Cat. App. p. 4, no. 226. — JRve. Conch. Icon. pi. 6, sp. 36. 

 Known from D. sealpeUum, G-rai/, (Gulf of CaUfomia) by 

 the peculiar iacurving 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 strise, very finelv and granularly serrated. Lo7ig. ' 56. 

 lat. 1-34, alt. 3. 



Hah. — ^lazatlan ; extremely rare ; teste It. Tyler, Esq., who 

 found a fresh valve concealed in a Chama from the L'pool 

 Col. The other valve is nowhere to be found. 



Tablet 140 contains this valve, most kindly presented bv 

 Mr. Tyler. 



74. DoNAX ASsiMiLis, Hani. 



Proc. Zool. Soc. 1845, p. 17.— C. B. Ad. Pan. ShelU, p, 277. 

 no. 454. — Rve. Conch. Icon. pi. 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. b\. 



Hah. — Panama, Mus. Cuming. — Do. very plentifid, 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-STEIATUS, Hani. 



Proc. Zool. Soc, 1S43, p. 5.— Eve. Conch. Icon. pi. 3, f. 16. 

 Var. = 'D. radiatus Val. in Humb. Sec. vol. ii, 1833. 

 ? = D. flcxuosus, Gould's plates. 



• An extremely similar shell is given in the Bristol Museum as Donax rugosns, 

 I>r. CuHing, W. Indies. 



