MAZATLAN BIVALVES 39 



with tlie surface indented may be an older form of tlie same 



species. Shell suborbicular, lateral teeth distinct. 



Sab. — Mazatlan ; from Spondylus washings ; L'pool Col. 



65. Tellina Bueneti, Brod. Sf Sow. 



Zool. Jouni. vol. iv, p. 362, t. 9, f. 2.— Hani. JDeser. Cat. p. 72, 

 t. 13, f. 51.— Hani, in Sow. Thes Conch, vol. i. p. 271. 



= Lucina cristata, Secluz, teste tTat/. 



After examining more than 300 specimens of this most 

 aberrant shell, I cannot quote any noteworthy variations. It 

 seems as though the creature was quite satisfied with its beauty, 

 without endeavouring to improve it. The valves however are 

 occasionally a little more bent, and the striae and knobs a 

 little more or less close. To the shape of a Myadora, it adds 

 the hinge of a Tellina. It has an Atlantic analogue, T. lunulata, 

 found fossil in the Pleistocene beds of S. Carolina. In this 

 however, the left and not the right valve is flat. A species of 

 similar form is found fossil in the palaeozoic rocks, agreeing 

 more with the Atlantic shell. (Woodw.) T. Burneti owes 

 its present wide distribution in collections to this importation 

 from Mazatlan : even this spring a specimen was sold at a 

 London sale for 15.?. Long. 1'23, lat. 1'37, alt. '23. 

 ^ai.— Found in the Estuary of Mazatlan, among the shoals 

 of large Pinnae which are left dry at low water, Lieut. Bel- 

 cher.— Salango, W.Columbia, Hanley. — St. Elena, Cuming. — 

 Gulf of Cahfornia, Mus. Cum.— W. Columbia, Lieut. Freer 

 in Bristol Museum.— Mazatlan ; not uncommon ; L'pool Col. 



Tablet 128 contains 3 specimens of difierent ages. 



Genus STKIGILLA, Turt. 



StrigiUa Turton, pars. Tellina, amt. A group of Tellinidsc 

 conveniently separated for their LucLna-like shape and di- 

 varicated sculpture. 



66. Steigilla (Tellina) caenaeia, Linn. 



Tellina carnaria, Linn. Si/st. Nat. ed. 12, p. \WS).—Donot\ Br. 

 Shells, vol. ii. pi. 47. — Linn. Trans, vol. viii. p. 57. — Dorset 

 Cat. p. 31, pi. 5, f 6.— Turf. Conch. Diet. p. 177.— Chemn. 

 Conch. Cab. vol. vi. p. 130, pi, 13, f \m.— Wood Ind. Test. 



