MAZATLAN BIVALVES 37 



process of Cumingia, but the ligament is scarcely apparent. 



Long. '06, lat. '07, alt. '04. 



Hab. Mazatlan : from Spondylus washings ; L'pool Col. 



Tablet 120 contains all that was found ; viz. 1 perfect valve 

 with a portion of the other. 



58. TELLINA LAMELLATA, n. s. 



T. t. " Tellince lira" simili, sed mag Is aqmlaterali, et carind 

 umbonum carente : lamellis acutissimis, irregulariter distanti- 

 bus ; umbonibus valde pro mine ntibus. 



A beautiful little shell, very flat, thin, white, transparent ; 

 cardinal and lateral teeth moderately strong ; spaces between 

 the lamellae smooth ; outline oval, very regular except where 

 the umbos project ; flexure wanting. It might have been the 

 young of T. lira, but for the entire absence of the stout umbonal 

 ridge of that species. Long. '1, lat. *13, alt. '03. 



Hab. Mazatlan ; nestling on back of Chamae and Spondylus 

 Lamarckii, extremely rare ; Lpool Col. 



Tablet 121 contains 1 pair and 2 opposite valves. 



59. TELLINA ??PUELLA, C. B. Ad. 



C. B. Ad. Pan Shells, p. 283, no. 468. 



Tablet 122 contains an open pair and a valve which may 

 belong to this species. I think however that the valve is dis- 

 tinct, and displays certain symptoms of Semele, of which I 

 have not seen th.^ very young shell, and am therefore, ignorant 

 of its variation in growth. An unfortunate cough made away 

 with the opposite valve, which however had previously adhered 

 by an external ligament. Whether there be an internal liga- 

 ment as well, repeated microscopic examination has as yet failed 

 to determine. Long. '075, lat. '095, alt. '035. 



60. TELLINA ?? DELICATULA, Desk. 



Proc. Zool. Soc. 1854, p. 363. 



Tablet 123 contains a fragment which may possibly be the 

 young of this exquisitely beautiful species. Mr. Cuming's 

 unique specimen displays, in addition to the features recorded 

 in Desh.'s description, a pretty general penciling of a dark 

 Sept. 1855. e 



