98 MAZATLAN BIVALVES 



interstices, which may belong to this species. 

 Hab. ? Mazatlan : in shell washings ; IS pool Col. 



139. LUCINA PMURICATA, Chemn. 



Tellina muricata, Chemn. Conch. Cab. xi. pi. 199, f. 1945-6, 

 Lucina rmiricata, Hve. Conch. Ic. pi. 8, f. 46. 



Tablet 467 contains a fragment, with extremely fine, close,. 

 radiating ribs, rising in concentric lines into sharp scales. 

 Sab. PMazatlau ; in shell washings ; L'pool CoL 



140. LUCINA EXCAVATA, n. s.. 



L. t. alba, tenui, complanatd; suborbiculari; striis concentricis 

 exillimis ; postice angulata, umbonibus incurvatis ; lunuld 

 parvd, alte excavatd; dent. card, et lot. haud magnis ; 

 impressionibus muscularibus postica ovali, anticd valde elonga- 

 td ; margine integro. 



Distinguished by the very small, most deeply cut lunule, 

 bounded on one side by the cardinal, on the other by the 

 anterior lateral tooth. A larger lunular portion is marked out 

 by a line, and the posterior margin is slightly bi-angulated. 

 Smallest valve '03 across. Largest, long. '38, lat. '41, alt. '12. 

 Hab. Mazatlan ; 2 valves and fragments among shell wash- 

 ings ; L'pool Col. 



Tablet 468 contains the two valves, and a fragment to shew 

 the external surface. 



141. LUCINA , sp. ind. 



Tablet 469 contains a fragment,, smooth outside, with the 

 umbo slightly projecting ; inside with a stout round cardinal 

 tooth, and deeply impressed internal ligament pit, I have a 

 very similar species from Port Jackson. 

 Hab. Mazatlan : in shell washings ; IS pool Col. 



142. LUCINA PECTINATA, n. s. 



L. t. albidd, suborbiculari, planatd, marginibus rotundatis ; 

 costis radiantibus appressis, hue et illuc bifidis,juniore circiter x- 

 adulta circiter xxx. ; postice non divaricatis ; lineis frequentis- 

 simis concentricis a costis undatis ; lunuld parvd ; dent, card* 

 et lat. haud magnis ; ligamento subintemo ; impressionibus 

 muscularibus postica subrotundatd, antica valde elongatd. 



