98 MAZATLAN BIVALVES 
interstices, which may belong to this species. 
Hab.—? Mazatlan : in shell washings ;x Z’pool Col. 
139. Lucina 2? murtcata, Chemn. 
Tellina muricata, Chemn. Conch. Cab. xi. pl. 199, f. 1945-6. 
Lucina muricata, Rve. Conch. Ic. pl. 8, f. 46. 
Tablet 467 contains a fragment, with extremely fine, close,. 
radiating ribs, rising in concentric lines into sharp scales. 
Hab.—? Mazatlan ; in shell washings ; L’pool Col. 
140. Lucina EXCAVATA, 7. s. 
L. t. alba, tenui, complanatéd ; suborbiculart ; striis concentricis 
exillimis ; postice angulatd, umbonibus incurvatis; lunulé 
parva, alte excavatéd; dent. card. et lat. haud magnis ; 
impressionibus muscularibus posticd ovali, anticd valde elonga- 
ta; 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 aline, 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 ; L’pool Col. 
142. LucINA PECTINATA, %. S. 
L. t. albidé, suborbiculari, planatd, marginibus rotundatis ; 
costis radiantibus appressis, huc et illuc bifidis, juniore circiter x. 
adulté circiter xxx.; postice non divaricatis ; lineis frequentis- 
simis concentricis a costis undatis ; lunul&d parva ; dent. card. 
et lat. haud magnis ; ligamento subinterno ; impressionibus 
muscularibus posticad subrotundata, anticd valde elongata. 
