98 MAZATLAN BIVALVES 



iaterstices, wliicli may belong to this species. 

 Sab. — PMazatlan -. in shell washings; L'pool Col. 



139. LuciNA Pmueicata, Chemn. 



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

 Lucina muricata, Rve. Conch. Ic. pi. 8, f. 46. 



Tablet 4G7 contains a fragment, with extremely fine, close, 

 radiating ribs, rising in concentric lines into sharp scales. 

 Hah. — PMazatlau ; in shell washings ; L'pool Col. 



140. Lucina excavata, «. s. 



L. t. alba, tenui, complanafd ; suborbiculaH ; striis concentricis 

 exillimis ; postice angulata, timbonibics incurvatis ; lu7iuld 

 parvd, altc excavat a ; dent. card, et lat. hand magnis ; 

 impressionibits muscularibus postica ovali, antica valde elonga- 

 td ; warghie inteyro. 



Distingnished by the very small, most deeply cut lunula, 

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

 anterior lateral tooth. A larger lunular portion is marked out 

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

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



Huh. — 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 

 vei*y similar species from Port Jackson. 



Sab. — Mazatlan : in sheU washings ; L'pool Col. 



143. Lucina pectinata, n. s. 



L. t. alhldd, suborbiculari, planatd, marginibns rotutidatis ; 

 costis radlanfibns appressis, hue et illuc blfidis.juniore circiter x. 

 adiilld cirriter xxx. ; po.stiee nan divaricafis ; Uneis frcqtventis- 

 simis concentricis a costis undatis ; luniild parvd ; dent. card, 

 et lat. hand magnis ; ligamenfo stihinterno ; imprcssionibus 

 muscularibus postica subrotundatd, anlicd valde elongatd. 



