32 



SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY, 1!>19. 



rude incremental lines; anterior end shorter, 

 beaks rather pointed over a conspicuously de- 

 pressed but not sharply limited lunular area; 

 there is no escutcheon; a rather long nymph 

 supported an exteriial ligament under which in 

 one specimen in the left valve is an excavated 

 space having the aspect of the resilifer for a 

 rather large internal resilium; in front of this 

 is a single strong cardinal tooth with a well- 

 marked socket for a cardinal of the opposite 

 valve; the hinge of the right valve is deficient 

 in the specimen, but under the lumde there is 

 a rather well-marked lateral lamina; the pos- 

 terior end of the shell is rather bluntly rounded, 

 the base evenly arcuate; the muscular scars 

 are emphatically excavated, the inner valve 

 margins smooth. Proportions taken from the 

 mcremental lines of a fractm^ed specimen: 

 Height, 16 millimeters; length, 25 millimeters; 

 diameter, about 10 millimeters. The whole 

 specimen when entire must have had a height 

 of about 30 millimeters, and a length of more 

 than 37 millimeters. 



Station 7069. PHocene of Carter Creek, 

 stratum B, 80 feet below stratum A, and 100 

 yards east of station 7068. U. S. Nat. Mus. 

 catalogue No. 324304. 



The specimens of this species consist of tlu'ee 

 fragments, only one showing the entire hinge. 

 Tlie excavation resembling a resiliary pit is 

 probably the effect of erosion, in which case 

 the shell would be allotted to the genus Astarie. 

 At any rate the species can not be a typical 

 Crassatellites, on account of the well-marked 

 external ligament. Other specimens otherwise 

 similar have the hinge of Astarie, though the 

 teeth are more oblique and less triangular than 

 in most of the Recent species. 



Astarte leffingwelll Dall, n. sp. 



Plate VI, figures 6, 8. 



Shell of moderate size, with high pointed 

 prosocoelous beaks curving over a deeply exca- 

 vated, lanceolate lunule; anterior end shorter, 

 dorsal margin concave, below evenly rounded; 

 posterior dorsal margin nearly straight, de- 

 scending, with a short liganientary nymph and 

 a narrow escutcheon nearly thi-ee times as long 

 as the nymph; posterior end rounded, attenu- 

 ated, base evenly arcuate, with a smooth inner 

 margin; sculpture nearly smooth, under a lens 

 with faint concentric nairow undulations and 



very fine, even incremental lines; hmge com- 

 pressed, in the left valve with two thin and 

 prominent cardinals and a long, little elevated, 

 but distinct posterior lateral lamina ; muscular 

 scars excavated. Height, 25 millimeters; 

 length, 32 millimeters; diameter, 12.5 milli- 

 meters. 



Station 7228. Pliocene. In talus below low 

 bluff on the seacoast 15 miles southwest of 

 Point Barrow; collected by E, de K. Leffing- 

 well; U. S. Nat. Mus. catalogue No. 324305. 

 Also station 7067, about 30 miles southwest of 

 Point Barrow at Peard Bay; probably Pleisto- 

 cene ; collected by E. de K. LeffingweU. 



Astarte martini Dall, n. sp. 



Plate YI, figure 12. 



Shell small, ovate, with inconspicuous 

 pointed beaks, dorsal slopes straight, anterior 

 end rounded, shorter, base evenly arcuate, 

 posterior end slightly longer, attenuated and 

 almost obliquely trtmcated; a narrow elongate 

 escutcheon and shorter, narrower, slightly 

 excavated lunule present; sculpture of some- 

 what irregular, slightly raised, close set, con- 

 centric, narrow wavelets, becoming almost 

 lamellose near the edge of the lunule; and 

 in other sj^ecimens reduced to nairow threads 

 on the disk; hinge heavy, normal, muscular 

 impressions somewhat excavated, inner mar- 

 gm smooth. Height, 15 millimeters; length, 

 19 miDimeters; diameter, 10 millimeters. 

 A larger but defective valve is 25 millimeters 

 long. 



Station 7231. Phocene. Carter Creek. 

 Collected by E. de K. LeffingweU, 1012. V. S. 

 Nat. Mus. catalogue No. 324307. 



Astarte hemicymata Dall, n. sp. 



Plate VI, figures 9, 10. 



ShcU triangular, basaUy rounded, flatfish; 

 beaks narrow, high and pointed, prosocoelous; 

 lunule deeply excavated, lanceolate ; escutcheon 

 feebly defined, narrow, obscure; sculpture of 

 seven or eight broad concentric flatfish waves 

 with narrower shallow interspaces, obsolete 

 toward the base, and fine feeble incremental 

 lines; hinge compressed with (in tlic left valve 

 two) slender, somewhat arcuate teeth; muscu- 

 lar impressions moderately impressed; inner 

 margins of the valves smooth; anterior end 

 below the lunule evenly rounded into the base; 



