THE NAUTILUS. 



43 



Liicina californica Cour. 

 Lucina mittalli Cour. 

 Lucina tenuisculpta Cpr. 

 Diplodonta orbella Gld. 

 Lasea rubra Mont. 30 fathoms. 

 Lasea rubra Mont., var. sub- 



viridis Cpr. 30 fathoms;. 

 Kellia laperousii Desli. 

 Kellia suborbicularis Mont. 30 



fathoms. 

 Milneria minima Dall. 

 Lazaria subquadrala Cpr. 

 Area gradata Brod. 

 Mytilus californica Cour. 



Modiola (GregarieUa) opitex 



Say. 

 Septifer bifurcatus Rve. 

 Philobrya setosa Cpr. 30 



fathoms. 

 Lima orientalis Ad. & Rve. 



Young, dead. 30 fathoms. 

 Pecten latiauritus Conr. Young. 



30 fathoms. 

 Hinnites giganteus Gray. 30 



fathoms. 

 Monia foliata Brod. In Hinnites, 



30 fathoms. 



NEW SPECIES OF PACIFIC COAST SHELLS. 



liY WILLIAM HEALEY DALL. 



Trivia atomaria n. sp. Shell minute, of a livid pink, with a sub- 

 stratum of olivaceous cast, the whole giving a pinkish brown effect; 

 form subglobular, with a feeble dorsal sulcus, across which the ribs 

 usually pass without interruption ; in all there are about 18 ribs, 

 with about equal interspaces, which are slightly sagrinate or minu- 

 tely irregularly rugose, though the ribs ai'e smooth ; these ribs form 

 an equal number of fine denticulations on the inside of the outer lip 

 and over the pill;ir-li|) and internal lobe ; the extremities are very 

 sligiitly or not at all produced ; the spire is completely obscured. 

 Length 3.2, breatlth 2.G, height 2.2 mm. 



Half a dozen specimens of uniform size w<i'e dredged in 18 

 fathoms, Panama Bay, by the U. S. Str. AUiatross. Tiiis is tlie 

 smallest speeies I have seen; even the dwarfs of the allied T. sub- 

 rostrata Gi'ay of the West Indian fauna are larger. 



Trivia panamensis n. sp. Shell small, strongly scul|)tured, sub- 

 ovate, inflated, with its posterior extremity slightly produced; sculp- 

 tured with about 15 rather sharp-edged strong ribs, of which about 4 

 are intercalary and the others continuous over the shell ; in the 

 middle line of the back they dip slightly but are not interrupted or 

 attenuated ; aperture narrow, strongly and nearly equally toothed on 



