AUJ'.ia KEW SPECIES OF MOLLUSKS- — DALL 11 



Watson, especially on the base. It has been collected in 434 fa thorns 

 off St. Augustine, and in numerous other localities on the coast and 

 off the Keys of Florida, in 20 to 200 fathoms. 



WILLIAMIA MAGELLANICA, new species 



Shell minute, ovate conic, thin, greenish yellow with purplish radi- 

 ations, smooth, the apex prominent, briefly strongly incurved; lengtli, 

 4; breadth, 3; height, 1.5 mm. U. S. Nat. Miis. Cat. No. 198711. 



Two living specimens were collected on kelp by the United States 

 Bureau of Fisheries steamer Alhatrosft at Port Churruca, Magellan 

 Straits. 



This differs from the Antillean IF. Krebsii Morch, in darker color, 

 the presence of strongly marked radial color bands, smaller size and 

 more narrowly oval form. The apex also is more anterior, being in 

 the anterior third of the shell. 



LKPIDOPf.EURUS CAHINATl S. new species 



Shell rather large foi- the genus, yellowish white, densely covered 

 with minute pustules which are obscurely arranged concentrically to 

 the macro of the posterior valve, radially on the anterior valve and 

 longitudinally on the intermediate valves; back subcarinate, the 

 angle about 70°; eaves projecting, the insertion plates of the ter- 

 minal valves not split but radially rugose, of the intermediate valves 

 entire; girdle narrow, densely pilose, with extremely fine close minute 

 spiuules, with alternating darker and lighter patches; central, jugal 

 and lateral areas not defined; length in dry, curved condition about 35, 

 diameter, 9; height, 12 mm. U. S. Nat. Mus. Cat. No. 225149. 



Type specimen received from Eastport, Me., from Prof. A. E. Verrill ; 

 others from 12 fathoms in the Gulf of Maine, and from Oeorges Bank, 

 by one of the Gloucester fishermen. 



This species is intermediate between LepidopleurU'< and Hanleya. 



STEREOCHITON FKUPPONKI, new species 



Shell rather large, ivory white, dorsally subcarinate, doi'sal angle 

 about 90°; anterior valve with about 30 radiating widely spaced 

 threads and microscopic punctuation; posterior valve with low subcen- 

 tral mucro, behind sculjitured like the anterior valve, the central area 

 with minutely beaded longitudinal threads; intermediate valves with 

 the jugal tract not defined, the pleural areas longitudinally threaded, 

 the lateral areas with few obscure radial threads; the terminal valves 

 irregularly strongly copiously grooved, with shtting too obscure to 

 count, the intermediate valves with five or six slits; interior white, the 

 sinus and short sutural plates hardly differentiated; girdle brownish 

 with soft rather long silky hairs; length (dry), 50; width, 20; height, 

 10 mm. U. S. Nat. Mus." Cat. No. 333469. 



Mar del Plata, Argentina, received from Dr. F. Felippone. 



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