no. 1820. NEW SH ELLS FROM BERMUDA— BALL AND BARTSCH. 287 



ISCHNOCHITON (STENOPLAX) BERMUDENSIS, new species. 



Animal narrow, elongate, with an evenly rounded back, prominent 

 mucro, narrow yellowish girdle articulated with reddish blotches, the 

 girdle scales very minute, imbricate, oval, radiately strongly striated ; 

 the surface of the girdle has a dusty look to the naked eye and required 

 high magnification to bring out the characters. Color dark crimson, 

 minutely and feebly mottled with small whitish blotches, interior dark 

 crimson, except the sutural plates which are whitish; eaves solid, 

 smooth; median plates with one lateral slit; anterior valve with 11, 

 posterior with 7-8 slits; jugum wide; lateral areas rounded, passing 

 without interruption into the median areas; anterior and posterior 

 valves and lateral areas sharply concentrically grooved ; the median 

 areas appear smooth, but under high magnification are seen to be 

 longitudinally sculptured with very narrow sharp grooves articulated 

 by little partitions; the lateral portions of the valves are minutely 

 granulose. The mucro is somewhat posterior to the center of the tail 

 valve and rather prominent. Length 11 mm., width 4 mm. 



This species belongs to the group of /. limaciformis from which it 

 differs by its minute sculpture, granulation, more prominent mucro, 

 and inconspicuous lateral areas; apparently also in color, though this 

 is quite variable in the limaciformis. The type is Cat. No. 223354. 



LIST OF SPECIES IDENTIFIED FROM BERMUDA. 



Haminea succinea Conrad, very young. 



Pleurobranchus, sp. ind. 



Mitra haycocki Dall and Bartsch. 



Mitra chelonia Reeve. ? (fragment). 



Mitra hanleyi Dohrn. 



Mitromorpha biplicata Dall, young. 



Cantharus massena Risso. 



Colubraria swiftii Try on. 



Columbella somersiana Dall and Bartsch. 



Aclis bermudensis Dall and Bartsch. 



Turbonilla ( Careliopsis) bermudensis Dall and Bartsch. 



Turbonilla (StriolurbonUla) peilei Dall and Bartsch. 



Turbonilla (StriolurbonUla) haycocli Dall and Bartsch. 



Odostomia ( Chrysallida) nioba Dall and Bartsch. 



Cymatium chlorostoma Lamarck. 



Cerithiopsis movilla Dall and Bartsch. 



Cerithiopsis ,ara Dall and Bartsch. 



Cerithiopsis pesa Dall and Bartsch. 



Cerithiopsis vicola Dall and Bartsch. 



Cerithiopsis io Dall and Bartsch. 



Alabina cerithidioides Dall. 



Alaba incerta OrbigDy. 



Alaba tervaricosa C. B. Adams. 



Rissoa caribaea Orbigny. 



Solarium krebsi Morch, young. 



Crepidula convexa Say, young. 



