Journal 



OF THE 



NEW-YORK MICROSCOPICAL SOCIETY. 



Vol. IV. JANUARY, 1888. No. 1. 



THE RADULA OF THE CONCH, SYCOTYPUS CAN- 

 ALICULATUS, GILL. v 



BY THE REV. J. L. ZABRISKIE. 



(Read November \Wi, 1887.) 



This species is, with one exception, the largest univalve mol- 

 lusk inhabiting the coast waters of our State. It is common 

 from the eastern borders of New England southward along the 

 shores of New Jersey. The exception in size occurs in the case 

 of Fulgur carica, Conr., a near relative, which is found from 

 Cape Cod southward along the shores of the Southern States. 

 The size of the adult shell of the first species is given as six 

 inches in length, and that of the second species as eight inches. 

 In the warmer waters of the South, this latter species is said to 

 grow much larger. Both species are popularly known as the 

 " Winkle," " Periwinkle," or " Conch." This latter name is preva- 

 lent among the dealers of the New York markets, where they 

 are sometimes offered for sale. 



These mollusks are now assigned to different genera, and are 



Explanation of Plate 10. 



Fig. 1.— Longitudinal-vertical section of the anterior portion of the Conch, Sycotypus 



canaliculatus. Gill, natural size ; /, surface of the foot ; m, the mantle ; 



*, one tentacle ; p, the proboscis ; s, the skeleton ; r, the radula ; rs, the 



radular sack. 

 Fig. 2.— a perspective view of the skeleton, with the radula divested of some of its 



mexnbranes, and elevated above its natural position ; natural size. 

 Fig. 3.— One row of teeth, from the median portion of the radula, enlarged 15 diameters. 

 Fig. 4.— One row of teeth with worn and broken points, from the distal end of the 



radula, enlarged 15 diameters. 

 Fig. 5.— One row of teeth, from the proximal end of the radula, enlarged 15 diameters. 



