Bulletin 29 203 



nuclear whorls about eleven, the first eight being spirally striate 

 and delicately coronate, the last three are slightly channeled and 

 strongly striated spirally; body whorl roundly angulate at the 

 shoulder whence the sides slope convexly to the base, the orna- 

 mentation is limited to the lower two- thirds of the whorl and 

 consists of beautiful, granular, spiral threads, the granules resem- 

 bling the beads of a necklace ; margin of outer lip nearly straight ; 

 posterior sinus rather deep; canal nearly straight. Length of 

 largest shell 59, greatest width 33 mm. 



Dr. Dall most kindly examined this shell and noted that it 

 had no representative in the collection of the National Museum. 

 Apparently it is new. 



I take the greatest pleasure in naming this, our most ex- 

 quisite Cone, in honor of Mr. Arthur Sewall of Philadelphia as a 

 token of regard and gratitude for his encouragement and valu- 

 able help in assisting the progress of the Expedition. 



Localities. — (Exp'd '16) Bluff 1, Cercado de Mao; Zone E. 

 Rio Gurabo at Eos Quemados. 



Conus catenatus Sowerby 

 Plate 5, Figure 4; Plate 6, Figures 1, 2 



Conus catenatus Sowerby, Quart. Jour. Geol. Soc. London, vol. 6, p. 



45> P 1 - 9. fig- 2 i I 849. (Young shell). 

 Conus interstinctus Guppy, Quart. Jour. Geol. Soc, vol. 22, p. 288, pi. 



16, fig. 3, 1866. (Adult shell). 

 Conus catenatus Gabb, Trans. Aruer. Phil. Soc, vol. 15, p. 230, 1873. 

 Conus catenatus Gnppy, Quart. Jour. Geol. Soc, vol. 32, p. 527, 1876. 



Heneken's shell chanced to be very young and Sowerby 

 founded on it the species catenatus. Later Guppy described an 

 adult specimen from Jamaica as C. interstinctus. We have a 

 series of the following sizes: 30X15; 40X20; 57X27; 85X40 

 mm. The smallest of these is very like the original type figured 

 by Sowerby. The largest Dr. Dall kindly compared with the 

 type of Guppy' s interstinctus and found it to be identical. 



Localities. — (Exp'd '16) Zone A, Rio Gurabo at Los Que- 

 mados; Guayubin to Mao road at the ford of Rio Cana. 



