EAST AMERICAN SCAPHOPOD MOLLUSKS. 



101 



1889. 



1897. 



sented by the Philadelphia Academy of Natural Sciences. These are 

 from the type lot. 



CADULUS (POLYSCHIDES) TETRODON Pilsbry and Sharp. 



Plate 17, fig. 5. 

 Cadulus amiantus Ball, Bull. Mus. Comp. Zool., vol. 18, p. 43, iu part and 



omitting figures. 

 Cadulus {Polyschides) tetrodon Pilsbry and Sharp, Tryon's Man. Conch., 

 vol. 17, p. 151, pi. 29, figs. 14-18. 

 The shell is small, slender and slightly curved; the convex side is 

 rather evenly arched; the concave side is straighter, with a slight 

 convexity at a point about one-third the total distance from the 

 aperture— the section of maximum caliber. This amounts to but a 

 slight swelling, from which the shell tapers gradually to the two ends. 

 The aperture is oblique, round and its peristome blunt and rounded. 

 The apex is cut by four slits, leaving four triangular lobes, the one on 

 the convex side being slightly longer and rounded, the lobe opposite 

 it broader and fiat-topped, while the two lateral lobes are smaUer. 

 The edges of aU these lobes are planed off or "beveled to an edge." 

 Measurements are: 



Length, 5.6 mm.; maximum diameter, 1 mm.; aperture, 0.6 mm.; 



apex, 0.35 to 0.43 mm. 



Length, 5 mm.; maximum diameter, 0.88 mm.; aperture, 0.6 mm.; 



apex, 0.4 mm. 



The type is in the Philadelphia Academy of Sciences collection, 

 Cat No 71070, coUected off Cape Florida, in 85 fathoms, by Comman- 

 der Kush. Topotypes, Cat. No. 84953, U.S.N.M., were given the 

 museum by Commander Rush. 



In some of the specimens an internal opaque caUous ring is observ- 

 able near the apex. This is asmaUer and more fusiform species than 

 Cadulus quadridentatus quadridentatus, but stouter than C. q. acomj)- 

 sus. Doctor DaU's C. amiantus belongs to another group. 



The following are the musemn records. 



Locality. 



Five miles oft Cape Florida 



Frying Pan Shoals, N. C 



do 



North side of Abaeo, Bahamas --;---■■ 



South Cat Cay, Bahamas, Eolis Station 47 . . . . 

 North Bimini Island, Bahamas, Eolis Station 50. . 

 Southeast of Fowey Light, Florida, Eolis Station 



108 

 One mile southeast of Fowey Light, Florida, 



Eolis Station 8. ^ ,. „^ ^. ^„ 



Caesars Creek Bank, Florida, Eolis Station 40 . . . 



Remarks. 



85 fms. (Doctor Rush). 



12* fms. (John Ford, collector). 



I2I fms. (C. W. Johnson). 



Owen Bryant. 



3 fms. 



20 fms. 



38 fms. 



25 fms. 



1§ fms. 



