146 BULLETIN 111, UNITED STATES NATIONAL MUSEUM. 



CADULUS (CADULUS) OBESUS Watson. 



Plate 20, fig. 8. 



1879. Cadulus o6ems Watson, Journ. Linn. Soc. London, voL 14, pp. 527,. 528. 

 1881. Cadulus obesus, Dall, BulL Mus. Comp. ZooL, voL 9, p. 36, in part. 

 1885. Cadulus obesus Watson, Challenger Rept. (Scaphopoda), p. 22, pL 3, fig. 8. 

 1889. Cadulus obesus, Dall, BulL Mus. Comp. ZooL, vol. 18, p. 431, in part. 

 1898. Cadulus (Cadulus) obesus, FiLSBRY and f^n.KKF, Tryon's Man. Conch., vol. 

 17, p. 159, pi. 25. fig. 53. 



The shell is very small, short, inflated in the middle, narrowed at 

 both ends, but more so posteriorly, very slightly curved and a trifle 

 flattened. The convex outline is strongly arched and swollen cen- 

 trally with a straighter very rapid descent from the equator to the 

 anterior aperture. The "concave" outline is strongly bulged out 

 centrally and is very little concave at any ])oint and not at all so as a 

 whole. The anterior aperture is large and not oblique. The a])ical 

 orifice is smaller and has a callous ring within. The apical features 

 are described as ''chipped." Measurements are: 



Length, 2.7 mm.; diameter, 1 mm.; anterior aperture, 0.5 mm.; 

 apical aperture, 0.2 mm. (Watson). 



The ty])e is in the British Museum and is from the ChaUenger Sta- 

 tion 24 off Culebra Island, in 390 fathoms, bottom of Pteropod ooze. 



The only museum lot referable to this species is one of 20 speci- 

 mens, Cat^ No. 108171, U. S. N M., dredged by the Albatross at the 

 U. S. B. F. Station 2668, off Fernandina, Florida, in 294 fathoms, bot- 

 tom of gray sand, temperature 46.3°. Doctor Dall refers to this spe- 

 cies a lot from the United States Coast Survey Station 20, off Bahia 

 Honda, in 200 fathoms. It is in the Museum of Comparative Zoology 

 collection. The shells differ from Doctor Watson's C. exiguus only 

 in size, the relative proportions being substantially the same. 



CADULUS (CADULUS) CUCURBITUS Dall. 



Plate 20, fig. 1. 



1881. Cadulus cucurbitus Dall, Bull. Mus. Comp. ZooL, vol. 9. p. 35. 



1889. Cadulus cucurbitus Dall, Bull. Mus. Comp. ZooL, vol. 18, p. 431, pL 27, 



fig. 12 (d). 

 1889. Cadulus cucurbitus Dall, BulL 37, U. S. Nat. Mus., p. 78, pi. 27, fig. 12 (>/). 

 1898. Cadulus (Cadulus) cucurbitus, Pilsbry and Sharp, Tryon's Man. Conch., 



vol. 17, p. IGl, pi. 25, fig. 54. 

 1903. Cadulus cucurbitus Dall, Bull, 37, U. S. Nat. Mus., p. 78, pi. 27, fig. 12 {d). 



This little Cadulus was decribed by Doctor Dall from a single 

 specimen by comj^aring it with C. ohcsus Watson and C. tumidosus 

 Jeffreys, between which it occupies an intermediate position. As 

 authentic exam])les of these two .species used for reference are not 

 readily available a supplemental descrij)tion m.ay be of service. 



The shell is small, obese, w^ith its equator about median or sliglitly 

 posterior. The cylinder is round, at no point flattened. The convex 

 side is strongly arched with a slight concavity just forward of tlie 



