428 BULLETIN OF THE 



Dentalium ensiculus Jeffreys. 



Plate XXVII. Fig. 12. 



Dentalium ensiculus Jeffreys, Ann. Mag. Nat. Hist., p. 154, Feb., 1877 ; P. Z. S. 1882, 

 p. 660, pi. xlix. fig. 4. Watson, Chall. Gastr., p. 12, pi. ii. fig. 2, 1885. 



Dentalium didymum Watson, Journ. Linn. Soc, XIV. p. 517, 1879 ; Chall. Gastr., 

 p. 10, pi. i. fig. 11, 1885. 



Dentalium Sigsbeanum Dall, Bull. M. C. Z., IX. p. 38, 1881. 



Habitat. Yucatan Strait, 640 fms. Station 230, near St. Vincent, in 464 

 fms., temperature 41°. 5. Station 288, off Barbados, in 399 fms., bard bottom, 

 temperature 44°. 5. Also, by Dr. W. H. Rush, U. S. N., in 1060 fms., Yuca- 

 tan Strait, and off Havana, in 1024 fms., mud. North Atlantic, Portugal, West 

 of Ireland, Bay of Biscay, off Sombrero and Culebra Islands, West Indies, in 

 390 to 1785 fms., Jeffreys and Watson. 



A comparison of a full series renders the above consolidation evidently 

 necessary. 



Genus CADULUS Philippi. 



Cadulus Philippi, En. Moll. Sicilise, II. p. 208, pi. xxvii. fig. 21, 1844. 



The subdivisions of this genus are somewhat uncertain, owing to the prevail- 

 ing ignorance of the characters of the soft parts, and of the value for systematic 

 purposes of these differences where they are known. The type of the genus, 

 C. ovulum Philippi, is nearly related to C. obcsus Dall and C. gibbus Jeffreys, 

 but from these forms to the long and Dentalium-like forms, called Siphonoden- 

 talium by Sars, there is conchologically an insensible gradation. There is little 

 doubt that very different animals in some cases form these very similar shells, 

 but we are not yet in a position to make a final classification of them. 



Cadulus quadridentatus Dall. 



Plate XXVII. Fig. 5. 



Siphonodentalium quadridentatum Dall, Bull. M. C. Z., IX. p. 36, July, 1881. 



? Cadulus incisus Bush, Trans. Conn. Acad., VI. p. 471, pi. xlv. fig. 20, June, 1885. 



Habitat. Fernando Noronha, 7-25 fms. West coast of Florida, 30 fms. 

 Northward along the coast to Cape Hatteras, abundantly, in 12-50 fms., sand. 



I have not seen an author's specimen of Miss Bush's species, but the" species 

 described as above by me is quite abundant on the Carolina coast, and agrees 

 well with her description and figure. Most of the specimens have a slightly 

 dull silky look, with a slight yellowish tendency, as compared with the other 

 species, but this is not absolutely invariable, and may be due perhaps to the 

 action of the gastric juices of a fish upon specimens afterward disgorged. There 



