206 BULLETIN OF THE 



and is three times as large as T. clavaius, with nearly the same number of 

 whorls. It is most closely related to T. aculeatus Watson, from deep water off 

 Pernambuco, and I am disposed to consider them the same, though our shell 

 has fewer whorls in the same length and a proportionally longer canal. But 

 the types of T. aculeatus are evidently quite young. 



Younger specimens of what I suppose to be the same species have been taken 

 by the U. S. Fish Commission at Stations 2677, 2678, off Cape Fear, N. C, 

 in 478 and 731 fms., mud, bottom temperature 49°. 3 and 38°. 7. Also in 

 the Gulf of Mexico, at Station 2398, in 227 fms., mud, bottom temperature 

 48°.6 F. 



Boreotrophon actinophorus n. s. 



Plate XV. rig. 2. 



Shell translucent white, very thin, glass}'-, seven- whorled ; nucleus white, 

 smooth, two- whorled ; spiral sculpture of very fine faint irregular spiral lines; 

 transverse sculpture of the incremental lines and a keel or angulation at the 

 shoulder of the whorl which is produced into long nearly horizontally extended 

 triangular spines, deeply guttered out, and having the upper or posterior side 

 shorter in the direction of rotation than the other, so that looked at from the 

 apex the spines recall the paper whirligigs or wind-wheels used as children's 

 toys. There are six of these spines on the last whorl and thirty-one on the 

 whole shell figured. Spire elevated ; suture distinct, not channelled ; aperture 

 narrow, long, angulated at the spine, continuous wath the open canal which is 

 curved to the right; at the left of the canal projects a whorl of three or more 

 tips of antecedent canals (often broken away). Interior of aperture simple, not 

 thickened. Max. Ion. of shell, 17.5; of last whorl, 12.3; of aperture and canal, 

 10.0; max. lat. of aperture, 3.0; of the shell exclusive of spines, 6.0; of the 

 w^hole shell, 14.0 mm. 



Habitat. Station 134, off Santa Cruz, in 248 fms., sand; Station 206, off 

 Martinique, in 170 fms., sand; and Station 299, near Barbados, in 140 fms., 

 coral; temperatures from 49°. to 5G°.5 F. 



This is a very remarkable shell, and if immature, as I suspect, it is singular 

 that an adult was not taken at one of the three stations. Whether a Murex or 

 a TropJion it is entirely distinct from anything I have been able to find any 

 record of. It has in all respects the appearance of a truly abyssal species. 



Subgenus ASPELLA Morch. 



Aspdla Morch, Malak. Blatt., XXIV. p. 24, 1877. (No description.) 

 Poweria Monterosato, Nom. Gen. Conch. Medit., p. 113, 1884. Not Poweria Bona- 

 parte, Ichthyology, 1841. 

 Murex, Triton, Ranella, etc., Auct. var. 



The name suggested by Morch for Ranella anceps Lamarck, was not accom- 

 panied by any diagnosis or differential characters. There is, however, no reason 



