MUSEUM OF COMPARATIVE ZOOLOGY 205 



The deep-water species off the American coast would all appear to be refer- 

 able to Borcotropkon Fischer, with the exception of one of the species about to be 

 described. This presents in some respects such analogies with species of Murex 

 like M. hyutricina, that I have doubts as to whether the specimens I have seen 

 are fully adult, and whether they might not, when more mature, develop an 

 aperture of the muricoid type. For this reason I forbear to suggest any sectional 

 name for the form in question until more data shall have been obtained. 



The species known from the eastern coast (excluding the ordinary Arctic 

 forms) are few. They comprise T. vaginatus C. & J. (+ clavatus Sars); 

 T. abyssorum Verrill,* and the following species. All of them are closely 

 related, and the range of variation is not yet well determined. 



Boreotrophon (aculeatus Watson var.?) lacunellus n. s. 



Plate XV. Fig. 4. 



Shell solid, white, turrited, with about eight whorls, carrying each twelve 

 to fourteen slightly vaulted lamellae, which are angulated on the smaller whorls 

 at about the middle of their visible surface; nucleus smooth, white, with about 

 one and a half turns; subsequent coils sculptured only by the stout lamellae, 

 moderately strong lines of growth, and rather numerous irregular scratches or 

 ill-defined ridges directed in a spiral sense here and there on the shell. The 

 angulation of the (aperture and consequently of the) varices, though distinct, is 

 not sufficiently produced to form spines; suture distinct but not deep; posterior 

 surface of the whorls oblique, here and there slightly concave ; anterior surface 

 (or base) rounded, produced and prolonged into a slender canal somewhat 

 curved to the left ; aperture narrow, long, rather sharply angulated at the 

 suture, in front passing without any very marked constriction into the tapering 

 canal ; inner and outer lips reflected and connected over the body by a contin- 

 uous callus; the inner lip has a chink behind it at the beginning of the beak; 

 the outer portion of the reflection of the outer lip is angulated about one third 

 of the way from the suture toward the beak; the lips are polished, white, and 

 slightly thickened within. Max. Ion. of shell, 41.0 (?) ; of last whorl, 29.0 ; of 

 aperture, 24.5; lat. of shell, 15.5; of aperture, 7.5 mm. 



Habitat. Station 163, off Guadelupe, in 769 fms., sand, bottom tempera- 

 ture 39°. 75 F. 



I am in some doubt in regard to this shell, which presents several differences 

 from any of a number of closely allied forms, to none of which does it yet seem 

 quite safe to refer it. It is larger and has a longer and more even spire, less 

 angulated whorls, and angles much less produced, than in T. multilamellosus 

 Philippi. It is nearer T. clavatus of Sars, but still with similar differences, 



ciformis King, which he tried to quote, is probably a variety of T. Gerversianus ; but 

 owing to the confusion and doubt attending the specific name, it is probably better 

 to adopt that of Dr. Kobelt. 



* Trophon Lintoni Verrill strongly suggests Coralliophila rather than Trophon. 



