200 BULLETIN OF THE 



Murex with Trophon. It has been called Paziella by one of those gentlemen 

 who employ themselves in inventing superfluous names for these animals. 

 He also called Murex zelandicus (which only differs from M. Pazi in 

 wanting the spines on the canal) Perrieria. I do not know which name is 

 prior, and neither of them are particularly worth retaining. Sowerby has 

 figured what seems to be a specimen of M. interserratus for this shell. No 

 figure of the genuine M. Pazi appears in the Thesaurus. The figure we give 

 is of the young shell dredged by the Blake. A fine specimen, 32 by 32 mm., 

 was afterward obtained from the Fish Commission. It differs from M. Crosse's 

 figure only in wanting the revolving lines on the base of the last whorl. 



Phyllonotus hystricinus Dall. 



Plate XV. Fig. 4. 



Shell yellowish white, thin, translucent when young, nine-whorled. Spire 

 pointed, turrited; nucleus white, smooth; remainder of the whorls with close- 

 set varices, crimped by the intersection of three principal posterior and several 

 smaller anterior spiral ribs, the largest being the most posterior and angulat- 

 ing the whorls. The ribs are prolonged on the varices into guttered recurved 

 spines, of which the posterior series is much the longest, the next pair smaller 

 and subequal, those in front much smaller and more recurved; there are nine 

 of these varices on the last whorl and more on the earlier whorls ; with each 

 varix a new canal is formed, much recurved, so that the base shows a vortex of 

 four radiating canal spines with a deep chink in their midst. The canal re- 

 mains always open; with this exception the margin of the aperture is con- 

 tinuous ; it is elevated, a little thickened and with three or four nodular 

 denticles in the adult within the outer lip. Max. Ion. of shell, 21.0; of last 

 whorl, 15.0; of aperture, 6.3; and of the canal, 8.5; max, lat. of aperture, 

 5.5; of shell, including spines, 16.5 mm. 



Habitat. Station 158, in 148 fms., rocky bottom, off Montserrat ; Station 

 206, off Martinique, living in 170 fms., sand, bottom temperature 49°.0 F. ; 

 also at U. S. Fish Commission Station 2134, south of Cuba, in 254 fms., 

 sand. 



This singular shell belongs to the group of M. carduus Broderip and fimbria- 

 tus Hinds (= luculentus Reeve). All of them might be or have been referred 

 to Trophon, where I should have placed them, except that the operculum is 

 typically Muricoid and the interior of the lip dentate. Multiply the series of 

 spines and varices on Murex Pazi and you will have a shell of this kind, which 

 is directly connected with Trophon, as far as shell characters go, by such species 

 as T. actinophorus. But no linear arrangement can express the relationship of 

 these groups or species. 



