78 BULLETIN OF THE 



from Panama. It is impossible to determine with certainty from Reeve's 

 figure whether his species is a true Ancistrosyrinx or not, but it looks like 

 one, and he expressly states that the apex is sharp and the sinus large, which 

 would exclude it from Columbarium^ to which Tryon referred it.* The latter 

 even considered it a synonym of the Chinese C. pagoda Lesson, which has a 

 bulbous nucleus and no sinus. A species from the Eocene of Dry Creek, 

 Jackson, Mississippi, was described by Mr. T. H. Aldrich in 1886 ; it is dis- 

 tinct from the recent forms, with which I compared it, having a different sculp- 

 ture about the sinus, and was named Pleurotoma (Ancistrosyrinx) columbaria by 

 Mr. Aldrich. The figures of F. calliope Brocchi and P. controversa Jan from 

 the Italian Tertiaries recall this group, but, if they are strictly to be relied 

 upon, the resemblance is superficial and consists chiefly in the dentate carina. 

 Nothing referable to this group was obtained by the Challenger. 



Ancistrosyrinx elegans Dall. 



Plate XXXVIII. Fig. 3. 



Ancistrosyrinx elegans Dall, Bull. M. C. Z., IX. p. 64, 1881. Agassiz, Three Cruises 

 of the Blake, IL p. 66, fig. 282, 1888. 



Habitat. Florida Reefs, Pourtales, 1870. Station 2, 805 fms., four miles 

 from Havana, Agassiz, 1877-78. 



In this species the anterior part of the whorls is covered with granulose 

 spirals, one more prominent than the rest in front of which the suture coils. 

 The sinus is comparatively short with a polished flat fasciole bounded outside 

 by an elevated strongly undulate keel, between which and the outer keel is 

 a narrow deep sulcus with n row of faint nodules at the bottom. The spines 

 are very small and curved toward the apex, the nucleus brownish, glassy, and 

 unicarinate. There are indications of very faint axially directed flammules of 

 pale yellow on the white surface. 



Ancistrosyrinx radiata n. s. 



Plate XII. Fig. 13. » 



Shell irregularly clouded with pale brown and white, or of a diffuse very 

 pale brown; nucleus of two whorls, the first very small, rounded, obliquely set 

 and partly immersed, arousing on casual inspection the unfounded suspicion 

 that it is sinistral; apex sharp, the subsequent whorls (nine or ten) at first 

 with a sharp dentate peripheral keel, which afterward becomes spinous and 

 more or less posteriorly directed; spiral sculpture anteriorly of numerous rather 

 widely separated fine threads, not granulose, but passing over rather coarse lines 

 of growth and less crowded near the keel; carina with, on the tenth whorl, 



* Since the above was written I have examined Reeve's type In the British 

 Museum, and it proves to be a species of Ancistrosyrinx, but different from the East 

 American forms. 



