VO l889 U '] PROCEEDINGS OF THE NATIONAL MUSEUM. 333 



end of the axis; suture very deep. Longitude, 30; maximum latitude, 

 6.5 1 "" 1 . 



Hab. — Station 2678, off Cape Fear, in 7.'51 fathoms, light gray ooze; 

 bottom temperature, 38°. 7 F. 



The specimen procured was fresh, but without the soft parts. This 

 beautiful species somewhat resembles Verrili's figure of 8. Dalliana, 

 but is longer, much more cylindrical, and has strong spiral sculpture 

 which is wanting in that species. The upper fourth of 8. babylonia, 

 which would about correspond in size to 8. Dalliana, has the costa? 

 more sparse, thiu and erect, the whorls much rounder, and the .suture 

 much deeper than iu that species. None of the other species described 

 from deep water are much like it. 



Scala denticulata Sowerby. 

 Collected at Station 2702, east from Kio Janeiro, in 59 fathoms, mud. 



Genus ACLIS Lovou. 



Aclis nucleata Dull. 



Aclis nucleata Dall, Bull. Mas. Gump. Zool., xviu, p. 325, PI. xvm, Fi^. 7, June, 

 1889. 



First collected by the Blake at St. Vincent, West Indies; then by the 

 U. S. Fish Commission, in 201 fathoms, off Feruandina, Florida. The 

 Albatross still further extends the list of localities by adding Station 

 2750, off the island of St. Bartholomew, in 490 fathoms, sand ; tempera- 

 ture 44°.4 F. 



This last specimen is the finest yet found, and measures 17""" long by 

 4.S 11 "" in maximum diameter. 



Genus PERISTICHIA Dall. 



Peristiclna Dall, Bull. Mus. Comp. Zo6l., xvm, p. 339, 1889 



Shell elongated, acute, mauy-whorled, dextral, with a small, sinistral 

 nucleus, spirally or reticulately sculptured; aperture ovate, lips thick- 

 ened; columella straight, simple, without plaits, a basal cord entering 

 the aperture on the body between the pillar and the outer lip; aperture 

 anteriorly a little effuse, but not channeled in front of the pillar ; outer 

 lip varicoid in the adult, internally with a few very strong lirse ; suit 

 parts? 



Type, Peristichia toreta Dall. 



This genus has the spire, sculpture, and nucleus of Mathilda; the 

 basal cord is like that of Oscilla nicea; the outer lip, though less patu- 

 lous and more varicose, has something about it which recalls Rissoina. 

 It is like an Oscilla without columellar plaits, or like a Mathilda with a 

 thickened and internally Urate peritreme and rounded base. As far as 

 one may judge from the characters of the shell alone, this genus woidd 

 indicate the passage between Mathilda and Oscilla. 



