BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



show. There are certain forms which seem to occur with a definite 

 geographical distribution, and it may be that closer work with large 

 collections from various parts of the world will show more than one 

 species included under this name. Specimens from the western At- 

 lantic were well developed in the warmer waters of the Gulf of 

 Mexico and the Caribbean. Specimens were numerous in a collection 

 which I had sent me by Mr. Sidebottom from off the coast of Ice- 

 land, but they are different in certain characters from those of the 

 Gulf of Mexico. They seem to show that there is a difference in the 

 characters from widely separated regions. There seem to be very 

 few records for this species from about the British Isles. 



Lagena acuticosta — material examined. 



LAGENA ADVENA, ilew species. 



Plate 1, fig. 4. 



Lagena striata H. B. Brady (part) (not D'Orbigny), Rep. Voy. Challenger, 



Zoology, vol. 9, 1884, pi. 57, fig. 30.— Sidebottom (part), Journ. 



Quekett Micr. Club, vol. 11, 1912, p. 389, pi. 15, fig. 9. 

 Lagena striata (D'Orbigny), var. haidingeri Cushman (not Czjzek), Bull. 



71, U. S. Nat. Mus., pt. 3, 1913, p. 19, pi. 7, fig. 6 ; Bull. 100, U. S. Nat. 



Mus., vol. 4, 1921. p. 178. 



Description. — Test composed of two distinct parts, a globular body 

 and a polygonal tapering neck, the basal end of the test broadly 

 rounded with a few short, somewhat divergent spines, the main body 

 of the test superficially with numerous very closely set longitudinal 

 costae, which are -underlain by a layer with transverse lines, as is 

 shown by moistening the wall ; aperture at the end of a many-sided 

 pyramidal neck, the sides somewhat concave, the angles plate-like. 



Length, up to 0.55 mm. 



DiMrihution. — Type-specimen (U.S.N.M. Cat. No. 19042) from 

 Albatross station D2150, in 382 fathoms (697 meters) in the Carib- 

 bean. Brady figures this species, but I am unable to say where his 



