26 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



This species, as has been suggested by various authors, is more 



like Bolivina in some respects than like the other species of Textularia. 



I have left it in the latter genus for the present, not without some 



doubts. 



Both forms of the species are, so far as has been noted, without a 



coiled series of chambers in the early development of the test, a 



character which seems characteristic 

 of the microspheric form in most spe- 

 cies of Textularia. This would tend to 

 place the species as a highly specialized 

 one which in its acceleration of devel- 

 opment had skipped this stage in its 

 ontogeny even in the microspheric 

 form. 





k 





©' 



TEXTULARIOIDES, new genus. 



Description. — Test attached, consist- 

 ing of a Textularia-like series of cham- 

 bers, arranged in two series, the cham- 

 bers of one series alternating with those 

 of the other; wall arenaceous; aperture 

 an elongated slit in a depression at 

 the base of the inner margin of the 

 chamber. 



Type of the genus. — Textularioides 

 injlata, new species. 



This genus is closely related to Tex- 

 tularia, being mainly distinguished by 

 the attached habit and the consequent 

 changes in the structure of the test. 



Fig. 4.").— Textularioides inflata 

 a, front view; 6, end view 



X 30. 



TEXTULARIOIDES INFLATA, new species. 



Description. — Test attached, elon- 

 gate, slender, biserial, composed of 

 alternating series of chambers, each 

 slightly wider than high; sutures fairly 

 distinct; chambers inflated, margin 

 sinuous; wall coarsely arenaceous; 

 aperture an elongated slit in a depression at the ventral border of 

 the inner margin of the chamber. 

 Length 2.5 mm. 



Distribution. — This species was found attached to a fragment of 

 shell dredged by the Albatross at station D4900, in 139 fathoms, off 

 the coast of Japan. 



Type.— Cat. No. 8337, U.S.N.M. 



