68 BULLETIN? 104, UNITJ^D STATES NATIONAL MUSEUM. 



rinthic; wall arenaceous; aperture in the adult consisting of a num- 

 ber of }3ores, the apertural face often bei oming sievelike. 



This genus may be: distinguished from Ammohaculites mainly in 

 the characteristic aperture, whi( h in its highest development becomes 

 sievelike', with numerous pores, while that of Ammohaculites is 

 simple. The tendency also in elongate spedmens is for an increase 

 in the size of the chambers as added, while in Ammohaculites the 

 size is usually fairly constant when once attained, except in A. 

 reophaci forn lis. 



The genus as used by Keuss has been variously applied until at 

 one time used for all the coiled, trochoid, or irregularly coiled tests 

 with coarse, arenaceous walls. It is here used in its original sense 

 as nearly as can be determined. 



HAPLOPHRAGMItftvi LITUOLINOIDEUM Goes. 



Plate 13, fig. 7. 



Haplophragmium lituolmoideum Goes, Bull. Mus. Comp. Zool., vol. 29, 1896, p. 32, 

 pi. 3, figs. 17-20. 



Descnjjtion. — Test elongate, subcylindrical or conical, the early 

 portion coiled, later portion uncoiled, uniserial, circular in transverse 

 section; chambers distinct, those of the uncoiled portion gradually 

 increasing in diameter, sutures distinct, slightly depressed; wall 

 coarsely arenaceous; aperture in me early portion single, in the 

 I'ater portion beoorhing multiple and in large specimens composed of a 

 considerable number of pores making a sievelike plate of the aper- 

 tural face of the, chamber; color gray or brown. 

 ' Length up to 3 mm. 



Distrihution.— Goes described this species from Alhatross stations 

 in the Gulf of Mexico at depths of 347-727 fathoms (635-1,330 

 ineters). There is one lot of mounted material in the Goes collection 

 and with that as a guide with tlie slightly conventionalized figure it 

 is possible to make out the species clearly. In the examination of 

 the Alhatross Ailantic dredgings it has been found to be well dis- 

 trributed alohg the Atlantic coast of the United States and in the 

 northern part of the Gulf of Mexico. Twenty stations are here 

 given ranging in depth from 390 to 1,735 fathoms (713 to 3,173 

 meters). 



It is evidently a Haplophragmium with its sievelike ajDerture and 

 Undivided chambers and can easily be distinguished from Ammohac- 

 ulites aggkitinans by the shape of the uncoiled portion which in A. 

 agglutina7is is cylindrical while that of //. lituolirioideum is decidedly 

 conical. The aperture will of course at once prove the distinguishing 

 character. 



