108 BULLETIN" 11, UNITED STATES NATIONAL MUSEUM. 



Bagg records it from a single Albatross station near the Hawaiian 

 Islands, H4590, in 978 fathoms, rare. I have found specimens from 

 two North Pacific stations, Albatross D4979, off Japan, in 943 fath- 

 oms, and from Alert station 1156 in 2,046 fathoms south of Japan, 

 near the Bonin Islands. 



This seems to be a rare species and to occur in small numbers when 

 found. In its earlier development the chambers are somewhat less 

 flattened and of nearly equal height in the coil, but in the later devel- 

 opment the chambers become high and the last-formed chamber 

 in the adult is often much longer than any of the preceding ones. 



The specimen figured by Millett is not typical, the last-formed 

 chamber being of very different form from that usually seen in the 

 specimens I have examined. 



CRIBROSTOMOIDES, new genus. 



Haplophragmium H. B. Brady (part), Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, p. 307. 



Description. — Test free, planospiral, of several coils, chambered, 

 the last-formed coil with several chambers progressively increasing in 

 size, arenaceous wall, with much cement usually of a light-brown 

 color, aperture in young specimens a simple elongate slit at the 

 base of the apertural face, later subdivided by tooth-like processes, 

 and in the adult represented by a linear series of distinct rounded 

 openings. 



Type of genus. — Cribrostomoides bradyi, new species. 



This genus, while in general character is similar to HaplopTirag- 

 moides, differs very distinctly in the apertural characters and in their 

 development. 



CRIBROSTOMOIDES BRADYI, new species. 



Haplophragmium latidorsatum H. B. Brady (part), (not Bornemann), Rep. Voy. 

 Challenger, Zoology, vol. 9, 1884, p. 307, pi. 34, fig. 9.— Goes, Bull. Mus. Comp. 

 Zool., vol. 29, 1896, p. 29 (part). 



Description. — Test free, nautiloid, rotund, large, composed of seven 

 to nine rotund chambers in the outer visible coil, umbilicate on both 

 sides, wall composed of very fine arenaceous material with much 

 cement, surface smooth, even; in front view broad, chambers rather 

 low but broad, involute, aperture at first an elongate curved slit, 

 later with the growth of tooth-like projections from the two sides it 

 becomes subdivided so that in adult specimens the aperture is really 

 multiple, consisting of a linear series of rounded openings instead of 

 a single slit , color light grayish or yellowish brown. 



Diameter up to 3 mm. 



Distribution. — Specimens of this species were found in the Goes 

 collection, his series of specimens from Albatross station D3419 in 

 772 fathoms being all of this species, but labeled " Haplophragmium 

 latidorsatum.' '' In the same general region, the west coast of Mexico 



