56 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



Test of medium size, much compressed, complanate, opaque; 

 chambers numerous, curved; sutures distinct, the peripheral keel 

 distinct, central area somewhat enlarged in megalcspheric specimens, 

 the rest of the test marked by chains of beads along the sutures, the 

 intermediate areas smooth and unornamented. Diam.eter, up to 4 

 mm; thickness, 1.5 mm. 



D'Orbigny originally described this species from Rawack. I had 

 material from the Philippines and from Samoa which was referred to 

 this same species. D'Orbigny's original figure later published by 

 Fornasini shows a somewhat flattened test with beads along all the 

 sutures, and this form which we figured may be found to be distinct 

 when a study of d'Orbigny's types is made. The form figured has 

 occurred at the following localities in shoal water: Mokaujar 

 Anchorage, abundant; and 12 fathoms, Nairai, Fiji, comm.on. There 

 is a single specimen also from Albatross Station H3983, entrance to 

 South Pass, Rongelap, K mile north, in 400 fathoms, but this is small 

 and not well developed. 



OPERCULINA GRANULOSA (Leymerie) (?) 



Plates 14, 15; Plate 16, Figures 1-3 



As already noted, under this name have provisionally been placed 

 all those forms which have in their ornamentation beads or bosses on 

 the surface predominating either in part or in the whole specimen. 

 There is a considerable range of variation in these as w411 be seen by 

 the figures given. It has seemed best to make this disposal of this 

 series rather than to complicate the literature with names based upon 

 insufficient material or at least insufficient study. It ma}^ be re- 

 marked that the series from Rotonga has a very deep spiral suture, 

 and the chambers show no tendency to becoming elongate, while those 

 from Guam, for example, have the spiral suture very slightly depressed, 

 and later chambers tend to become flattened and more elongate. 

 Other localities show similar distinctive features, and it is probable 

 that several species are really represented in this rather wide area. 

 Specimens, except in one instance, are all from shoal water as follows: 

 12 fathoms off Levuka, Fiji; 3 fathoms. Viva Anchorage, Fiji; 12 and 

 24 fathoms off Nairai, Fiji; Mokaujar Anchorage, Fiji; 7 fathoms, 

 Rotonga; 18 fathoms, Vavau Anchorage, Tonga Islands; and 21 

 fathoms, Guam Anchorage, Ladrone Islands. There are a few speci- 

 mens from Albatross Station H3992, Schischmarev Pass, Wotje, 

 1 mile N., in 482 fathoms. 



Genus HETEROSTEGINA d'Orbigny, 1826 



Heterostegina d'Orbigny, Ann. Sci. Nat., vol. 7, p. 305, 1826. 



Genotype. — By designation, Heterostegina depressa d'Orbigny. 



