120 



P.BRONNIMANN AND J.E. WHITTAKER 



pertinent features (size, chamber inflation and shape, aper- 

 ture, etc.) from Brady's deep water species Haplophragmium 

 (=Trochammina) nanum which was lectotypified, 

 redescribed and illustrated by Bronnimann & Whittaker 

 (1980: 177, figs 1-9). P. simplissima is highly variable in the 

 overall shape and outline of the test (see Bronnimann, 1979: 

 14, figs 6A-J), however it is usually less compressed axially 

 than Millett's specimens. 



Dimensions of figured specimen (BMNH no. 

 1955.11.1.1141). Maximum diameter — 370 um; minimum 

 diameter — 280 um; axial height (thickness) — 90 um. 



Environment. According to Millett (1899: 360), this species 

 ... 'is most abundant in Area 1'. It is a marginal marine 

 species and significantly, was not listed where true brackish 

 species such as Acupeina triperforata, Ammoastuta salsa, 

 Arenoparrella mexicana, etc. were recorded. 



Genus TREMATOPHRAGMOIDES Bronnimann & Keij, 

 1986 



Type species. Trematophragmoid.es bruneiensis Bronnimann 

 &Keij, 1986. 



Remarks. The genera Haplophragmoid.es, Cribrostomoides, 

 and Discammina are all superficially similar to Tremato- 

 phragmoides. Trematophragmoides Bronnimann & Keij is 

 slightly evolute and planispiral with 3 apertures per chamber: 

 a single primary equatorial interiomarginal aperture and one 

 on each side of the chamber, umbilically situated on the 

 suture and posteriorly directed. Haplophragmoides Cushman 

 (1910) is also planispiral but has only one aperture per 

 chamber. Cribrostomoides Cushman (1910) is usually invo- 

 lute, with streptospiral coiling initially, becoming planispiral 

 in the adult whorls; the aperture is a equatorial, single areal 

 slit (with lip) near the base of the septal face, becoming 

 subdivided into a linear series of openings in gerontic forms. 

 Discammina Lacroix (1932) is planispiral and slightly evolute, 

 has a low interiomarginal equatorial aperture and is said to 

 have an . . . interior divided by thin straight organic parti- 

 tions, not corresponding to the original apertural face and not 

 always reflected at the surface' (Loeblich & Tappan, 1987: 

 68). 



Trematophragmoides bruneiensis Bronnimann & Keij , 

 1986 Figs 1.8, 28-30 



1899 Haplophragmium compressum Goes; Millett: 359; pi. 



5, figs 8a-c {non Lituolina irregularis var. compressa 



Goes, 1882). 

 1986 Trematophragmoides bruneiensis Bronnimann & 



Keij: 16; pi. 1, fig. 1-10, pi. 2, figs 3-5, pi. 10, figs 

 1-3, text-fig. 1. 



Remarks. Bronnimann & Keij (1986) described from brack- 

 ish waters of Brunei, NW Borneo, a planispiral agglutinated 

 foraminifer with an interiomarginal and equatorial primary 

 aperture and two secondary lateral apertures per chamber. 

 The test shape is quite variable and the periphery, as seen in 

 edge view, can be broadly rounded or compressed, almost 

 subcarinate. Millett's roughly agglutinated species (1899, pi. 

 5, figs 8a-c; reproduced here as Fig. 1.8a-c), attributed by 

 him to Goes' species H. compressum, shows two lateral 

 openings and a single equatorial primary opening per cham- 

 ber, and is undoubtedly a Trematophragmoides. Our SEM 

 illustrations (Figs 28-30) show the same specimen as that 

 drawn by Millett. As the early radial sutures are indistinct, 

 the total number of chambers cannot be determined with 

 certainty; the final whorl, however, contains 6 chambers. The 

 lateral secondary apertures are well exhibited in Fig. 30 and 

 the equatorial primary aperture in Fig. 29. Although the 

 number of chambers in the final whorl is less than in the types 

 of T. bruneiensis, other features agree well and there is no 

 doubt that the two are one and the same. 



Dimensions of figured specimen (BMNH no. 

 1955.11.1.1136). Maximum diameter — 470 um; maximum 

 thickness (final chamber) — 200 pm. 



Environment. This species occurs only at Station 3. Millett 

 (1899) does not offer any information about its association 

 with other species, but from a study of his collection it can be 

 seen to occur with 'Haplophragmoides' wilberti. From this 

 information, Station 3 must have been a brackish locality. 



Genus TROCHAMMINA Parker & Jones, 1859 

 Type species. Nautilus inflatus Montagu, 1808. 



Trochammina? milletti sp.nov. 



Figs 1.10,22-24 



1899 Haplophragmium anceps Brady; Millett: 361, pi. 5, 

 figs 10a,b {non Brady, 1884). 



Diagnosis. Small conical, tightly-coiled Trochammina? with 

 three large subglobular chambers in the final whorl. 



Name. In honour of Fortescue William Millett. 



Holotype. BMNH no. 1955.11.1.1088. Illustrated in Figs 

 22,23. This may be the specimen figured by Millett (1899, pi. 

 5, figs 10a, b; reproduced here as Figs l.lOa.b). From Station 

 12, Area 1. 



Description (holotypes). Test free, dextrally coiled coni- 

 cal trochospire with pointed initial portion. Final volution 



Figs 45-47 Ammotium directum (Cushman & Bronnimann). Figs 45,46, Detail of aperture (X975 and X280, respectively). BMNH no. 



1955.11.1.1119; Fig. 47, Side view (X160). BMNH no. ZF4999, mangrove sediments, Bronnimann sample 93, Acupe, Brazil 

 Figs 48, 49, 51, 52 Ammotium subdirectum Warren. Figs 48,49, Side and edge views (X85). BMNH no. ZF 5000; Figs 51,52, Side and 



oblique-apertural views (X85 and 125, respectively). BMNH no. ZF 5001. Both from mangrove sediments, Bronnimann sample 93, Acupe, 



Brazil. 

 Figs 50, 53 Ammotium pseudocassis (Cushman & Bronnimann). Side view (X160) and separate specimen in clearing oil (X265). 



Bronnimann Collection, mangrove sediments, Guaratiba, Brazil. 

 Fig. 54 Ammotium morenoi (Acosta). Side view (X205). Bronnimann Collection, mangrove sediments, Guaratiba, Brazil. 

 Fig. 55 Ammotium distinctum (Cushman & Bronnimann). Side view in clearing oil (X330). Bronnimann Collection, sample 145, from 



Acupe, Brazil. 

 All from Millett Collection, Malay Archipelago, except where stated. 



