TAXONOMIC REVISION OF FORAMINIFERA IN MILLETT COLLECTION 



123 



tially a subglobular protoconch, followed by 4 pairs of 

 subglobular, biserial chambers, then abruptly uniserial with 3 

 cylindrical chambers. Aperture large, terminal and central 

 without everted border; the inner organic sheet closing the 

 aperture, however, develops around its circumference, 6 

 minute pores with tubular borders. Agglutinated wall of 

 granular, but overall smooth appearance. Tubular organic 

 pores have no counterpart in agglutinated phase. 



Dimensions (holotype). Height of test — 270 \xm; maxi- 

 mum width of test — 75 |im; diameter of aperture — 35 u.m; 

 diameters of tubular pores around circumference of aperture 

 — 4-5 \im. 



Paratypes. Two paratypes (BMNH nos. 1955.11.1.188,189) 

 are illustrated in Figs 5-8. In side view, they are as the 

 holotype with a short biserial stage followed by the uniserial 

 stage composed of 2 or 3 cylindrical chambers. Paratype 

 (BMNH no. 1955.11.1.188; Figs 6-8) shows an aperture 

 where the inner organic sheet does not close the opening. The 

 sheet itself has an opening, bordered by a thickened rim, 

 which is virtually of the same diameter as the rounded 

 terminal aperture of the agglutinated phase; there are no 

 minute pores as in the holotype. 



Dimensions (paratypes). (BMNH no. 1955.11.1.188) 

 Height of test — 230 [xm; maximum width — 90 urn; diam- 

 eter of aperture — 40 (am. 



(BMNH no. 1955.11.1.189) Height of test — 240 urn; 

 maximum width 75 um. 



Remarks. Millett's actual figured specimen (1900, pl.l, figs 

 la,b; reproduced here as Figs 2.1a,b) could not be recognised 

 with certainty. Millett's drawing, however, shows a specimen 

 with a rather indistinct biserial initial portion of 4 or 5 pairs of 

 chambers, then a 4 or 5-chambered uniserial stage; the 

 uniserial chambers are cylindrical and the large terminal 

 rounded aperture is devoid of an everted border. 



Environment. According to Millett (1900: 6), this species is 

 . . . 'confined to Station 9, and the examples, although 

 minute, are moderately abundant'. From the same locality 

 Millett (1899: 358,359) also found Acupeina triperforata, 

 Arenoparrella mexicana, 'Ammobaculites' exiguus, Ammoas- 

 tuta salsa and Ammotium spp., all brackish, mangrove 

 sediment-dwelling species. It is therefore assumed that T. 

 durrandi also lives in a brackish habitat. 



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