the Nomenclature of the Foraminifera. 293 



pi. xxiv. figs. 20, 21, certainly appears to be Bolivina dilatata. 

 Fig. 13, Or. jylatystigma^ is Bol. dilatata. Fig. 14, Poly- 

 inorphina asparagus^ is Virgulina squamosa'^ so also is fig. 15, 

 Grammostomum lingua. Fig. 16, Gr. macilentiim^ is a very 

 neatly Textilariiform V. squamosa (F. tegidata, Heuss). Fig. 

 17, Strophoconus effl,orescens^ is a rather twisted V. squamosa. 

 Fig. 18, Grammostomum {Polymorphina7) myoglossum^ is a 

 fragment of apparently a V. squamosa of regular growth. 



Figs. 19, Loxostomum subrostratum, and 20, Lox. rostratum^ 

 are varieties of Text, agglutinans, becoming Bigenerine (pass- 

 ing into Bigenerina) by the aperture getting more and more 

 terminal in successive chambers (fig. 20 shows the more ad- 

 vanced stage of the transition). Figs. 21 & 22, Lox. aculeatum^ 

 is a pouting Bigenerine Textilaria, tending towards Sagrina 

 rugosa, D'Orb. [Heterostomella, Reuss). The aperture is entire 

 (not ragged or prickly, as in the figures of some Polymorphince 

 in other plates), and lipped, as in Uvigerina. The edges of 

 the shell are aculeate by the production of the base of each 

 chamber. 



Fig. 23, Strophoconus poly morphus, = Virgulina Schreihersii. 

 Fig. 24, 8tr. spicula, = V. squamosa ; so also fig. 25, Gram- 

 mostoinum gracile. Figs. 26 & 28, Strophoconus poly moiphus, 

 and 27, Str, [Grammost.?] ovum?, are Virg. Schreihersii. 

 Fig. 29, Proroporus cretce, = Polymorpihina Thouini. FigS. 30 

 & 31, Grammohotrys? parisiensis, = Sphceroidi?ia hulloides', 

 and probably also 32, Pleurites cretm. Figs. 33 & 34, Sqjhce- 

 roidina parisiensis, = (33, probably and 34, certainly) Sph. 

 bulloides. Fig. 35, GuttuUna aculeata, and 36, Gut. turrita, 

 are Verneuilina pygmcea (Egger) ; but fig. 35 has the outer 

 margins of its chambers more or less aculeate, therein ap- 

 proaching V. spinulosa, Reuss. Fig. 37, Nonionina? ocellata, 

 is Cristellaria cultrata. 



Figs. 38-45 and 47 are various individuals of the neat little 

 variety of Planorhulina farcta known as PI. ammonoides 

 (Reuss), very common in the Chalk : thus figs. 38, a, b, 39, & 

 40, Planulina micromphala, ='■'■ PI. turgida, 1838, in part;" 

 ^^.A\,Pl.angusta] 4:2,a,b,Pl.annulosa', 43, Pl.leptostigma; 

 44 & 45, PI. ampla ; 47, PL ampliata. Fig. 46, PI. euomphala^ 

 is a slightly keeled Cristellaria cultrata. Fig. 48, PI. umhili- 

 cata, is Pulvinulina truncatulinoides (D'Orb.), seen from the 

 upper (flat) surface. Figs. 49 & ? 50, PL heteromphala, seem 

 to be small varieties of Planorbidina farcta, approaching PL 

 ( Truncatulina) lobatula ; such are not rare in the Chalk. It 

 is difiicult to correlate the many small Planorbulince, and Trun- 

 catulina', from the Chalk, figured by D'Orbigny, Reuss, and 

 Ehrenberg. 



