the Nomenclature of the Foraminifera. 193 



24. Planorbulina globulosa (^Aa-.). 



25. Pulviimlina Micheliniana (D^Orb.). 



26. squama [Ehr.). 



XVI. Foraminifera from the Chalk of Volsk, on the Volga, 

 Russia. (Ehrenberg, ' Das unsiclitbar wirkende organische 

 Leben,' 1842, p. 52.) 



PI. XXXI. figs. 1, a, 5-, c, Miliola sphoirula^ = Orhulina uni~ 

 versa. Figs. 2 & 3, M. paradoxa, and fig. 4, M. ovum^ appear 

 to be isolated chambers of Gloligerina. Fig. 5, M. kevis, is 

 the Lagena emaciata^ Reuss. Fig. 6, M. stiUgera^ is a Lagena, 

 exactly like a recent one we have from the Abrolhos Bank, 

 flat, elongato-lanceolate, and marginate, with a bimucronate 

 base, due to the wing-like ends of the keel on each edge ; ex- 

 cepting in the last-mentioned feature, it resembles fig. 46, 

 pi. xxix. Fig. 7, Vaginulina rotundata^ the first three chambers 

 of a strong simple Vaginidina like V. marginata, D'Orb. Fig. 

 8, Nodosaria monile^ is a rather thick-set N. ovicula. 



Fig. 9, Textilaria striata^ and fig. 10, T. sulcata"^ (" T.stri- 

 ataT''), are T. striata, Ehr. Fig. 11, Text, amjylior, and figs. 

 12 & 13, T. glohulosa ampliata, are T. glohidosa, Ehr. (small 

 arrested T.gibhosa). Figs. 14 & 15, Text, linearis, and fig. 16, 

 Grammostomum angulatum, are small specimens of T. agglu- 

 tinans. Fig. 17, Text, aculeata, is a coarse T. gihhosa with 

 apiculate chamber-walls, like fig. 20 a, pi. xxix., and figs. 12, 

 13, pi. XXX., = T. suhangulata, D'Orb. Figs. 18, 19, Gram, 

 7'ossicum, and fig. 20, Gr. secundarium (?), are various speci- 

 mens of Text, sagittula. Fig. 21, Gr. incrassatum, is a thick- 

 shelled Virgulina Schreibersii. Fig. 22, Gr. attenuatum, is 

 Bolivina dilatata with a strong shell. Figs. 23 & 24, a, h, c. 

 Gram, pachy derma, and fig. 25, Gr. thebaicum (?), are coarse- 

 shelled Virg. Schreibersii. Fig. 26, Gr.laxum (?), is Poly- 

 triorphina lactea. Fig. 27, Gr. megaloglossum, is a fragment of 

 a large Virgulina squamosa. 



Fig. 28, Sagrina cretce, represents a strong but somewhat 

 ill-grown individual of the pouting Bigenerina, with slightly 

 dentate chamber-margins, referred to Heterostomella aculeata 

 (pi. XXX. fig. 16) at page 189. Fig. 29, Loxostomum tumens, 

 is a fine, free-grown, smooth-shelled individual of the same 

 species. Fig. 30, Polymorjyhina acanthophora, and fig. 31, 

 P. obtusa, appear to be young Bigenerine specimens allied to the 

 last mentioned, but with longer and straighter flask-like cham- 

 bers, nearly parallel to the axis of the shell. A spike on the 

 base of the shell gives the name to the larger specimen j but 

 this feature is indicated on the other also. They nearly con- 

 form with B. [Gemmulina] digitata, D'Orb. 



