26 DR. E. HATJSLER ON SOME UPPER 



interesting varieties will be described and illustrated in this short 

 paper. 



Psammosph^ra FuscA, Schultze. Plate II. fig. 1. 



There occur in the oldest beds of the Argovian stage, and again 

 in the zone of A. bimammatus*, minute spherical bodies of a 

 coarsely arenaceous nature, without any large pseudopodial apertures, 

 which agree in their principal characters with Ps. fusca, Schultze. 



The cement is generally hyaline ; but in a few cases a light yellow 

 colour has been preserved. These spheres are very small, never 

 exceeding 0*6 mm., and composed of large grains of quartz-sand. 

 In the specimen figured, PL II. fig. 1, a part of the cement has 

 been removed with dilute hydrochloric acid. 



Before treatment with acids many arenaceous Foraminifera 

 (Psammosphcvra, ReojoJiax, Trochammina, &c.) are very difficult to 

 distinguish from grains of sand or fragments of other organic 

 remains, as they are' usually covered Avith a thin deposit of carbo- 

 nate of lime. 



Hyperammina yagans, Brady. Plate II. figs. 2-6. 



In the whole Middle and Upper Jurassic formation we meet fre- 

 quently with the large, tubular, finely arenaceous tests of this species. 

 Some free and attached forms have been erroneously described by 

 me as purely siliceous and externally corroded organic remains t. 

 The species is very variable as regards its external appearance, 

 being entirely free, fixed, or partly free, straight, irregularly bent or 

 twisted, sometimes spiral. The latter forms are always fixed. The 

 simplest specimens form a large bulbous chamber drawn out in a 

 long conical tube. H. vagans is the largest Jurassic Foraminifer, as 

 it reaches a total length of several millimetres when attached to 

 the stems of Crinoids, valves of Brachiopoda, &c. 



From the recent forms described by Brady + they differ very 

 little. 



Though generally of pure white colour, specimens of a brownish 

 colour are often met with. 



IIeophax mttltilocttlaris, sp. nov. 



Test long, slender, fragile, straight or irregularly bent, consisting 

 of 22-25 small segments separated by slight constrictions. Oldest 

 chambers broad, youngest oblong, rounded ; test built up of com- 

 paratively large grains of sand, firmly cemented by a colourless cal- 

 careous cement. Surface very rough. Length 1 mm. 



In its general outlines, R. multilocularis bears some resemblance 



* In a paper " Die Astrorhiziden und Lituoliden der Zone des Ammonites 

 bimammatus," Neues Jahrb. f. Min. &c. 1883, vol. i., several species have been 

 briefly described and figured, to show their identity with the forms from the 

 older zone of Amm. transversarius. 



t Hausler, Untersuch. iiber die micr. Struct, d. Aarg. Jurakalke, p. 25, 

 pi. i. figs. 16, 20, 52-54. 



| Brady, " Notes on some of theEeticularian Rhizopoda of the ' Challenger ' 

 Exp.," Micr. Journ. vol. xix. p. 14, pi. v. fig. 3. 



