110 BRITISH FEESHWATEE EHIZOPODA. 



rather loosely arranged. The lower part of the test, 

 and especially the neck, in place of these, covered 

 Avith fine punctulations, which may be due to raised 

 points of the chitinous substance producing an 

 a,ppearance of roughness. Plasma, nucleus, and 

 pseudopodia as in the allied species. 



Dimensions : Length 190-220 /a. 



In Avet Sphn.t/nnm, not common. Dunham, Cheshire ; 

 Tan-y-Bwlch, Sychnant Pass, Llyn Idwal, and Towyn, 

 N. Wales. Above Dolgam, Capel Ourig, N. Wales; 

 and Killough, Co. Wicklow, Ireland (J. Hopldnson). 

 Loch Ness, Scotland {D. J. Scourfield). 





m&m 



Pio. 93.— Quadrangular scales on upper surface of test of Nebela 

 tuhulosa. X 400. 



This species may generally be recognized by the 

 chocolate colour of its test, and the lateral pores just 

 above the neck. These, however, are not the only 

 distinctive features. The minute punctulations on 

 the neck, and particularly for a short way upwards 

 from the mouth, are peculiar. The upper portion of 

 the test presents quite different features; it has a 

 surfacing of variously-formed scales, the outlines of 

 which are rendered somewhat indistinct by the sur- 

 face colour, but frequently we have been able to make 

 out an arrangement, just below the crown, of two or 

 three irregularly-disposed rows (following the outline 

 of the test) of quadrangular plates closely resem- 

 bling those of Quadrula, but rarely touching at their 

 edges. So closely do they resemble Qiuidrida scales 

 that the explanation suggests itself that they may be 

 the disintegrated remains of Quadrala tests which the 

 Nebela has appropriated for furnishing its own. 



