412 E. HERON-ALLEN AND A. EARLAND. 



patch extending down the middle of the shell. Magnification 



about 75 diameters. 



Plate 32. 



Technitella thompsoni, sp.n. 



The Moray Firth specimen viewed as an opaque object. Drawn 



by Mr. S. C. Akehurst. Magnification about 75 diameters. 



Plate 33. 



1. Astrorhiza limicola, Sandahl. x 6. 



2. ,, arenaria, Norman. x 9. 



3. Psammosphaerafiisca, Schulze, composed of sand grains, x 11. 



4. P.fusca, Schulze, composed of tests of foraminifera. x 11. 



Plate 34. 



5. Saccammina sphaerica, M. Sars. Group of 7 specimens, x 6. 

 5a. Two specimens from same group photographed to show 



internal roughness. 



6. Crithionina pisum, Goes. x 20. 



6a. Specimen of same laid open to show thickness of shell-wall. 



7. Crithionina pisum, Goes, var. hispida, Flint. x 20. 



8. Technitella thompsoni, sp. n. The Moray Firth specimen, x 17. 



9. „ melo, Norman. x 27. 



10. „ legumen, Norman. A broken specimen, showing 

 at the fractured extremity the outer layer of sponge spicules 

 embedded parallel to the long axis of shell. x 24. 



Plate 35. 



11. Marsipella cylindrica, Brady. Showing sponge spicules laid 



with a spiral twist. x 26. 



12. Ilaliphysema tumanoiviczii, Bowerbank. A colony of 



individuals attached to a Zoophyte. x 10. 



13. Psammosphaera fusca, Schulze, variety. x 38. 



14. Portion of tube of an Annelid, Amjihictene auricoma (Pec- 



tinaria). Spicules arranged in " bonded " layers. 



Note. — Since the above paper was written an interesting fact concerning 

 Technitella legumen has been brought to light by the accidental breaking 

 of a specimen. The shell is built up of two distinct layers. In the outer 

 layer the spicules are embedded in the mud so that the} 7 lie parallel to the 

 long axis of the test (Plate 34, Fig. ]0). In the inner laj'er, however, the 

 spicular fragments are much shorter, and are laid at right angles to the outer 

 layer, i.e. across the wall. This admirable arrangement obviously gives a 

 resistance to strain in two different directions. — A. E. 



The figures in Plates 33, 31, 35, are reproduced from direct photographs 

 of the original specimens taken by Mr. A. E. Smith. 



Journ. Quekett Microscopical Club, Ser. 2, Vol. A'., No. 64, April 1909. 



