1897.] s^oif-MAErfrE fauna of spitsbeugex, 799 



immediately extruded an egg; and this first led me to suspect that 

 the form was not an immature S. stylatus, but the adult of a 

 distinct species. On closer examination the mastax was distinctly 

 seen to be twice as long as broad, whereas in the larger species it 

 it rather broader than long. 



Whilst under the one-inch power the fleshy parts alone are 

 visible, and the animal appears to be extremely slender with an 

 almost pointed head ; and it is only when high powers are brought 

 to bear upon it, that its full resemblance to S. stylatus can be 

 appreciated. The lorica proves to be proportionately as ample as 

 in that species, and of much the same outline, bat is more deflexed 

 to cover the sides. It is exceedingly delicate and yields to every 

 movement. In the trough the animal is only to be detected by its 

 vivacity ; when still, it is scarcely to be distinguished even when 

 its position is known. It runs along very quickly with a series of 

 dashes, and if alarmed, either remains motionless or throws itself 

 into the most violent contortions. 



Of this interesting form I saw some 15 to 20 examples, but they 

 were exceedingly ditticult to catch, and as difficult to deal with 

 after isolation. I quite failed to get any sketch, but the particulars 

 given above are amply sufficient for its identification. 



25. COLURUS CAtTDATTJS, Ehr. 



A few examples seemed to agree best with Gosse's particulars 

 of this species. 



26. Metopidia lepadella, Ehr. 

 Two examples. 



The follo^ving works are specially referred to by figures after 

 names of authors, 



1. Bergendal, D. — " Zur Eotatorienfauna Gronlands." Kongl. 



Eysiografiska Salskapets Handlingar. Ny Edljd 1891-2, iii. 

 Sep. ed., Lund, 1892. 



2. Beyce, David. — " On the Macrotrachelous Callidinae." Journ. 



Quekett Micr. Club, v. (1892) p. 15. 



3. Betce, Datid. — " On the Adinetadse." Journ. Quek. Micr. 



Club, V. (1893) p. 146. 



4. Ehbenbeeg, C. G. — •" Das organische kleinste Leben iiber dem 



ewigen Schnee der hochsten Centralalpen." Monatsberichte 

 der Berl. Akad. der Wiss. p. 314(1853). 



5. Eheenberg, C. Gr. — Das unsichtbar wirkende Leben der Nord- 



polarzone : Die Zweite Deutsche JN'ordpolarfahrt in den 

 Jahren 1 869 und 1870. Band ii. Leipzig, 1874. 



6. Janson, Otto. — "Versuch einer Uebersicht iiber die Eotatorien- 



familie der Philodinaeen." Beilage zum XII. Bande der 

 Abhandl. des Naturwiss. Vereins zu Bremen, 1893. 



7. Milne, W. — " On the Defectiveness of the Eyespot as a means 



of generic distinction in the Philodiucea." Proc. Phil. Soc. 

 Q-lasgow, 1886. 



