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Show 1897.] NON-MARINE FAUNA OF SPITSBERGEN. 799 immediately extruded an egg; and this first led me to suspect that the form was not an immature S. stglatus, 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. stglatus can be appreciated. The lorica proves to be proportionately as ample as in that species, and of much the same outline, but is more defiexed to cover the sides. It is exceedingly delicate and yields to every movement. In the trough the auimal 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 difficult 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 CAUDATUS, Ehr. A few examples seemed to agree best with Gosse's particulars of this species. 26. METOPIDIA LEP AD ELLA, Ehr. Two examples. The following works are specially referred to by figures after names of authors. 1. B E R G E N D A L , D.-" Zur Botatorienfauna Gronlands." Kongl. Fysiografiska Salskapets Haudlingar. Nv Foljd 1891-2, iii. Sep. ed., Lund, 1892. 2. B R Y C E , D A V I D . - " O n the Macrotrachelous Callidinae." Journ. Quekett Micr. Club, v. (1892) p. 15. 3. B R Y C E , D A V I D . - " O n the Adinetadae." Journ. Quek. Micr. Club, v. (1893) p. 146. 4. E H R E N B E R G , C. G . - " Das organiscbe kleinste Leben liber dem ewigen Schnee der hochsten Centralalpen." Monatsberichte der Berl. Akad. der Wiss. p. 314(1853). 5. E H R E N B E R G , C. G.-Das unsichtbar wirkende Leben der Nord-polarzone: Die Zweite Deutsche Nordpolarfahrt in den Jahren 1869 und 1870. Band ii. Leipzig, 1874. 6. J A N S O N , OTTO.-"Versuch einer Uebersicht iiber die Botatorien-familie der Philodinaeen." Beilage zum XII. Bande der Abhandl. des Natur wiss. Vereins zu Bremen, 1893. 7. M I L N E , W . - " O n the Defectiveness of the Eyespot as a means of generic distinction iu the Philodinaea." Proc. Phil. Soc. Glasgow, 1886. |