SOME OBSERVATIONS ON ACINETARIA. 663 
Schroder, O.— Deutsche Siidpolar Expedition, Bd. 9, Heft v, 
“ Ophryodendron conicum.” 
Strethill Wright.—* Description of New Protozoan,” ‘Edin. Phil. 
Journ.,’ vol. 9, new series, p. 101, 1859. 
— “Observations on British Protozoa and Zoophytes,” ‘ Ann. and 
Mag. of Nat. Hist.,’ vol. viii, 3rd series, 1861. 
—— “On Ophryodendron abietinum,” ‘Quart. Journ. Micr. 
Sci.,’ vol. 1, new series, 1861. 
EXPLANATION OF PLATE 15, 
Tllustrating Mr. C. H. Martin’s “ Observations on Acinetaria.” 
Part 3.—“ The Dimorphism of Ophryodendron.” 
ABBREVIATIONS. 
C.e. Ciliate embryo. EH. M. Embryonic mass. Ma. Macronucleus. 
Mi. Micronucleus. Ne. Nematoblast. Ob. t. Obelia tentacle. Pr. Pro- 
boscis. Pr. I. Proboscidiform individual. Te. Tentacle. Ti. Tinctin- 
korper. V. B. Vermiform bud. V. I. Vermiform individual. 
PLATE 15. 
Ophryodendron abietinum. 
Fie. 1—Diagram showing proboscidiform with extended proboscis, 
some of the tentacles being attached to the tentacle of an Obbelia. 
(4 comp. oc. + 4 mm. apochr. Zeiss.) 
Fic. 2.—Details of the proboscis shown above; one nematocyst (Ne.) 
has just been dragged out of its position in the ectoderm. (6 comp. 
oc. + 2 mm. apochr.) 
Fie. 3.—Later stage of the feeding of a proboscidiform individual ; 
the proboscis is now retracted. Ne. = nematoblasts at the end of the 
tentacles. Ne!= a nematoblast on its way down the proboscis into the 
cytoplasm. Ne.?, Ne.2 = stages in the digestion of the nucleus of 
the nematoblast. (6 comp. oc. + 2 mm. apochr.) 
Fie. 4.—Proboscidiform which has just budded a vermiform individual 
on one side, and shows the beginning of a second vermiform bud on the 
other. (2 [Searcher] comp. oc. + 2 mm. apochr.) 
VOL. 53, PART 3.—NEW SERIES. 46 
