MONOGRAPH OF THE EXISTING CEINOIDS. 



305 



Pterometra, Ptilometra (figs. 93, p. 153, and 361, p. 295) or Thalassometra (figs. 95, 

 p. 157, 96, p. 159, and 363, 364, p. 297). 



Though the ultimate results of these two processes of elongation of the cirri, 



FIG. 3S4. 



FIG. 3S5. 



FIG. 386. 



Fias. 384-386. 384, Cram FROM SPECIMENS OF LEPTOMETRA CELTICA TAKEN IN THE MDJCH, SHOWING THE VARIOUS TYPES (AFTEE 

 P. H. CAKPENTER). 385, CIRRI FROM SPECIMENS OF LEPTOMETRA CELTICA FROM OFT CAPE SAGRES, SHOWING THE VARIOUS 



TYPES (AFTER P. H. CARPENTER). 386, ClRRI FROM SPECIMENS OF LEPTOMETRA CELTICA FROM THE SEINE BANK, SHOWING 

 THE VARIOUS TYPES (AFTER P. II. CARPENTER). 



are very different in their appearance, the first giving elongate segments dlstally, 

 resembling those in the proximal portion, and the latter giving very short segments 

 distally, they are really the outcome of identical physiological or developmental 



