718 Scientific Proceedings, Royal Dublin Society. 
than the upper one-fourth. The longitudinal muscles of the 
primary mesenteries form well-marked swellings which are easily 
seen by the naked eye. 
Of the two specimens examined with the microscope, one (the 
smallest) was stained in borax-carmine, imbedded in paraffin, and 
cut transversely in series. The larger specimen was cut in two, 
the lower half was stained in carmine, and cut transversely, two 
portions of the upper half were also stained in carmine, and cut 
longitudinally. 
The transverse sections of the larger specimen, through the - 
gullet show two pairs of directives with four pairs of lateral com- - 
plete mesenteries, making six pairs of primary mesenteries. There 
are six pairs of secondaries bearing mesenterial filaments and 
acontia. ‘T'welve pairs of tertiaries without filaments, and three 
pairs of fourth-cycle mesenteries which do not project above the 
endoderm. Below the gullet, the number of mesenteries of the 
fourth cycle increases, and ovaries are found only on the primary 
mesenteries including the directives. 
Lower down, the number of fourth-cycle mesenteries is further 
increased. Mesenterial filaments and acontia are present along 
Fie. 2. 
Phellia Sollast.—The cesophageal region of Phellia Sollast.—The same below the cesopha- 
the large specimen. gus, showing gonads on primary mesenteries. 
with the gonads on the primary mesenteries. In the lower 
sections, the lateral primary mesenteries incline towards each 
other, but do not fuse. 
The small specimen is not so well preserved. It was pro- 
truding acontia through its mouth, and the gullet is everywhere 
