932 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [6] 



radially from the vicinity of the coronal farrow to the abaxial points of 

 the marginal lobes. The coronal farrow is generally smooth, sometimes 

 with walls greenish in color, shallow. Immediately around the coronal 

 farrow is a rough undivided zone, inner corona, which forms the axial 

 region of the corona of the umbrella. The sixteen radial, coronal in- 

 cisions extend from this region along the middle of the marginal lobes 

 to the abaxial points of the same, alternating about the rim of the bell 

 with the tentacles and the marginal sense-bodies. 



By the arrangement of these incisions the base of each marginal lap- 

 pet or lobe is supported by two thickened gelatinous bodies, one side 

 (axial) of which is formed by the abaxial side walls of the coronal ditch, 

 M^iile the other fuses with thickened socles which sui^port the ten- 

 tacles and marginal sense-bodies. By their approximation near the free 

 (abaxial) end of the lobe they impart to that region a pointed form. A 

 thin naembrane skirts the margin of each marginal lobe, assuming the 

 form of a fringe. By the arrangement of the radial furrows, which are 

 found alternating with the tentacles and sense-bodies, it will be seen that 

 the coronal part of the umbrella is made up of sixteen gelatinous blocks, 

 shari)ly marked off from each other by the radial furrows or depres- 

 siims, and that these blocks are the thickened basal attachments or sap« 

 ports which bear the tentacles and the marginal sense-bodies. Four of 

 these socles carry sense-bodies; twelve bear the tentacles. There are 

 conse(piently three tentacles between the members of each pair of sense- 

 bodies. The marginal lappets, Avhen the auimal is alive, are probably 

 abaxially placed, acutely pointed, although more or less ragged in alco- 

 hol, on account of the rupture and distortion of the marginal membrane. 



The tentacles are long, stiffly extended, thick at base, which common- 

 ly bears on the external surface a characteristic inflation, not unlike 

 the warts mentioned on the exumbrella, reaching along the outer wall for 

 a few millimeters in length. In some specimens this inflation becomes 

 a globular sac of whitish color ; in others it has a chestnut-brown color. 

 The color of the tentacles in two specimens is a bright yellow, while 

 that of the peculiar enlargement or inflation of the wall near the base 

 of attachment is brown in these specimens. The constancy of this en- 

 largement of the base of the tentacle in this species, and its almost uni- 

 form absence in the transparent species {hyacinthina)^ has led me to re- 

 gard it as probably a specific character. It may, however, be of ab- 

 normal growth. The specimens are too imperfect forme to observe the 

 character of the sense-bodies, but they probably closel}' resemble the 

 same in P. hyacinthina, St. They are four in number, and prominent, 

 covered above by an extended lappet or hood. 



The subumbrella is made up of a central and a peripheral region, of 

 which the former is m holly occupied by the stomach. The sixteen ra- 

 dial grooves or farrows of the exumbral side of the corona are repre- 

 sented on the subumbral side by the same number of radial furrows in 

 the margin.d or coronal umbrella region. These furrows are rendered 



