MEDUSAE. 171 



from the region of the apical sense organ to about two-thirds the distance 

 down the sides of the" animal, and end blindly. Eight rows of ciliated 

 plates follow the courses of the eight meridional canals and extend about 

 two-thirds of their length. Each of these rows contains about fifteen 

 combs of cilia. The lateral tentacles arise from the bottom of two deep, 

 narrow clefts, one in each side in the plane of the wide lateral diameter of 

 the animal. These clefts open quite high up on the sides not far from the 

 aboral pole, but their deep-lying portions extend downward to about one- 

 third of the distance from the mouth to the apex. The two lateral tentacles 

 are simple and quite thick, and no lateral tentacula were observed, although 

 a large number of specimens were examined. In this respect this species 

 differs from all other Pleurobrachiae. The mouth is a narrow slit. The 

 funnel canal and the radiating canals to the meridional vessels are straight 

 and slender. The entoderm of the stomach is of a decided yellow color and 

 the tentacles are slightly milky, all other parts of the animal being of a 

 glassy transparency. 



This Ctenophore was first obtained in N. lat. 31° 10', W. long. 125°. It 

 became rarer as we went southward, and disappeared before we reached the 

 Tropics. 



S rf ; Station 1 ; August 26, 1899; N. Lat. 31° 10', W. Long. 125°. 

 S''; " 6; " 31, " " 20° 26', " 133° 28'. 



Lampetia fusiformis, sp. nov. 

 Plate 13, figs. 59, 60. 



The animal is narrow and pear-shaped, and about 40 mm. in length. 

 The oral pole is long and narrow, and the aboral quite blunt. The body 

 is compressed laterally, the tentacular diameter being the longer. The 

 apical sense organ is half egg-shaped and contains a large mass of otoliths. 

 It is surrounded by raised ridges. The eight meridional canals arise from 

 the vicinity of the apical sense organs and extend about two-thirds the 

 distance down the sides of the body, where they end blindly. Each canal 

 is covered throughout its length with numerous (about forty) combs of 

 ciliated plates. The lateral tentacles arise from the bottom of long, nar- 

 row, tortuous clefts, which open upon the sides of the body about one- 



