MEDUSAE. 149 



very short, and there are six small, slightly crenulated lips. The tentacle 

 bulbs, genital organs, and proboscis are milky white, all other parts of the 

 medusa being transparent. A single specimen was obtained in a surface 

 haul about fifty miles north of Tahiti. 



Geryones mexicana, sp. nov. 



Plate 4, fig. 17. 



The bell is broad and pear-shaped and is about 5 mm. in diameter. The 

 gelatinous substance is very thick at the aboral pole, but becomes thin 

 near the bell-margin. There are six large, hollow, interradial tentacles, the 

 centrifugal sides of which are provided with wart-like nematocyst-bearing 

 swellings. There are also six slender, solid radial tentacles, each of which 

 arises from the side of the bell at a short distance above the margin. There 

 are six otocysts which are situated near the bases of the six interradial ten- 

 tacles. Each otocyst contains a single spherical otolith. The velum is well 

 developed. There are six straight radial canals which are wider near the 

 proboscis than they are near the circular vessel. The proboscis is short and 

 lacks a peduncle, and there are six slightly recurved lips. No gonads were 

 observed. The entoderm of the proboscis, radial canals, and interradial 

 tentacles is of a delicate pink. A single specimen of this medusa was 

 obtained in a surface haul off the coast of Mexico. 



S<*; Station 3 ; August 28, 1899 ; N. Lat. 26° 18', W. Long. 128° 54'. 



Carmaris rosea, sp. nov. 



Plate 4, fig. 18. 



The bell is hemispherical, and about 6 mm. in diameter. The gelati- 

 nous substance is thick at the aboral pole, but diminishes toward the bell- 

 margin, which is sharp-edged. There are twenty-four incisions, forming 

 twenty-four distinct lappets upon the bell-margin. Two lappets are situated 

 between each successive pair of tentacles. There are twelve tentacles. Six 

 of these, which are long, flexible, and hollow, are situated at the bases of 

 the six radial canals. These tentacles are thickly covered with rings of 

 nematocyst cells, and are about as long as the bell-diameter. The six other 



