36 Bulletm Vanderhilt Marine Museum, Vol. VII 



recent records of this exquisite medusa are within the range of 

 the Humboldt Current. The gelatinous disk is a thick, plano- 

 convex, with a diameter equal to one-third of the total diameter. 

 Gastro- vascular system: The stomach is from one-third to one- 

 half of the total diameter of the medusa, well developed in both 

 specimens, although somewhat torn in the smaller specimen. The 

 lower gastric wall is well developed in the larger specimen, with 

 slight contraction, the mouth rather widely open. The lips, or 

 oral prominences, appear to be about one-third as many as there 

 are canals in the larger specimen. These vary in size, obviously 

 due to the degree of contraction existent, from approximately the 

 ratio Brandt (1838) illustrated in the type, to some slightly larger 

 and others, smaller. 



Canals : The canals of the larger specimen are shown in pi. 6 

 and are of comparatively one size. The majority of the canals of 

 the smaller specimen are moderately stout, approximately sub- 

 equal, with others quite slender ; there being no definite arrange- 

 ment nor alteration of different sizes, such as is represented in 

 Brandt's plate. In the present smaller specimen these canals show 

 as thick or thin, in ratio to the degree of contraction existent, in 

 part, and in part, to the position and light in which they are visible 

 through the gelatinous substance. Critical examination of the 

 uninjured canals show these to be approximately subequal. In the 

 larger specimen these radial canals are all about equal and show 

 in varying degree a puckered repetitional sinuate contour. The 

 gonads are well developed. 



OCTOCYSTS : These are very numerous, frequently double octo- 

 cysts occur ; all are closely crowded among the tentacles. 



Tentacles: These are almost entirely absent in the larger 

 specimen, which is imperfect marginally, except for a space of 

 about 12 millimeters width. About half of the circumf eral margin 

 is present in the smaller specimen where a fairly constant repeti- 

 tion of four to six tentacles per radial section between two canals 

 occurs ; these tentacles are of different sizes due to growth stages, 

 the longest ones not exceeding 18 millimeters in the contracted 

 state, the majority being 10 to 12 millimeters long; all are very 

 slender. The tentacular bulbs are long, laterally compressed, only 

 moderately dilated, of subovoidal form, or appearing in contour 

 as irregularly oval, more narrowed distally than proximally. Each 

 tentacular bulb communicates at the base on the inner side with 



