280 Mr. E. T. Browne on IIi/dromelu3(B 



with four or more lips or a fokled margin without clusters of 

 nematocysts. Gonads surrounding the stouiach and extending- 

 aloi g the lobes of the stomach. Tentacles .sim])le, evenly 

 distributed (not in groups) round the margin of the umbrella; 

 one tentacle 0|)posite the termination of every canal. 



WiLLiA, Forbes (184()). 



Williada3 with six or more radial canals, eac!i having one 

 or more lateral branches (youngest stage without branches), 

 all running to the margin of the umbrelhi. 



Willia mutabi/is, sj). n. 



Umbrella slightly conical in shape, with a broad round 

 summit, about as broad as high ; margin slightly inverted. 



Stomach small, with six to eight lobes. 



Mouth with a closely folded margin. 



Six or eight main radial canals, each with three or more 

 branches. 



Gonads surrounding the stomach and the lobes of the 

 stomach. 



Tentacles twenty-four or more. 



Size: up to 6 millim. in height and 6 millim. in width. 



The collection contains thirty-three specimens, showing 

 various stages in development. The specimens show so 

 much variability that the normal characteristics of the species 

 remain doubtful. 



LEPT0MEDUSJ3. 



Thaumantidae. 



Laodice, L. Agassiz (1862). 



Lacdxce pulchrtty sp. n. 



Un)brclla flatly curved, nearly twice as broad as high. 



Stomach very large, with four large perradial lobes ex- 

 tending nearly to the margin of the umbrella. 



Mouth with four large lips. 



Gonads extending from near the stomach to within a short 

 distance of the ring-canal, forming a series of short folds 

 along the lobes of the stomach. 



'Jentiules about fifty, without a basal spur. 



Cirri absent. 



Stnsory clubs (cordyli) generally three or four between 

 every two tentacles and ctich situated on u small bulb. 



