jrom the Falkland Islands. 277 



'J'lAKA, Lesson (1837). 

 Tiara intermedia, sp. n. 



Umbrella bell-shaped, little broader than high, with a large 

 conical crown. 



Stomach broad and massive, with perradial lobes; about 

 half to two thirds the length of the umbrella-cavity. 



Mouth large, with four lips, and the margin slightly folded. 



Gonads on the sides of the perradial lobes of the stomach 

 and in small horizontal folds. 



Tentacles eight (four perradial and four interradial), and 

 eight adradial bulbs without tentacles. 



Ucellus on the outer side of every tentacular basal bulb and 

 the adradial bulbs. 



Size : up to 7 millim. in height (including the crown) and 

 5 millim. in width. 



Five specimens in the collection belonging to the early and 

 intermediate stages. The full-grown adult stage I believe 

 to be absent. 



The Falkland species has much larger ocelli, broader basal 

 bulbs, and a broader umbrella than Tiara jjileata at the same 

 stages, but the general resemblance is unco:nmonly close. 



Margelidae. 

 Dysmorphosa, Philippi (1842). 



^largelidaj with eight marginal tentacles (four perradial 

 and four interradial). Mouth with clusters of nematocysts or 

 with simple undivided oral tentacles having a terminal cluster 

 of nematocysts. 



Dysnxorjihosa tenuis, sp. n. 



Umbrella somewhat conical, with a slight constriction above 

 the subumbrella-cavity ; a little higher than broad. 



Stomach cubical and on a peduncle about as long as itself. 



Mouth with four lii)S, having lenninal clusters of nemato- 

 cysts. 



Medusa-buds upon the stomach, interradially situated. 

 (Gonads not yet developed.) 



Tentacles eight. 



Size : up to 2 millim. in height and 1^ millim. in width. 



The collection contains only two specimens. 



