22 KDW'Altlt T. HltOWNK. 



ceiitrija't-il cniiala. The characters selected for the genus would make very ijood 

 specific characters. ('/n'linHa ini/ri/x'tnlls was found l)y Agassi/, in tlie (Inlf of 

 California. 



KuKI.LIKEHIA MAASI. 



(I'late IV., fig. 1-5.) 



Descriptiiiii oj tlw Species. — Umltrella very thick, a little higher than liroail, with 

 a rounded summit. Stomach fairly large, cross-shaped, and internally covered with 

 papilla'. Four oral tentacles, each of which is many times dichotomously hramheil. 

 Four liroad radial canals. Gonads separated perradially into four masses, which cover 

 very nearly the whole wall of the stomach. Eight groups (four perradial and four 

 iuterradial) of marginal tentacles, each group containing seven tentacles, of which the 

 central tentacle is the largest. Compound hasal hulhs of tlie tentacles very iiK^on- 

 spicuous. Ocelli absent. 



Size. — Umbrella up to •) mm. in width and 10 mm. in height. 



Descriptiiin of an lunii/ Stivje (Plate IV., fig. 1). Umbrella moderately thin, with- 

 out a mass of jelly above the stomach and slightly higher than broad. Stomach small 

 and cross-shaped, about one-third the length of the umbrellar cavity. Four oral 

 tentacles, each of which is 2-3 times dichotomously branched. Yonv fairly broad 

 radial canals. Eight groups of marginal tentacles, each group containing three 

 tentacles, of which the central one is the largest. Umlnella about 1 5 mm. in width. 



It is a pleasure to me to associate this new species with the name of Professor 

 Otto Maas. 



There are twenty-four specimens of this Medusa in the ' Discovery ' collection. 

 The specimens, especially the larger, were ditticult to examine, owing to the contraction 

 of the umbrellar margin and to its curling far up into the interior of the umbrellar 

 cavity. For the drawing (fig. 2) of the adult several specimens were used. Its 

 outline may not be quite correct when compared with a living specimen. It shows, 

 however, the characters of the species. 



The specimens were taken from May to December, 1903. As the early, 

 intermediate, and adult stages occurred during May, and different stages of develop- 

 ment during the other months, it is probal)le that the Ilydroid has no definite 

 breeding period. 



The stomach in transverse .section has the .shape of a cross, and is attached at 

 its base to the radial canals. Its intericu- is covered with minute endodcrmal 

 papilhe (O'l toO"3 mm. in length), which arc formed by outgrowths of the wall 

 of the stomach. A series of sections, from a specimen which happened to be in a 

 fair state of preservation, shows that the cells of the papilla3 are similar to those 

 which form the eudodermal wall of the stomach (fig. 5). Along the centre of the 

 papilla runs a slender strand of mcsoghwa, which is in continuation with the me.sogIa3a 

 between the ectoderm and endoderm in the wall of the stomach. 



