94 RKCORr>S OF THE AUSTRALIAN MTSF.rM. 



E. rulJt'iifiiil, E. rharrnfl, and E. htxhjfuiiii ai'e speeitical ly identical, and 

 explains awav the diffeienties between tliese species and tlie Kergueien 

 form by assuming that they are due to mistaken observations by Biowue 

 and Bedot made o.i iusnfficient material. On this basis he reduces all tlie 

 soutliei-n forms of crawling Medusa' to a single species and, together with 

 his own, refers them to EleutJu'rin rullfiitliii, Browne. 



Filially in 1919 Gilchrist found a crawling Medusa in fail- abundance 

 in a tank of the Government IMarine Laboiatory, neai' Cape Town, and on 

 search being made on the sea shore furlhei' specimens weie obtained fioiu 

 sea-weed collected at low tide. Gilchrist, moreover, ultimately succeeded 

 in tr-acing the Cape Medusa to tlie liydroid stage, which he observed in 

 one of his tanks in which the crawling Medusa had appeared in two 

 successive summers. The characters of both the medusa and the hydroid 

 stage disclosed the necessity for separating generically the southern from 

 the northern foi'ms; Gilchrist, therefoie, instituted the genus t'niihnienin, 

 with ( '. rapeiisp For its type, to accommodate the Cape species and pr(W)al)ly 

 the other southern species of crawling Medusa?. 



The discovery of yet another species of crawling Medusa Irom the 

 Southei'n Hemisphere is extremely interesting : a new species of ( 'iiidmifimi, 

 closely allied to ('. ca/iP)i!<p, lias now: been found to occur in Port Jackson, 

 Au St Italia. 



j\rAlEi;iAI, iNVKSTIiiATKI'. 



I am greatly indebted to Professor W. A. Haswell, Kmoritus Professor 

 of Zoologv in the University of Sy<lney, foi' the opportunity of examining 

 and describing this crawling Medusa fi'om Port .lackson. The material 

 placed at niv disposal consisted of twenty-seven Sf)ecimens which had been 

 fixed ill sublimate-acetic ami preserved in VO^'^ alcohol. Piofessoi Haswell 

 first observed the Medusa in Mar(di, 1917, while working over a collection 

 f)f sea-weeds obtained from the sides of a rock-hewn bathing pool at Point 

 Piper, a sandstone headland on tlie southern shore of Port Jackson, about 

 two and three-quarter miles from the entrance to the harbuut. 



In company with Professor Haswell I visited this locality on loth 

 September, 1919, and succeeded in obtaining twelve specimens which 

 served as a. basis for making obsei vations on the living animal. These were 

 examined in small pots in which llie sea water was changed each morning 

 and evening. This method was employed until 19th September, wiien ten 

 specimens were fixed in hot sublimate-acetic and the remainder tiansferred 

 to a glass vessel containing 150 c.c. of sea water. On '28th Septemliei-, 

 the Medusa^ were still alive though very sliiirgish in their movements, and 

 the pigmentation showed si<_rns of fading. 'Ihc sea water- had now evap- 

 orated to about one-half its original volume; in this conccni laied >oliitiiin 

 the specimens were kept under further observation until tith ()ctol)(M-, 

 when thev disintegrated after living twenty-six days without any food 

 having been added to the water. 



As a result of subsequent visits to the same Incality duiinir Octohci- 

 and November, additional specimens were procured including some which 

 were much youngei" tlian those pievicuisly found. 



