ACALEPH.E. 529 



as a Beroc], in the following manner: corpore elliptico, compla- 

 nato ; tentaculis quatuor ciliatis ; lobis ad os duobus, corpore 

 paullo brevioribus, reniformibus ; verrucis expansilibus seri- 

 atim inter costas et in superficie loborum externa dispositis ; 

 colore fusco-rufescente. At the same time, Will mentions, as a 

 difference between Eucharis and Mnemia, that, in the former, 

 the integument is verrucose, and not in the latter ; the 

 Ciliograda, also, described by Mertens as Bolina, would 

 appear to belong partly to Eucharis and partly to Mnemia. 

 He describes Cydippe brevicostata as a new species, with the 

 following diagnosis : corpore oblongo-ovato, posteriore cor- 

 poris parte costis octo brevissimis prsedita, anteriore nuda ; 

 ciliis longissimis ; cirris ramosis albis ; colore griseo-albido. 

 The diagnosis, also, of Bero'e rufesceus, Forsk., has been thus 

 supplied by him : corpore ovato-oblongo, costis octo, quatuor 

 brevibus ; ore magno nudo ; appenclicibus ramosis ad anum ; 

 vasibus rubro-maculatis ; maculis sub epidermide flavido- 

 fuscis ; sanguine rubro. With reference to the luminosity 

 of the Ciliograda, Will remarks, that in a living Beroe ru- 

 fescens the costse are never luminous, and that, in this animal, 

 upon its being touched near the anus, a vivid spark of 

 yellowish-red light is given out ; but, on the other hand, 

 after death the whole substance of the Medusa, including 

 the costse, is luminous, but with a bluish-green light, a phe- 

 nomenon which always recurs upon the animal being shaken. 

 In Eucharis, Will noticed that the costaj also afforded a 

 bluish-green light upon forcible agitation of the water, or 

 touching ; on the first slight contact, a point near the anus 

 was also always illuminated. A dead Eucharis presented 

 precisely the same luminous phenomena as the Bero'e. 

 Will, moreover, does not believe that the luminosity of the 

 living Ciliograda is dependent upon the function of the 

 sexual organs. A new pulmograde Medusa, under the name 

 Cephea Wayneri, has been thus characterized by the same 

 naturalist : disci glabri centro prorninulo, fusco ; brachiis 

 bipartitis ; cirris inter brachia quatuor ; cotyledonibus aut 

 lacteis aut cferuleis. Of a new Polyxenia leucostyla he has 



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