530 REPORT ON ZOOLOGY, MDCCCXLIV. 



furnished the following diagnosis : hyalina ; appendicibus ven- 

 triculi, 12-16 cirris ammlatis, rigidis, albis, apice flavescen- 

 tibus. Will has also found reason to enlarge the diagnosis 

 for Cytceis tetrastycha, Esch., as thus : disco campanulato ; 

 ventriculo tubuloso, in margine fasciculis ccllularum urti- 

 cantium magnarum instructo; quatuor cirris marginalibus 

 crassis, annulatis, rigidis, albis. He has also added the 

 diagnosis of Cyt&is polystyla as a new species, thus : disco 

 campanulato, ventriculo tubuloso ; labiis fasciculis complu- 

 ribus cellularum urticantium iustructis ; cirris marginalibus 

 26, annulatis, rigidis, albis, apice fuscescentibus. Two new 

 Geryonice are described by him as follows : Geryonia pdlucida : 

 disco hyalino, subconico; glandulis generationis lanceolatis 

 quatuor ; ore quadrilobato ; cirris marginalibus 64, expansi- 

 libus ; and Geryonia planata : disco planiusculo, tenui ; ven- 

 triculo rubro, quadrilabiato ; glaudulis generationis rotundis, 

 quatuor ; cirris marginalibus undecim expansilibus, albis. 

 Thaumantias leucostyla is also described as new by Will : 

 disco tenui, planiusculo ; cirris marginalibus albis, annulatis ; 

 glandulis generationis rotundis ; vesiculis marginalibus in 

 basi cirrorum. Two species of Ephyra, observed by Will 

 near Trieste, and which differ essentially from the EpJi. 

 octolobata, Esch., he is inclined to regard as the immature 

 condition of a discoid Medusa, and the more so as the Eph. 

 octolobata has been pronounced by Sars to be a young 

 Medusa aurita. A Diphyes Kochii has been instituted by 

 Will, with the following diagnosis : cavitate ductus nutritorii 

 brevissima ; squamis processibus duobus, lanceolatis, erectis 

 pra3clitis ; ventriculis cirrisque albis. In the genus Ers&a 

 he has described three new species, viz. : Ers. pyramidahs, 

 parte corporis nutritoria, pyramidali, lobis duobus iurequalibus, 

 altero duplo longiore, truncato ; processu posteriore cavitatis 

 nutritoriae sessili, parvo ; Ers. truncata, ambabus corporis 

 partibus sequalibus, nutritoria rotundata, glabra, lobis bre- 

 vibus, subrequalibus, processu posteriore cavitatis nutritorise 

 petiolato, parte natatoria conoidea, rotundata, margine iiitc- 

 gerrimo ; and Ers. elonyata, parte corporis nutritoria triplo 



