ACALEPH^E. 121 



Callianira PERON. Body lobate or supplied with lateral 

 wing's. 



Subgenera : EucJiaris ESCHSCH., Leucotkea MERTENS, Mnemia 

 * ESCH. (Alcinoe RANG), Lesueuria MILNE EDW., Calymma ESCHSCH. 

 (Ocyroe RANG), Callianira PEKON, ESCHSCH. 



In bringing these numerous genera together, and giving greater 

 extension to the name Callianira, than has been done by former 

 writers, my sole object is to facilitate the review, and at the 

 same time to indicate the affinity of these animals. Beyond doubt 

 the genera are too numerous here. The genus Buceplialon of 

 LESSON (Callianira bucephalon REYNAUD, LESS. Centur. zool. PL 28) 

 also belongs here, and probably does not differ from Calymma 

 Trevirani. 



Sp. Callianira hexagona ESCHSCH., Chilian. Slabberi DE HAAN, Natuur- 

 kundige Bijdragen II. 1827, pp. 150 152 ; this species has been con- 

 founded with Beroe hexayonus of BRUGUIERES (found at Madagascar). 

 In the genus Callianira proper, there are two filiform branched tentacles ; 

 the other subgenera have mostly four conical or triangular ciliated 

 tentacles. 



Cydippe ESCHSCH. (B&roe FEEMINVILLE, MERTENS.) Body 

 globose or ovate, with eight longitudinal, ciliated ribs. Tentacles 

 two, retractile within two subcutaneous vesicles. 



Sp. Cydippe pUeus, Beroe pileus MUELL., Volvox bicaudatus L. ; L. TH. 

 GRONOVIUS in Uitgezochte Verhandelingen Amsterd. 1758, in. p. 464, 

 PI. 26, f. i 5 ; BASTER Natuurk. Uitsp. i. PL xiv. fig. vi. vn. ; Cuv. R. 

 Ani. ed. ill., Zooph. PL 56, fig. 2, &c. (Since the vesicles, in which the 

 tentacles lie, open towards that extremity of the body which is opposite to 

 the mouth, the nervous ring (?) described by GRANT, cannot surround the 

 mouth, (see above, p. 104). The tentacles are able to lengthen themselves 

 greatly ; why ESCHSCHOLTZ describes them as indivisa, is not apparent ; at 

 least in most species they are much divided. 



J5) Stomach large. A circle of vessels (aqueducts) round the oral 

 aperture. 



Beroe ESCHSCH. (spec, of the genus Beroe GRONOV., MUELL. and 

 others) Idya FREMINV., OKEN, MERTENS. Body oval, ribbed, 

 with large circular aperture beneath. 



Sp. Beroe ovata BROWN, not. Hist, of Jamaica, PI. xiv. fig. i ; (this animal 

 was the first named Beroe ; LINN^US named it in the tenth edit, of the 

 Syst. Nat., Medusa Beroe, in the twelfth (1767) Volvox Beroe); Beroe 

 ForsTcalii, Medusa Beroe Forsk., MILNE EDW. Ann. des sc. not. i* s^rie, 

 Tom. xvi. Zool. PL 5, 6 ; Cuv. Regne Anim. ed. illustr., Zooph. PL 56, 

 fig. i, &c. 



