ACALEPII.E. 531 



minori, quam altera, tebraedra, apice rotundato ; lobis latis- 

 simis, cavitatis natatorial marginera superaiitibus ; cavitatc 

 nutritoria minima, processu posteriore petiolato, uiulto 

 majore, 



As Irish Acalephaj, there are noticed by Thompson 

 (Annals Nat. Hist, xiii, 1844, p. 440) Cydippe pileus, Meli- 

 certum campanulatnm, Aurelia aurita, bilobata, and Cyanea 

 Lamarckii. 



Physophora tetrasticha has been more particularly de- 

 scribed by Philippi. (Miiller's Arch. 1843, p. 58.) Four 

 rows of cartilaginous swimming-vesicles may be distin- 

 guished at its axis, beneath which is placed a double 

 circle of prehensile tentacles. The exterior tentacles, of 

 which there are from sixteen to twenty, are considered by 

 Philippi as true prehensile tentacles (Fangarme). The 

 interior tentacles consist of three portions, viz. : of a globose 

 base with granular contents, upon which is placed a ventri- 

 cose middle portion, with a narrow-pointed terminal piece. 

 From the basal portion of these tentacles filaments hang 

 down, which are beset with shortly-pedunculate, elliptical, 

 and spirally striated corpuscles. The hollow axis projecting 

 above the swimming-vesicles contains no air, and presents 

 inferiorly, among the tentacles, an aperture, which is pro- 

 bably the oral orifice. Moreover, among the tentacles 

 there are also some free cluster-shaped organs, of which a 

 short cluster is always associated with a long one ; they 

 probably represent an ovarium and testis. Philippi lias 

 also expressed himself with regard to the distinction of the 

 earlier species of Physophora described by Peron, Forskal, 

 and others. Kolliker (Froriep's n. Notiz. Nr. 534, p. 81) 

 has communicated his observations on the marginal bodies 

 of various Pulmograda, which have led him to regard the 

 corpuscles furnished with a pigment as analogous to the 

 eyes, and, on the other hand, those without pigment, to the 

 auditory organs. Hollard would be inclined to regard the 

 Acalepha? allied to Porpita and VeleHa as a small natural 

 family, or rather, perhaps, as a distinct order, and asks 



