656 
ZOOLOGICAL LITJCRATUIIE. 
ceptibly shortened, with wedge-shaped thick bracts one over the other j 
polypites at intervals, singly on the ventral side of the stem j the sting- 
ing-filaments suspended between the bracts on the ventral side. C. ri- 
(jidumy sp. nov., Ilackel, 1. o. p. 49, tab. 10. figs. 06-71. 
Iliickel details some remarkable experiments made on this species by cut- 
ting the larva into two, three, or four pieces, each of which developed or 
grow after a few days into ordinary larval forms. L. c. p. 78. 
Phijsophora. For its development see Ilackel, /. c. p. 17. The larva is 
traced from its exit from the egg j at its thirteenth day it resembles some- 
what the Hyhocodon prolifer of A. Agassiz. The species observed appears to 
be new, and is described, p. 87, as P. magnifica. 
Athoi'yhia. Ilackel describes its development (/. c. p. 88) as far as the 
seventeenth or eighteenth day. 
E/HIZOSTOMIDjE. 
0 
Hackel gives the following classification of the Rhizostomidse, 
I c. p. 509 
1. Mhizostomidce. Four genital pouches and four subgenital pores ; arn^s 
simple, unbranched, without tentacles, with numerous crisped foliations on 
the plaits and throughout the greater part of the length of the fastened- 
together sucking-combs ; eyes eight, four perradial (in the meridian of the 
four arm-roots) and four interradial (in the ineridian of the four genital spots). 
Genera Rhizostomay Stomolophusy StylonectcSy MastigiaSy Ilimcmtostomay Cato- 
stgluSy RliacopiluSy 2'oxoclytuSy MelUcea, Thysanostoma^ Rvagora. 
2. Leptdbraehidoi. Four genital pouches and four subgenital pores ; arms 
simple, unbranched, without tentacles, very long and thin, with only one tuft 
of border-plaits and sucking-knobs near their end j eyes eight (?). Genus 
Leptobrachia. 
3. CasstopejidcB. Eight genital pouches and eight subgenital pores ; arms 
without tentacles, forming an eight-rayed simple or double rosette of dendri- 
tic tufts around the oral centre j eyes eight. Genera Cassiopeja, Crossostoma, 
Stoinaster, Holigocladodes. 
4. Cepheidce. Four genital pouches and four subgenital pores j arms short, 
very complicated, with helved sucking-knobs between the terminal twigs of 
the tufts, and with long thin tentacles between them j eyes eight. Genera 
CepheUy Polyrrhiztty DiplopiluSy llidroticus, Cotylorhizay Phyllorhiza. 
6. PolyclonidcB. Four genital pouches and four subgenital pores j arms 
long, continuously dichotomously twigged, without helved sucking-knobs 
and without long tentacles j eyes twelve, four perradial (in both meridians of 
the four arm-roots) and eight adradial (on both sides of the former), but none 
interradial (i. e. in both meridians of the genital pores). Genera Polycloniay 
SalamiSy Homopneusis. 
6. CrambessidcB. A single, central, cross-shaped genital pouch over the 
stomach, and four subgenital pores ; arms long, simple, unbranched, without 
tentacles, with many long rows of numerous isolated, wrinkled, head-shaped 
sucking-knobs; eyes eight (four perradial and four interradial). Genus 
Crambessa. 
Crambessa tagi, gen. et spec, nov., Iliickel, 1. c. p. 511, Taf. 88 & 30, Fiver 
Tagus, between Lisbon and Belem, and found where the water is even brackisli. 
