Introduction to Animal Morphology. io<> 



Cestidce, including the Venus' girdle (Cestum), with a long 

 stomach, and Vexillum with a larger funnel. 



4. Lobatce (Eschscholtz) body with a pair of antero- 

 posterior lobate processes ; ridges and ctenophoral canals of 

 unequal length. The families are: Eurhamphoeidae with 

 beak-like apical, lobate, oral pole and no tentacles ; Bolinidae 

 with rounded apical pole, small tentacles not in sacs, and 

 with the four shorter radial ridges in pairs, smooth on the 

 surface (Bolina), or papillose (Bolinopsis) ; Mnemiidae with 

 oral lobes separated from the lateral parts of the body by 

 grooves, and two of the radial canals ending in arabesque con- 

 volutions in the oral lobes. Eucharis and Chiajea are papillose,, 

 the others are smooth, with large (Mnemiopsis), or small 

 auricles (Mnemia, Lesueuria) ; Calymmidae with lobate pro- 

 cesses arising from the apical end, overlapping the oral end 

 as a mantle; Ocyroidae with forked lobes prolonged from 

 the apical end. 



The aberrant Sicyosoma (Gegenbaur), with no ctenophores 

 nor gastrovascular canals, but with nettle cells in the body 

 wall, may form a fifth order, or may be the young of Cestum 

 ;ssiz), or an Actinian larva (Krohti and Laickart}. 



CHAPTER XVIII. 

 CLASS 2. ACTINOZOA. 



KADI ATI-ID coelenterates with tentacles (Fig. 17, /) 

 round the mouth at the distal pole, and with a 

 ity separate from, suspended within, 

 and opening into, the body cavity (s), the portion of 

 which around the stomach peri\ i^crral space is di- 

 vid'-d into compartments by vertical, radiating, mem- 

 branous partitions, im-smtiTirs l-'itf. 17, /// , in \\hich 

 developed. Thus in tran-. 



