546 T. A. STEPHENSON 
tudinal muscle ectodermal. 5. Mesenteries not divided into macro- 
and microcnemes. 6. All mesenteries perfect. 7. No acontia. 
Tt has long tentacles in graded cycles. 
ActinupAE. Genera: Actinia, Anemonia, Gyro- 
stoma, Condylactis, Parantheopsis, Buno- 
dactis, Tealia, Epiactis, Isotealia, Bolo- 
cera, Leipsiceras, Boloceropsis, Dofleinia, 
Glyphostylum, Pseudophellia, Ixalactis. 
. Common characters, 6. 
1. Definite base. 2. No vesicles. 3. No mesogloeal sphincter 
(sphincter absent or endodermal). 4. Mesenteries not divided into 
macro- and microcnemes. 5. Numerous perfect mesenteries—at the 
least more than six pairs in adults. 6. No acontia. 
This is one of the few families in which the longitudinal muscle of the 
tentacles is sometimes mesogloeal. 
Anicimar. Genera: Alicia, Phyllodiscus. Common 
characters, 8. 
1. Definite base. 2. Vesicles present. 3. Body-wall delicate, 
divided into scapus and capitulum, the vesicles occurring either on 
the scapus or at and above its junction with the capitulum. 4. No 
mesogloeal sphincter, no developed sphincter at all. 5, Tentacular 
longitudinal muscle ectodermal. 6. Mesenteries not divided into 
macro- and microcnemes, 7. Six pairs of perfect mesenteries. 8. No 
acontia. 
PuyiiacTipaAr. Genera: Phyllactis, Cradactis, Phy- 
mactis, Cystiactis, Lebrunia, Bunodeopsis, 
Thaumactis. Common characters, 6. 
1. Definite base. 2. Vesicles present. 3. No mesoglocal sphincter 
(sphincter endodermal or absent). 4. Mesenteries not divided into 
macro- and microcnemes. 5. Numerous perfect mesenteries as a rule. 
6. No acontia. 
Here again tentacular longitudinal muscle may be ectodermal or 
mesogloeal. 
Minyapipan. Genus: Stichophora. Chief characters, 7. 
1. Base a float. 2. No vesicles. 3. Sphincter endodermal. 4. One 
siphonoglyphe. 5. Mesenteries not divided into macro- and micro- 
enemes. 6. Ten pairs of perfect mesenteries. 7. No acontia. 
