CLASSIFICATION OF ACTINIARIA 545 
macrocnemes (in one case macrocnemes and some of an intermediate 
sort). 6. Never fewer than ten pairs of mesenteries, mesenteries all 
perfect (one exception). 7. Few mesenteries and tentacles—-up to 
forty or so. 8. No acontia. 
Hatcurtupar. Genera: Haleurias, Carlgrenia. Com- 
mon characters, 8. 
1. Definite base. 2. Spirocysts in ectoderm of body-wall nearly 
always. 3. No sphincter. 4. Tentacular longitudinal muscle ecto- 
dermal. 5. Only one siphonoglyphe. 6. After the first six pairs, 
mesenteries develop as directives and in endocoels. 7. There is 
a fairly sharp division between the first six or ten pairs and the rest, 
the former being macrocnemes and the latter more or less micro- 
cnemes; retractors of macrocnemes circumscribed. 8. No acontia. 
ACTINERNIDAE. Genera: Actinernus, Isactinernus, 
Synactinernus, Synhaleurias. Common char- 
acters, 10. 
1. Definite base. 2. Spirocysts in ectoderm of body-wall. 3. No 
sphincter. 4. Tentacular longitudinal muscle ectodermal (or with 
mesogloeal tendency in part). 5. Two siphonoglyphes. 6. After the 
first six pairs mesenteries develop as directives and in endocoels. 
7. No. division of mesenteries into macro- and microcnemes. 
8. Numerous perfect mesenteries. 9. Mesenterial musculature not 
strong. 10. No acontia. 
ConpyLaNnTHipAr. Genus: Condylanthus. Main char- 
acters, 7. 
1. Definite base. 2. No vesicles. 3. No sphincter. 4. Tentacular 
longitudinal muscle ectodermal. 5. Mesenteries divided into macro- 
and microcnemes. 6. Macrocnemes six pairs. 7. No acontia. 
Myonantuipak. Genera: Myonanthus, Macrodactyla, 
Boloceroides, Nevadne. Common characters, 7. 
1. Definite base. 2. No vesicles. 3. No mesogloeal_ sphincter 
(sphincter endodermal or absent). 4. Tentacular longitudinal muscle 
ectodermal. 5. Mesenteries not divided into macro- and microcnemes. 
6. Perfect mesenteries six pairs. 7. No acontia. 
ANDRESIDAE. Genus: Andresia. (One species only, 
see p. 518.) Main characters, 7. 
1. No base (correlated with very extensile body). 2. No vesicles. 
- 3. Small circumscribed endodermal sphincter. 4. Tentacular longi- 
