578 THE AMERICAN NATURALIST.  [Vou. XXXV. 
CLADONEMID&. 
A. Radial canals simple. 
1. Marginal tentacles two, fringed with stalked nematocysts, bell with 
subconical apical projection .-... % . s, a. )Gemmana 
2. Tentacles as in 1, bell hemispherical, without projection Corynitis 
B. Radial canals branched. 
Marginal ‘tentacles in eight pairs: "2 or ss 2 oe oe ave 
Coryne mirabilis Ag. (FIG. 33). 
Bell elongate hemispherical, four to six mm. in diameter; manubrium 
very long, protruding far beyond the velum, but highly contractile; tenta- 
cles likewise very long and filamentous, but capable of 
great contractility ; gonads borne upon body of manu- 
brium and at maturity filling 
entire bell cavity or even pro- 
truding beyond the velum. 
Fairly common during early 
spring and summer, swimming 
near the surface. Hydroid 
generation, — /dzd. 
Dipurena conica A. Ag. 
(FIG. 34). 
FIG. 33- FiG. 34. Bell conical or subhemi- 
Ss Neen ieee iN spherical; marginal tentacles 
Fic. 34. — Dipurena conica A. Ag. four nrathers shiek wand asin 
7 a 
knob-like ends, and with prominent basal bulbs, each with a single 
ocellus ; manubrium elongate, often extending beyond the velum, the basal 
portion constricted or narrowed, gastric cavity small, oral opening plain. 
Size from three to four mm. Common during midsummer. Buzzards Bay, 
Vineyard Sound, etc. 
McCrady (Proc. Elliott Soc., Vol. 1) describes from Charleston Harbor 
two other species of Dipurena, namely, D. strvangulata and D. cervicata, 
but I find no record of them as occurring elsewhere. 
Ectopleura ochracea A. Ag. (FIG. 35). 
Bell elongate hemispherical, of nearly uniform thickness, except at the 
aboral pole, which becomes somewhat conical and correspondingly thicker. 
In size the medusa varies from four to six mm. Marginal tentacles four, 
