. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. 250 CCELEXTERATA. To these is usually added a funnel or umbrella-sliaped hydrophyl- Hum (fig. 192). These groups of individuals may in some Diphyids become free, and assume a separate existence as Eudoxia (fig. 193). The gonophores contain numerous ova in the manubrium, which often projects as a cone from tlie aperture of the bell. In the larva the upper nectocalyx is th^e first formed. Fam. Hippopodidae. The swimming cohimn has two rows of nectocalyccs, and is situate on an upper lateral branch of
. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. 250 CCELEXTERATA. To these is usually added a funnel or umbrella-sliaped hydrophyl- Hum (fig. 192). These groups of individuals may in some Diphyids become free, and assume a separate existence as Eudoxia (fig. 193). The gonophores contain numerous ova in the manubrium, which often projects as a cone from tlie aperture of the bell. In the larva the upper nectocalyx is th^e first formed. Fam. Hippopodidae. The swimming cohimn has two rows of nectocalyccs, and is situate on an upper lateral branch of the stem. The male and female gonophores are grouped in clusters and are situate at the base of the nutritive polyp. Gh'ha Hippojms Forsk., Mediterranean. Fam. Diphyidae. With two very lari^e nectocalyces at the. upper end of the stem and opposite to each other. Bipliyes acuminata Lkt., dicccious ; with Eudoxia campanulata. Ahyla jyentagona Esch., with Eudoxia cuboides, Mediterranean. Sjjhceronectes '±\.. = 3lonophyes Cls., Sp. f/racilis Cls. with LipJo- pJtijsa inermis, Mediteiranuan. (4) Sub-order: Discoidece. Stem compressed to a flat disc, with a system of canal-like spaces (.eutral cavity). Above lies the pneumatocyst in the form of a reservoir of car- tilaginous consistence composed of concentric canals opening to the exterior. The polypoid and medusoid appendages are situate on the under side of the disc. In the centre is a large nutritive Polyp, around which are a number of smaller ones. To tlie base of these small Polyps are attached the gonophores. The dactylozooids are not far from the edge of the disc. The gonophores are set free as small Medusce {Chry- somitra), Avhich do not produce the generative material till long after separation. Velulla S2)irans Esch., Mcditer-. i\ Fig. of a Di- phyd (after H. Leuck- art). D, Hydropliyl- lium ; GS, genital nectocalyx ; P, polyp with tentacles. The individual groups se- parate as Eudoxia. Fam. Vele
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanimals, bookyear1892
