. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Dlazona vlolacea, magnified. (After Savigny.) circumscription ; animals sometimes scat- tered, sometimes arranged in a quincunx ; branchial orifice circular, without distinct rays ; anal orifice very minute and indistinct ; abdominal viscera pushed up by the side of the thorax. Genus Leptoclinum, Milne-Edwards.—Com- mon body sometimes coriaceous, sometimes gelatinous, thin, sessile and incrusting ; sys- tems few ; individuals arranged irregularly around common cloacal cavities; abdomen peduncled, short, smaller than the
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Dlazona vlolacea, magnified. (After Savigny.) circumscription ; animals sometimes scat- tered, sometimes arranged in a quincunx ; branchial orifice circular, without distinct rays ; anal orifice very minute and indistinct ; abdominal viscera pushed up by the side of the thorax. Genus Leptoclinum, Milne-Edwards.—Com- mon body sometimes coriaceous, sometimes gelatinous, thin, sessile and incrusting ; sys- tems few ; individuals arranged irregularly around common cloacal cavities; abdomen peduncled, short, smaller than the thorax. The tribe Botryllina (Ics BotryUiens, Milne- Edwards) comprises those compound Asci- dians that are united in systems around common excretory cavities or cloacae, and whose bodies are not divided into a distinct thorax and abdomen, the viscera being pushed forward on the side of the branchial cavity, and form- ing with the thorax an ovoid mass. Genus Butryllus, Gaertner ; synonyms, Al- cyonium, Auct., Polycyclus, Lamarck. — Com- mon body gelatinous or cartilaginous, sessile and incrusting; systems numerous, pro- minent, round or star-shaped, with central cavities; individuals, six to twenty in each system, lying horizontally with the vent far from the branchial orifice; branchial orifice simple (fig. 771.). Genus Botrylloides, Milne-Edwards. — This genus resembles the foregoing in most respects, except that the stars formed by the systems of animals are irregular and ramifying ; the cloacae being prolonged into the common mass as irregular internal channels, on each side of which the individuals are placed in linear series, instead of having a simple star- like arrangement around the cloacae, as in Botryttut. The animals of Botrylloides, more- over, have a nearly vertical position, and their orifices are closely approximate (Jig. 783.). We should perhaps also refer to the group of the Bolryllidic, an obscure form, first no- ticed by Molina*, and subsequently name
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