. Carnegie Institution of Washington publication. PART III —THE SUBGENUS CYCLOSALPA. I BY WILLIAM KEITH BROOKS. The subgenus Cydosalpa, including S\ pinnata, S. affinis, S. virgula, and 5". floridana, is well marked, and distinguished from other salpas by many structural characteristics. The subgenus owes its name to the shape of the colony of the aggregated form, which is a wheel or rosette, as is shown in figures 8 and 9, plate 2. Three of the four known species of Cydosalpa—S\ pinnata, S. affinis and S. floridana—have in the solitary form, peculiar luminous organs. No luminous organs a
. Carnegie Institution of Washington publication. PART III —THE SUBGENUS CYCLOSALPA. I BY WILLIAM KEITH BROOKS. The subgenus Cydosalpa, including S\ pinnata, S. affinis, S. virgula, and 5". floridana, is well marked, and distinguished from other salpas by many structural characteristics. The subgenus owes its name to the shape of the colony of the aggregated form, which is a wheel or rosette, as is shown in figures 8 and 9, plate 2. Three of the four known species of Cydosalpa—S\ pinnata, S. affinis and S. floridana—have in the solitary form, peculiar luminous organs. No luminous organs are described in 5". virgula, and I have had no opportunity to study this species. It is not impossible that these organs will be found to be present in this as in the other cyclosalpas. In S. pinnata the luminous organs are present in the aggregated form as well as in the solitary form. In the other species they seem to be restricted to the solitary form. One of the most notable of the common characteristics of the cyclosalpas is the in- testine of the solitary form. This is long and runs upward and forward from the ventral stomach to open into the cloaca or median atrium on the dorsal side of the body a little posterior to the ganglion. It lies in that part of the body-cavity which is included in the so-called gill. Plate xxxv of my memoir on " The Genus Salpa " is a median longi- tudinal section of an advanced embryo of 5\ pinnata, showing the gill, g, between the pharynx, which is colored red, and the cloaca, which is colored green. The intestine, p, is shown in its place in the cavity of the gill, while the anus, p', opens into the cloaca. The relation of the intestine to the gill is also shown in S. pinnata in figures I, 2, and 3 of this memoir. Figure 7 of plate 2 of this memoir is a side view of an advanced embryo of 5*. flori- dana, showing that the relation of the intestine to the gill is the same as it is in the other cyclosalpas. 81. i3 FIG. i.
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