(mit Ausschluss der Siphonophora) für 1904. 65 



kept for weeks in the aquarium, and if properly fed will show no decline in 

 color, while if the conditions become bad an immediate change is noticeable 

 in this as well as other features. Chas. W. Hargitt (5) siehe auch bei 

 Rhizostoma pultno. — G. vertens von Child nach T. H. Morgan 1899 citirt; 

 siehe L. 



2. Cubaia Mayer (2) p. 19: Tentacles are of two distinct kinds. Those of one 

 set are provided with adhesive pads, as in Gonionemus, and project from a 

 Zone shghtly above the bell-margin, their entodermal axes traversing the 

 gelatinous substance of the bell. The other tentacles arise from the bell- 

 margin, and are provided with terminal Clusters of nematocysts but not with 

 adhesive pads. The gonads are papilUform. There are no centripetal canals. 

 There are numerous otocysts upon the bell-margin projecting freely into the 

 water. — C. aphrodite Mayer (3) p. 21—23, f. 43 — 49 auf t. 5. Mature Medusa, 

 Development of Medusa. Bahamas, Tortugas. — C. geophila Mayer (3) p. 23 

 is closely alhed to C. aphrodite and may be simply a variety of the latter. 



3. Vallentinia Mayer (2) p. 20: Similar to Cubaia, expecting that the gonads are 

 sac-hke, and the otocysts are „enclosed inside the margiu of the umbrella." 

 1902 von Browne aufgestellt. 



4. Olindias Mayer (3) p. 20: The tentacles are of two sorts. Those of one sort 

 arise from the bell-margin, while those of the other set project from the sides 

 of the bell, in a zone above the margin, as in Gonionemus and Cubaia. There 

 are pad-üke Clusters of nematocysts on the aboral side near the distal ex- 

 tremity of the tentacles. These may or may not function as adhesive disks. 

 The gonads are papiUiform. There are four complete radial canals, 

 and a number of bhndly ending centripetal canals. The otocysts are at the 

 sides of the tentacle-bases, above the velum, and project in ward toward the 

 bell cavity. 1861 von Müller F. aufgestellt. O. tenuis Mayer (3) p. 23—25, 

 f. 50—52 auf t. 5, f. 53 — 57 auf t. 6. Die Jungen machen ein Gonionemus- 

 stadium durch. One of the few medusae that thrive best on the shallow 

 flats of the Bahamas and Florida coast, and is very abundant during the 

 Summer month. 



5. Olindioides Mayer (3) p. 20: Two sets of tentacles. Those of one set arise from 

 the bell-margin, are highly contractile and armed with partial rings of nemato- 

 cysts. The tentacles of the other set project at various levels from the sides 

 of the bell, their entodermal cores traversing the gelatinous substance. They 

 each bear an adhesive patch of ectodermal cells at or near their extremities; 

 six gonads, one on each radial canal, ribbon-Hke, and folded ; six complete radial 

 canals, and numerous bhndly ending centripetal vessels. Otocysts as in 

 Olindias. 1903 von Goto aufgestellt p. 1 — 22 t. 1 u. 2. 



* * 



5. Unterordnung. Trachymedusae. 

 Fam. Trachynemidae. Grobben p. 266. 



Browne 1904 p. 739 ghedert die 

 Fam. Aglauridae L. Agassiz 1862 ab und definirt diese: Trachomedusae 

 with eight radial canals, in the course of which are situated eight gonads. 

 Stomach on a peduncle. Numerous uniform tentacles. Sense organs external 

 and free. — Vgl. auch Maas (3) p. 29. 



Arch. f. Natnrgeseh. 68. J»hrg. 1902. Bd. U. H. 3. (XVI. d.) 5 



