56 



BULLETIN OF THE BUREAU OF FISHERIES. 



Aglantha conica llargitt. Text cut. 



Aglantha conica Hurgitt, Biological Bulletin, Vol. IV, 1902, p. 21. 



Bell high, with rather sharp apical projection which is slightly constricted at its base in many 

 specimens. Bell walls rather firm, and when compressed tending to wrinkle longitudinally, a condi- 

 tion which often appears also in preserved specimens. Manubrium long and 

 pendulous, though not reaching the velum; peduncle gelatinous; gastric portion 

 much as in the preceding species, as, indeed, are other general characters. 

 Radial canals 8, extending the length of the peduncle. Gonads 8, cylindrical 

 and suspended from the upper portion of the radial canals. Velum well devel- 

 oped and the chief, if not sole, organ of locomotion; movements quick and 

 erratic, the medusa' darting with arrow-like swiftness through the water. Ten- 

 tacles apparently numerous, but mostly lacking in the specimens taken, not- 

 withstanding the effort to distinguish them on living specimens. Those present 

 rather short and blunt. No marginal organs (otocysts) distinguished even in 

 living specimens. 



In many respects the specimens resemble very much the preceding species 

 and were at first taken for the young. A comparison as to size and sexual 

 maturity, however, seems to show undoubted specific distinctness as elsewhere 

 pointed out. Average size from 5 to 6 mm. high by about half as wide. 

 Ontogeny entirely unknown. 



Colors. — Bell very transparent, with only the slighest irridescence by reflected light 

 Dial rib ut ion. — Taken chiefly off Nantucket; in fewer numbers at another time off Chacham, Mass. 

 Collections were made with the open netatdepths of from 12 to 20 fathoms. August. 



Family GERYOXIIl.-E. 



Aglantha conica. 



KEY TO THE GENERA. 



1. Three centripetal canals between each pair of radials Liriope 



2. One centripetal canal between each pair < >f radials Glossocodon 



LIRIOPE Lesson (1843). 



Liriope scutigera McCrady. 



Liriopt scutigera McCrady, Proceedings Elliott Society oi Natural History. Vol. I, 1857, p. 208. 

 Liriantha scutigera Haeckel, System der Medusen, 1879, p. 287. 



Bell hemispherical, with thick walls. Radial canals narrow, 4 in number. Manubrium very 

 long, extending far beyond the margin; mouth simple, devoid of lobes; lips small, fringed with 

 nematocysts, short gastrostyle protruding from the mouth. Tentacles long, hollow, very flexible, 

 and with nematocysts arranged in definite rings. Otocysts 4, each with a club-shaped organ. 

 Gonads flat and spindle-shaped in outline, disposed beneath the radial canals. Ontogeny unknown. 



Distribution. — Newport, R. I. (Fewkes). 



Liriope cerasiformis Lesson. PI. V, fig. 4. 



Liriopt cerasiformis Lesson, Histoire Naturelle Zoophytes Acalephes, 1843, p. 332." Haeckel, System der Medusen, 1879, p. 



289. Maas, Craspedoten Medusen der Plankton-Expedition, 1893, p. 3S. Hargitt, Biological Bulletin, Vol. IV, 



1902, p. 16. 

 Liriope exigua (et cerasiformis) Haeckel, Familieder Geryoniden, 1864, p. 24. 



Bell eubhemispherical, with firm, rather thick walls; size averaging about 10 mm. broad by 

 slightly more than half as high. Radial canals 4, quite distinct, centripetal canals 12, 3 between each 

 two radials. The centripetal canals are only evident upon very critical examination, and this may 

 account for their absence from the earlier accounts of McCrady and the later one by Fewkes, from 

 which a part of the description of the preceding species is condensed. The central of these canals is 

 rather long and narrow with rounded apex, the lateral ones are about half as long and of similar 

 shape. The marginal canal is wide, and communicates freely with both the radial and centripetal 

 canals. 



