Bulletin of the Bureau of Fisheries . eur in 1*09 in designating a Greenland medusa, presumably identical withthat later described by Oken. In 1X«> Eschseholtz, under the binomial here used, described with somewhat mere detailand accuracy a medusa quite similar. Fabricius, however (Fauna Grcenlandica-, 17sn, p, 366), bad used the same speciticterm in describing probably the same, or a similar medusa. Haeekel has shown (System der Medusen, p. 139), that all these earlier accounts were either so inadequate or inaccurateas to leave serious doubt whether the medusa described by A. Agassiz (op.
Bulletin of the Bureau of Fisheries . eur in 1*09 in designating a Greenland medusa, presumably identical withthat later described by Oken. In 1X«> Eschseholtz, under the binomial here used, described with somewhat mere detailand accuracy a medusa quite similar. Fabricius, however (Fauna Grcenlandica-, 17sn, p, 366), bad used the same speciticterm in describing probably the same, or a similar medusa. Haeekel has shown (System der Medusen, p. 139), that all these earlier accounts were either so inadequate or inaccurateas to leave serious doubt whether the medusa described by A. Agassiz (op. cit.) with critical detail was identical withthat of the earlier accounts. He therefore proposes to credit both the generic and specific terms to the latter, and sodesignates them in his account (op. cit.). While in strict conformity with established usage the priority of the oldcdescriptions should have recognition. I have accepted Haeekels version and leave a final adjustment for those havinglarger concern in problems of Orchistoma K Woods HOLE REGION. 45 Family CANNOTID/C. Radial eauals with numerous, pinnate, blind diverticula Ptycho PTYCHOGENA A. Agassiz i L865).Ptychogena lactea A. lactea A. Agassiz, North American Acalephje, 1865, p. 137. Haeckel, System h-r Medusen, 1879, p. 117. Bell dome-shaped, about twice as broad as high, with rather thick walls; marginal tentaclesnumerous and filamentous; radial canals 4, lateral walls with numerous pouch-like diverticula: gonadsvariously folded and disposed beneath the canals; gastric cavity very flat, quadrate in form; mouth large, but devoid of definite lobes or lips. The i lusa seems wholly devoid of sensory organs of any sort. According to Agassiz, from whose account this description has been condensed, this is a deep-seaform, seldom coming to the surface, and when doing so apparently killed by the action of the mtogeny unknown. Colors.—Gonads, radial canal
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfisheries, bookyear19
