MEDUSA of WOODS HOLE REGION. 



37 



with veryshort interposed tentacle-like structures; the long tentacles have prominent triangular bases, 

 at the apex of which are borne bright crimson i tcelli; between the bases of the long tentacles are 3 

 short tentacular processes and on each of these also is an ocellus, of color similar to those on the long 

 tenacles. 



All the tentacular organs are hollow, and have smooth surfaces. Manubrium large, with w ide base. 

 Gonads borne in conspicuous masses upon the upper portion of the manubrium; mouth large and with 

 prominent, everted lobes. 



Colors. — Bell transparent, pale milky white, tentacles pale yellow, ocelli crimson. 



Distribution. — Newport, R. I. 



This medusa is among the larger of the anthomedusse and is said to be one of the most beautiful. 

 I have not seen it. however, and the above description is condensed from that of Fewkes. 



TURRITOPSIS McCrady 1 18 '.. 



Turritopsis nutricula Mil Irady. Text cut. 



TurritopsU nutricula McCrady, Proceedings of Elliott So- 



Cietj of Natural History, V<>1 I, 1^.7 p. 127. 



L. Agassiz. Contributions to tin- Natural History 



,if the United states Vol. IV. 1862, p. ::(7. A. 



Agassiz, North American Acalephs, 1st;:., \>. 167. 



Haeckel, System der Medusen, 1879, p. 66. 

 a uniltiti idnuuiuta Fewkes, Bulletin Museum Com- 

 parative Zoology. Vol. VIII. 1881, ]i. 149. 

 TurrUopsu nutricula Mayer. Bulletin Museum Comparative 



Zoology. Vol. XXXVII, 1900; p. 38. 



Medusa high-hemispherical, with rather thin 

 walls; radial canals four, narrow; velum well 

 developed. Marginal tentacles numerous and of 

 equal size, each with a dark brown ocellus on 

 the inner side of its base. Tentacles usually long 

 and highly contractile. Manubrium large and 



when hearing gonads on its basal portion fills nearly half the upper part of the be] 

 with four pairs of knobs plentifully loaded with nematocysts. 



Ontogeny. — Brooks has described the development of this species in his memoir on North American 

 Hydromedusae. 



Oolors. — Bell transparent; tentacles with brownish bases; ocelli dark brown or blackish; gonads 

 cinnamon-brown; manubrium dull yellow, sometimes streaked with brown or orange. 



Distribution. — Occasionally taken at W Is Hole, Vineyard Sound, and southward. 



TurritopsU nntricula. 



Mouth huge and 



Famih MARGEUD£. 



KEY To THE GENERA. 



1. Marginal tentacles 8, rarely 4, symmetrically disposed \ U y """!"" 



1 Podocoryne 



2 Marginal tentacles 8, rudimentary Stylactis 



:-;. Marginal tentacles 8 to 16 WiMa 



4. Tentacles in 8 clusters Lizzie 



5. Tentacles in 4 clusters Bougainvillin 



6. Tentacles in 4 clusters, each margined by an erect, chivate pair Nemo 



