30 BULLETIN OF THE BUREAU OP FISHERIES. 



B. With a single conspicuous tentacle, others rudimentary or unequally developed. 



s. Large tentacle stout and subtriangular; --titer three rudimentary; bell elongate oval or rectangular in 



-nit line: manubrium short and thick Euphysa 



9. A single large, long tentacle, two very small, one rudimentary; bell hemispherical, slightly asymmet- 

 rical i 'orymorpha 



lit A single greatly enlarged tentacle, with thick base, from which secondary medusse arc budded; hell 



evidently asymmetrical Hybocodon 



SYNCOKYNE Ehrenberg (in part, 1834). 



Syncoryne mirabilis (L. Agassiz). PI. V, iig. 1. 



Sarsia mirabilis L. Agassi/. Memoirs American Academy of Arts and Sciences, V--I- IV, lsi-.t, p. 224. 



Ooryne mirabilis I. agassiz, Contributions to the Natural History of the United stales. Vol. IV, 1862, pp. Is:-, 340. 



Syncoryne mirabilis Allman, Monograph of the Gymnoblastie Hydroids, 1871. p. - 27s. 



Sarsia mirabilis Haeckel, System der Medusen, 1879, p. 17. 



Bell subhemispherical, very transparent, varying from ti t < > 1L' nun. in diameter. Tentacles 4. 

 very long and filamentous, but capable of great contraction. Manubrium long and pendulous, extend- 

 ing far beyond the velum, but highly contractile, often coiled within the bell. Mouth simple. 

 Gonads borne on the manubrium, at maturity enlarging this organ till it tills the bell cavity. A very 

 common medusa, ranging in season from February to May. 



Colors. — Bell very transparent, manubrium pale greenish, tentacular bulbs greenish about a 

 brownish center, within which is located the black ocellus. 



Distribution. — Fairly common- throughout the region; reported by Fewke's as somewhat rare a1 



Newport. 



Syncoryne reticulata (A. Agassi/.). 



Syndictyon reticulatum A. Agassiz, in L. Agassiz, Contributions Natural History United States, Vol. IV. 1862, p. 340. North 



American Aral- pic- , Is-.:-, p. 177. 

 Sy)icory-ne reticulata allman, Monograph of the Gymnoblastie Hydroids, 1871, p. 283. 

 Sijndyctyon reticulatum Haeckel, System der Medusen, 1879, p. 21. 



Medusa very similar to the preceding, but said to he distinguished in younger stages by the 

 spirally disposed nematocysts about the distal portions of the tentacles, and by the reticulated disposi- 

 tion of the nematocysts over the exunibrella. These characters said to disappear after maturity, whin 

 the species is chiefly distinguished by the permanently red-brown ocelli. 



This medusa has not been distinguished by the present writer, nor have I seen it reported by 

 recent students of the group. This brief description is taken from A. Agassiz's account -North Amer- 

 ican Acalephte, page 177-180). 



Distribution. — .Massachusetts Bay, Boston Harbor, STahant (Agassiz, Clark). 



Syncoryne producta Hargitt. PI. I, fig. 1. 

 Corym producta Hargitt, American Naturalist, V--1- XXXVI, 1902, p. 550. 



Bell high hemispherical or ovate, 1.5 mm. in long diameter by I mm. in short diameter; tentacles 

 4, rather long and with prominent basal bulbs, which are orange colored with a central black ocellus. 

 Manubrium long and distinctively sarsian in character, projecting far beyond the velum, but capable 

 -d' great contraction, its terminal portion bulb-like, basal portion forming a gastric pouch; mouth 

 simple. Gonads raedusoid and borne in a whorl about the base of tic manubrium. This is the first 

 member of the genus from this region or from American waters known to pro. luce proliferous medusae, 

 as do Forbes's species, Sarsia </- mmifera ami S. prolifera. 



Colorit. — Bell very transparent; manubrium with basal portion orange; terminal bulbs proximal 

 light sky-blue; distal green; tentacle bulbs orange, margined with delicate greenish; ocelli black. 



Distribution. — A single specimen taken at Woods Hole. 



DIPTJRENA McCrady (1857). 



Dipurena strangulata McCrady. PI. I, rig. 2. 



lhpiir.ua strangulata McCrady, Proceedings of the Elliott Societyof Natural History, Vol. I. 1857, p. 33. 1. Igassiz, Contri- 

 butions to the Natural History of tin- United States, Vol. IV, 1862, p. 341. A. Agassiz, North American Acalepha-, 

 1865, p. 181. .1. W. Fevvkcs. Bulletin of the Museum of Comparative /.---logy, Vol. VIII, 1881, p. 155. 



Slabberia strangulata Haeckel, Prodromus Systemse Medusarum, Is77, No. 15. 



Dipurena strangulata Haeckel, System der Medusen, 1*70, p. 23. 



