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PROCEEDINGS OF THE 



[April, 1857. 



third of its length from the point of insertion. The walls of the 

 tubular digestive cavity are colored lake, and this cavity also, like 

 the sexual gland, appears to be divided into two parts, an upper 

 and lower. The sexual organs (ovaries in the specimen figured) 

 are of an orange tint; and the mouth is small and appears to be a 

 perfectly simple round opening. The marginal bulbs are conical 

 in form, as in Slabberia halterata, with a small black ocellus. 

 The shaft of the tentaculum is finely striated transversely, giving 

 it an annulate appearance, the terminal bulb is oblong and ellip- 

 soid in shape, colored by a dark red nucleus. Active circulation 

 of granular fluid is visible in the canal which perforates the shaft, 

 and appears to pass into the terminal bulb, which thence I con- 

 clude is also hollow, though the dark and opaque coloring of the 

 walls of this presumed cavity prevented my seeing the circulation 

 within it. The tentacula, though short, are borne in rather grace- 

 ful waving curves, and not carried stiffly or at right angles, as 

 Forbes relates of those of Slabberia halterata. 



This is also a rare species. 1 have hitherto taken but two 

 specimens, one on 12th June, the other two months later, 11th 

 August. 



DIPURENA CERVICATA, nov. spec 1 



I have met a specimen of Dipurena which had the slender tu- 

 bular connection between the upper cavity of the digestive trunk 

 and the intersection of the radiate tubes, so much longer than in 

 the last species, that it equalled in length the height of the bell- 

 cavity, and thus caused the sexual organs and digestive cavities to 

 lie wholly without the bell. This difference was accompanied by 

 a difference of outline in the disk, which was narrower propor- 

 tionately above, being more like that of Turritopsis nutricula, 

 when viewed in profile, the outline sloping inwardly in its descent 

 from the top to the tentacular rim. The tentacular bulbs also ap- 

 peared to be slightly smaller than in the D. strangulata. There 

 was no difference of coloration. This neck-like elongation of the 

 digestive trunk in this specimen, appeared to be permanent, for 

 in spite of the irritation of being laid flat upon its side in a watch- 

 glass for examination, it was not contracted but remained hang- 

 ing out. 



With regard to the value of coloration upon which considerable 

 stress seems to have been laid by Forbes, I may say a few words 

 in this connection. So far as my observations go, there are two 



