312 PROFESSORS EDWARD FORBES AND J. GOODSIR ON SOME 
namely, the S. halterata, a native of the coasts of Cornwall. We have the 
pleasure of adding a second and very distinct species, to which the name of 
Slabberia catenata may be applied. 
It differs from the former, among other characters, most conspicuously in in 
having its poiser-like marginal tentacula thickened for half their length by a 
series of rings or bulbs, charged with pigment cells, and ranged in succession 
above the terminal bulb with a dark nucleus, so characteristic of the genus. 
The umbrella is deeply campanulate or subglobular, smooth and colourless. 
The subumbrella is much less in proportion than in its described ally; it is 
divided into equal portions by four canals, which open into a central marginal 
vessel. The very minute linear genital glands can scarcely be traced on the 
upper part of these vessels. The border of the general cavity is provided with a 
shelf-like veil. The tentacula are stout, four in number, colourless, and cylindrical 
in their upper, nodulose and annulated in their lower half. There are five or 
six ring-like or bulbous thickenings, besides the terminal bulb. Each is of an 
orange hue, and the lower ones are larger than the upper. The next above the 
terminal bulb is largest. The terminal bulb is also orange, but has a dark 
nucleus. The tentacula spring from ocellated bulbs. These are somewhat trian- 
gular in shape, pale yellow above, marked across the centre by a band of dark 
orange, below which, on a pale yellow ground, is the small black ocellus. The 
peduncle, or stomach, is longer than the tentacula when expanded to its full 
dimensions. It is highly contractile, and is of a dull olive hue, with indicatiens 
of darker cylindrical bands. The height of the umbrella was about two-tenths of 
an inch. ‘This curious medusa was taken off Tobermory, and afterwards near 
Loch Laigh in Mull. 
Hippocrene pyramidaia. Sp. Nov.—During our cruise, we had the good 
fortune to add no fewer than three new and very distinct species to the beautiful 
and singular genus Hippocrene or Bougainvillia. They, like their congeners, were 
all exceedingly minute. 
The first of which we name //. pyramidata, is distinguished conspicuously by 
the form of the ovarian lobes of the peduncle; instead of being quadrate, as in all 
known species, they are triangular, so that the entire peduncle assumes the 
shape of an inverted pyramid. 
The umbrella is transparent, smooth, colourless, and subglobular. The sub- 
umbrella is comparatively small and quadrately campanulate; its opening is 
protected by a four-lobed veil. At the four angles are the groups of connate eye- 
tubercles. Each group forms an oblong mass, the general colour of which is 
yellowish below and orange above. From four to six tubercles go to a mass, and 
the orange-coloured portion is lobed according to their number. On the lobed 
yellowish part below is a black eye-speck, one to each tubercle. One, or at most 
two transparent tentacula, were seen to protrude from each of the masses. The 


