HIPPOLYTE VARIANS. 603 



siliquosa which flourish in the " Laminarian zone." In 

 shape, colour, and occasionally in its attitude this form, as 

 Professor Herdman has pointed out, closely resembles the 

 Halidrys pods. 



Young specimens of a uniform brown tint occur chiefly 

 among the fronds of Dictyota dichotoma (PI. 33, fig. 9). 

 Mature green prawns are somewhat rare at Piel, though 

 young ones are plentiful in the clear and shallow water of 

 the Zostera pools. Red, again, is not a tint commonly found 

 in full-grown Hippolyte varians at Piel, though a few 

 large and many small pink specimens were from time to 

 time discovered. Very probably the somewhat muddy 

 water, stunted weeds, and the comparative scarcity of clean 

 red weed are the causes of the rarity of this form. The 

 uniformity of their respective tints in these brown, green, 

 and pink prawns is on a closer examination less apparent. 

 The dorsal median line is generally marked by a white or 

 yellow stripe, and the sides of the carapace or of the whole 

 body may be spotted with minute blue dots, two of which, 

 just below and behind the orbit, are curiously constant. 

 Again, the terms brown, green, and pink cover a great 

 number of shades, from light chestnut to black-brown, light 

 green to olive, lake colour to mauve. It is, however, the 

 immature variegated specimens that present the most re- 

 markable cases of colour pattern and of resemblance to their 

 surroundings. 



One of the commonest of these is the " red liner," shown 

 in PI. 32, fig. 5, nestling amongst a tuft of weeds. The colora- 

 tion is striking, and differs from that of almost any adult 

 Hippolyte varians. A median dorsal and a median ven- 

 tral stripe run from end to end of the transparent body, 

 whilst each segment is crossed by a bar of minute yellow and 

 red spots. The eye-stalks, the inner edges of the antennal 

 scales, and the joints of the thoracic limbs are reddish, while 

 each tail lobe has an elliptical red mark with a clear centre. 

 The stomach and liver are visible through the carapace, and 

 appear slightly opaque greenish yellow. By reflected light 



