90 MARINE BIOLOGY OF THE SUDANESE RED SHA. 
If this form is not a new species it is possible that it may be the young of 
L. genei or a variety of L. marmoratus, which itself may be the young of 
L. genei. If it is identical with any Mediterranean species, it would be 
interesting to know whether it is a natural denizen of the Red Sea or whether 
it has made its way through the Suez Canal. Lomanotus has not hitherto 
been recorded from the Indo-Pacific area. 
L. vermiformis appears to be sexually mature, but it does not follow from 
this that it has attained its full size and final shape, for nudibranchs continue 
to grow after their sexual organs are functional. 
CROSSLANDIA FusCcA, Eliot. 
(Eliot: “ On Nudibranchs from Zanzibar.—I.,” Proc, Zool. Soe. 1902, pp. 64-68.) 
Twelve specimens of various sizes and colours. The following notes, made 
by Mr. Crossland on the living animals, refer to the four largest, but he seems 
to imply that some of the smaller specimens were green. 
“Four brown specimens from buoys at Nur el Shekh, Khor Dongonab, 
Red Sea, 10.12.07. Three found together on one buoy, one on the other. 
Length when fully extended is 38 mm. 
“‘ Colour varies as follows :— 
“ First specimen (like one taken here in May 1907) clear translucent fucoid 
brown with darker dots and a darker line edging dorsal crest and cerata. 
A few specks of opaque white laterally ; two are conspicuous and bear 
conspicuous papille in the centre. A white line is present inside the dark 
edging of the crests. 
“Second specimen ditto, but more white, in form of patches of opaque 
pigment put on so thinly as to be translucent. 
“The third and fourth specimens are of a distinctly darker brown, with the 
addition not only of whitish but of purplish pigment, exactly the tint of the 
patches of encrusting nullipore and foraminifera generally present on weeds. 
This colour is remarkably strongly developed in the fourth individual. The 
bright blue circular spots noted at Zanzibar are here present also. In the 
third specimen they are easily visible to the naked eye, in the others only 
under a lens (x 10). In no. 2 they are rather dull and ill-defined. 
“The series from green onwards is complete, showing all the range of 
protective colour devices characteristic of habitat among Zostera, Fucus, or 
darker weeds. It is to be noted that the colour scheme does actually corre- 
spond with the habitat; though there is little or no brown fucoid weed on 
these buoys, the growths present are of dark colours. Compare the exactly 
similar series of colours found in various species of Tectibranchs, where one 
species contains individuals of bright green, green with nullipore purple 
patches, fucoid brown and ditto with purple. In some of these cases the 
protective adaptation includes also the form of the animal (flattened) : here 
