92 MARINE BIOLOGY OF THE SUDANESE RED S@A. 
The intestines are whitish, the liver greyish white. The spermatotheca is 
covered with fine brown dots. 
The jaws are brownish near the edge, with three or four longitudinal 
stripes of darker brown. The rest of the surface is whitish. They are 
covered with a tessellated pattern which under a high power is seen to consist 
of small projecting scales with roughly semicircular and indented edges. 
The scales do not overlap but stand each at a little distance from the others. 
The formula of the radula is about 20 x 25.1.25. In the previous descrip- 
tion by Mr. Crossland and myself, we stated that the teeth in the middle 
part of the half rows are denticulate only on the external side, but though 
this is the appearance which they present in situ they are in reality all 
denticulate on both sides. It is extremely difficult to see the shape of the 
whole tooth from one point of view. They generally present the appearance 
of bearing 3 lateral denticles only, but in reality 5-9 were found to be present 
on all the teeth which I examined in detail. The hooks of the teeth are 
fairly strong and erect. 
The cesophagus passes into a long unarmed stomach with thin walls, and 
that into a second stomach armed with a circle of 16 plates, yellowish, tri- 
angular and alternating in size. The whole alimentary canal is a tube of 
unusually uniform breadth, not presenting marked pouches or constrictions. 
The two divisions of the liver adhere to the outer wall of the stomach and 
no long connecting ducts are visible, nor could I find any hepatic diverticula 
extending into the cerata. The liver can be removed without difficulty from 
the body-cavity and does not adhere to its walls. 
The hermaphrodite gland forms three large white spherical masses. 
Mr. Crossland also describes and gives a rough figure of the spawn. It 
is deposited in a single coil, which he says resembles a string of beads, each 
bead containing from twenty to fifty eggs. The colour of the coil is light 
yellow-brown, and there are four gelatinous envelopes—(1) the attachment 
jelly ; (2) and (3) coverings of the egg-strings ; (4) a covering round each 
separate ege. It would appear from his figure that the ege-strings are 
twisted within the string of jelly, independently of the coiled shape of this 
latter. 
These specimens seem referable to the forms previously described as 
Crosslandia viridis and fusca, the two being, as was surmised, varieties and 
not separate species. It is preferable to keep fusca as the specific name 
rather than viridis, firstly, because the larger of the specimens belong to that 
variety, and secondly, because in the event of the genus Crosslandia being 
united with Scyllwa the name Sc. viridis is preoccupied by one of Alder and 
Hancock’s species. 
Provisionally I keep the genera distinct though now thinking the difference 
between them of doubtful generic value, since the young Crosslandia has 
