SIR C. ELIOT—REPORT ON THE NUDIBRANCHS. 103 
tendency to contract and disappear when preserved, and the real number 
may have been greater. The rhinophore sheaths, the branchiz, and three 
pairs of dorsal processes are much as in Ploc. maderw, and there are only 
indistinct traces of other processes lower down on the sides of the body. 
The branchize form a rather wide bow in front of the anal papilla. The two 
lateral plumes on either side are connected at the base, with the common 
result that the number can be counted as either five or three. 
The integuments are thin. The buccal mass is fairly large. A rather long 
and broad tube, laminated internally, runs from it to the liver. The liver- 
cavity appears to act as the stomach, and no external dilatation was found. 
The intestine is thin. The liver is of a deep chocolate-brown with a whitish 
layer of the hermaphrodite gland outside. 
The labial armature is a mass of closely packed rods, of somewhat varying 
shape, which form two greyish-yellow hatchet-shaped plates. The radula 
consists of 21 rows, with indications that three or four more have been worn 
off in front. The first 14 rows are of a deep reddish brown, the next four 
ure orange, the next two bright light yellow, and the last white. The 
formula is 9 (or 10)+3.0.38+9 (or 10). The rhachis is very wide and 
folded down the middle so as to form a deep valley, and divided into areas 
by transverse lines corresponding to the rows of teeth. The three innermost 
teeth are hamate. The first has a pointed base which projects into the 
rhachis and looks like another tooth. This first tooth is not much smaller 
than the others, but the second and third have larger and more spoon-shaped 
hooks. The nine or ten outer teeth are not hamate: the outer ones are mere 
plates, and the two or three nearest to the hamate teeth show irregular 
prominences arising from a plate. 
The central nervous system is yellow and markedly granulate. The 
cerebral and pleural ganglia are distinctly divided. 
The lower part of the vas deferens and the glans penis bear very numerous, 
rather elongate, irregularly arranged spines, and there are some larger scales 
or prominences in the sheath of the penis. The prostate is whitish and 
very large. It is of a ramified or reticulate appearance and surrounds the 
spermatotheca. The large spermatotheca and the spermatocyst are both 
elongate. The end of the female branch is very thin. 
Since the above was written Mr. Crossland has sent me two more specimens 
of this species from Dongonab Harbour, and says that the animals were in 
life extremely beautiful. His notes are as follows :—“ Largest specimen, 
when fully extended, 85 mm. long including the extremely acuminate tail, 
which is about 15 mm. Another specimen 54 mm. long, 8 mm. broad. One 
specimen has a much darker tint than the other, like half-dry blood. The 
yellow spots are broad rings, not always round, with dark brown centres and 
thin brown rings bordering the yellow outside. The lighter specimen has 
many small flecks of yellow as well as the larger rings, but the dark 
