314 MR. F. F, LAIDLAW ON THE [Apr. 21, 
As in that species, the testes as well as the ovaries lie on the 
dorsal side of the body. 
THYSANOZOON AUROPUNCTATUM Coll. 
Thysanozoon auropunctatum Lang [6]; von Stummer-Traunfels 
[13]. 
One specimen, unfortunately immature and in a poor state of 
preservation, although it has retained its colour fairly well. 
PSEUDOCEROS BEDFORDI, sp. n. (Plate XXIII. fig. 9.) 
This strikingly handsome and large species was obtained by 
Messrs. Lanchester and Bedford in Singapore Harbour. The 
single specimen, kindly given me by Mr. Lanchester, was unfortun- 
ately in fragments and fully one-half of the specimen missing, so 
that a satisfactory examination was not possible. I believe, how- 
ever, that it was provided with a pair of penes. The colouring is 
very beautiful, and quite sutticiently marked to render the identifi- 
cation of this species in the future a simple matter, thanks to the 
careful drawing for which I am indebted to Miss Dust. 
On the label accompanying the specimen is written “Singapore 
Harbour, from tide-marks to 10 faths.” I venture to associate 
with this species the name of my lamented friend the late 
Mr. Bedford. 
PSEUDOCEROS COLLINGWOODT, sp. nh. 
Closely allied to Ps. cerebralis (Kelaart) and Ps. striatus 
(Kelaart), but smaller than either. It has the same regular 
convolutions at the margin of the body that are shown in 
Collingwood’s figures, and the coloration is similar especially to 
Ps. cerebralis. 
ene thyalboubets...-- 30 mm. 
Bread t hirmness cs.) 25 
Mouth-opening,about 3 ,, from the anterior margin. 
Sucker about ......... 8 ,, behind the mouth. 
The specimen isimmature and the penis is unpaired. Colour— 
dorsal surface mottled dark brown and brownish white. The 
extreme margin is white, but the white rim is exceedingly thin ; 
just inside this is an equally fine black line. Ventral surface pale 
brownish white, becoming darker towards the margin, which is 
edged with black and white just as on the dorsal surface. 
PSEUDOCEROS ? RUBELLUS, Sp. n. (Plate XXITI. fig. 10.) 
A number of specimens of this very small species were collected. 
One of these was “found under a stone between tide-marks. It 
was magenta-red in colour. Nov. 1899.” Though very small, 
these specimens appear for the most part to be mature. They 
bear a close resemblance to Pseudoceros kelaartii (Coll.) in colour, 
but the latter species is much larger and has the eye-spots arranged 
quite differently. Thearrangement in the present species is shown 
