302 MR. F. F, LAIDLAW ON THE [ Apr. 21, 
Acotylea (con.). 
LEPTOPLANIDE. 
2.* Semonia penangensis, sp. Nn. 
3.* Leptoplana malayana, sp. n. 
as obtuswm (Coll.). 
CRYPTOCELIDIDA. 
5.* Bergendalia anomala. 
LATOCESTIDA. 
6.*  Latocestus argus. 
Cotylea. 
PSEUDOCERID&. 
7.  Thysanozoon allman. 
Cee a auropunctatum. 
9.  Pseudoceros hancockianus (Coll.). 
10. a6 buskit (Coll.). 
Wil. - kelaartvi (Coll.). 
1A. i bedfordit, sp. n. 
a" ws collingwoodi, sp. n. 
14.*  Pseudoceros ? rubellus, sp. n. 
DrpPostHIDz. 
15.*  Asthenoceros woodworthi, sp. n. 
PROSTHIOSTOMID&. 
16.*  Prosthiostomum pallidum, sp. v. 
if 3 aurantiacum (Coll.). 
Species marked with an asterisk were collected by Mr. Evans. 
In this communication I have not ventured to give an account 
of the anatomy of any of the species, contained in the collection, 
which can be regarded as being at all complete. Such an account 
would have expanded the paper beyond limits reasonable in a 
systematic description. I have attempted only to give such a 
diagnosis of each species as shall render its future identification a 
matter of tolerable certainty, and to call attention to any of the 
more striking features which presented themselves. 
Family PLANOCERIDA. 
PuaNnoceRA sp. (Plate XXIII. fig. 1.) 
A fragment of tissue of which I made microscopic sections 
proves to belong to a species of this genus, but being only a 
fragment I will not attempt to describe or name it, though it is 
obviously new. The section passes through the penis and prostate, 
and the spines lining the lumen of the former are of such a remark- 
able character that I venture to figure one of them, in the hope 
that a perfect example may be obtained ere long. The length of 
each spine is roughly ‘08 mm., its breadth at the base ‘02 mm. 
NoroPLana, gen. nov. 
NovoPLANA EVANSII, sp.n. (Plate XXIII. fig. 2.) 
A number of specimens belonging to this species were taken by 
