On a new Species of Liphistius. 249 
their under surfaces, are seen passing from their centres of ossi- 
fication. 
In all these figures the same letters apply to the same bones. 
mx, maxilla ; mn, mandible ; d,dentary ; ag, angular; sw.o, sub- 
orbital; 2, cheek-plate above the maxilla; y, portion of hyo- 
mandibular (?); op, operculum; s.op, suboperculum; br, branchio- 
stegal plates or rays ; 1st s.c/, first supraclavicular ; 2nd s.cl, second 
supraclavicular ; cl, clavicle ; z.cl, interclavicular. 
XXXI.—On a new Species of Liphistius (Schiédte). 
By the Rev. O. P. Campripee, M.A., C.M.Z.S. 
Tue British-Museum collection contains a fine specimen of 
this remarkable genus from Penang, the same locality whence 
the typical species L. desultor, Schiédte*, was obtained. In 
almost every essential particular the British-Museum example 
agrees with L. desuitor, except in being larger and possessing 
four mammillary organs of considerable size beneath the 
abdomen, immediately behind the second pair of spiracular 
apertures. Prof. Schiédte makes no mention of such organs, 
describing ZL. desultor as ‘“mammillis textoriis nullis.” 
Whether the organs in the British-Museum specimen are, 
or not, true spinning-organs seems doubtful, masmuch as 
an examination lately made under a microscope by Mr. A. 
G. Butler has failed to reveal any spinning-tubes. } 
It is not without some reluctance that I have determined to 
characterize the example in the British Museum as a new 
species. It appeared to me possible that the mammillary 
organs might have been overlooked or destroyed in the speci- 
men from which Prof. Schiddte described Liphistius desultor ; 
I am, however, compelled to shut out the idea of this possi- 
bility, after receiving a communication on the subject (through 
Dr. Thorell) from Prof. Schiédte. From this communication 
it appears that when the specimen came into Prof. Schiédte’s 
hands it was in a dry state, having been opened along the 
middle line of the underside of the abdomen and, after ex- 
traction of the contents, stuffed with cotton; it was then 
placed in spirit of wine. Prof. Schiédte thinks it almost im- 
possible for the collector (Dr. Teylingen, himself a good zoolo- 
gist) to have overlooked or destroyed the mammille, if they 
had been present; the incision through the abdomen had the 
appearance of being exceedingly clean and even; and the 
surface showed no loss whatever of substance. Under these 
* Vide description and figures of Liphistius desultor, in Kroyer’s ‘Natur- 
hist. Tidsskr. N. R.’ Bd. ii. 1849, pp. 617-624, tab. 4. 
