On a new Species of Liphistius. 241) 



their under surfaces, are seen passing from their centres of ossi- 

 Hcation. 



Ill all those figures the same letters apply to the same bones. 

 iiiA\ iiia.\illa ; mii, iiiaiidible ; d, dentary ; «//, angular ; su.o, sub- 

 orbital ; X, cheek-plate above the maxilla ; y, portion of hyo- 

 uiandibiilar(r') ; c>/j, operculum; s.o/j, suboperculum ; />r, branchio- 

 stegal plates or rays ; \st .t.cl, first supraclavicular ; 2nd8.cl, second 

 supraclavicular ; cl, clavicle ; i.cl, interclavicular. 



XXXI. — On a new Species of Liphistius {Schiodte). 

 By the Rev. O. P. Cambridge, M.A., C.M.Z.S. 



The British-Museum collection contains a fine specimen of 

 this remarkable genus from Penang, the same locality whence 

 tlic typical species L. desultory Schiodte*, was obtained. In 

 almost every essential particular the British-Museum example 

 agrees with L. desultory except in being larger and possessing 

 four mammillary organs of considerable size beneath the 

 abdomen, inmiediately behind the second pair of spiracular 

 apertures. Prof. Schiodte makes no mention of such organs, 

 describing L. desultor as " mammillis textoriis nuUis." 

 Whether the organs in the British-Museum specimen are, 

 or not, true spinning-organs seems doubtful, inasmuch 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. Schiodte described Liphistius desultor 5 

 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. Schiiklte. From this communication 

 it appears that when the specimen came into Prof. Schiodte'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. Schiodte thinks it almost im- 

 possible for the collector (Dr. Teylingen, himself a good zoolo- 

 gist) to have overlooked or destroyed the mammilla?, 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 Krover's ' Natur- 

 hist. Tidsskr. X. R.' Bd. ii. 1849, pp. C17-G24, tab. 4. 



