Kev. O. P. Cambridge on a new Trap-door Spider. 317 



that process, and is not continuous with that of the other side. 

 Body compressed posteriorly, covered with soft, rather loose 

 skin. Pectorals rounded, the middle rays longest, extending 

 beyond the vent. Ventrals very short, situated below the 

 middle of the base of the pectorals, and at a distance from one 

 another of rather more than the length of the fin ; the base of 

 each is surrounded by a fold of loose skin. Dorsal and anal 

 opposite one another, situated far back on the tail, almost 

 entirely enveloped in skin. Caudal rounded. Vent situated 

 rather nearer the origin of the anal than the root of the 

 ventrals. 



Dark greyish brown, irregularly spotted with white. 



Total length 8 inches, length of head 2*5, breadth of head 2 '5, 

 height of body 2. 



Hah. Dunedin and Bluff harbours. 



Trygon hrevicaudata. 



Trygon thalassia (?), Hutton, Cat. Fish. N. Z. p. 85, nee Columna. 



Female. Disk rather broader than long, the anterior margins 

 forming a very obtuse angle, which is interrupted by a short 

 projection of the snout. Body smooth, with a single small 

 oval tubercle in the centre of the back. Tail not longer than the 

 body, with a cutaneous fold along the lower side, but no upper 

 ridge ; armed with two serrated spines, the anterior one the 

 smaller, and in front of these a row of large ossifications ; sides 

 of the tail with smaller stellate ossifications. 



Brown above, whitish below. 



Length of disk 44 inches, breadth 48 ; tail 32 -f inches. 



Hab. Dunedin Harbour. 



The end of the tail of this specimen is broken off; but it is 

 evident that it could only have extended a few inches further. 



XLIL — On a new Genus and Species of Trap-door Spider 

 from South Africa. By the Rev. O. P. Cambeidge, M.A., 

 C.M.Z.S., &c. 



[Plate X.] 



In the ' Field ' of October the 10th, 1874, there appeared an 

 account of a trap-door spider whose nest is formed in the bark 

 of trees. Not long since examples of the nest (in one of which 

 was a female of the spider) were forwarded to me, with a 

 request that I would write a short notice of them for the 

 ' Field ; ' a brief account of the genus and species was accord- 



