xv. FOSSILS OF THE IRON-SAND. 415 



in the iron-bands, but these being of oolitic texture, makes the recognition 

 doubtful. 



CONCHIFEKA. 



Unio Stricklandii, new species. Outline transversely ovate, without posterior 

 sinuosity ; beaks depressed ; ligament very prominent ; posterior area marked 

 by numerous and regular rugae. (PI. XVI. fig. 3.) It differs from TJ. valdensis 

 in figure and in the characters about the ligament and posterior slopes. The 

 beaks are much eroded. Breadth above two inches ; length a little above half the 

 breadth. Found by Mr. Strickland twenty or thirty feet below the top of 

 Shotover Hill. 



Unio porrectus. Sow. Near Cuddesden. 



Unio subtruncatus (?). Sow. Fitton's Memoir, pi. xxi. fig. 15. Shell very thin, 

 with delicate transverse striae. (PI. XVI. fig. 4.) The shell figured in Fitton's 

 Memoir agrees exactly in shape, but does not shew the external surface. Shot- 

 over Hill. 



Cyrena media. Sow. M. C. pi. 527, fig. 2 ; so it appears to me. (PI. XVI. fig. 5.) 

 Other forms of Conchifera occur, but are not clearly made out. Shotover Hill. 

 GASTEROPODA. 



Paludina elongata. Sow. M. C. pi. 509, figs, i, 2. Rare. Shotover Hill, near 

 Cuddesden. 



Paludina Sussexiensis. Mant. Fitton's Memoir, pi. xxii. fig. 6. Rare. (PI. XVI. 

 fig. 6.) Some specimens are shorter than the figure, and have the air of Littorina. 



Paludina subangulata. n. sp. (PI. XVI. fig. 7.) Ovato-conical, the volutions 

 slightly angular or subcarinate, and striated spirally above the carina, not below 

 it. Frequent. The obscure carina sometimes appears on shells quite deficient 

 of spiral striae ; they are perhaps worn specimens. Shotover Hill. 



Paludina ornata. Phil. Ovato-conical ; the volutions very rounded, and covered 

 with spiral striae, which sometimes appear larger and smaller alternately, and are 

 crossed by distinct lines of growth. (PI. XVI. fig. 8.) Frequent. This shell looks 

 as much like Cyclostoma as any of the spirally-threaded Paludinae known to me. 

 The spiral threads are, in some specimens, more prominent about the middle of 

 the volution. Shotover Hill. 



There is a colour-band on one of my spiral shells ; but I cannot determine the 

 species. 



On this list (which omits only some forms too imperfect for 

 notice) it may be remarked, i . That very few more organic forms 

 are to be expected from the western side of Shotover, the part as 

 yet chiefly examined ; for the specimens include perhaps only two 

 or three not found by Jelly and mentioned by Strickland and 

 Fitton. 2. That none of the marine forms usual in lower greensand 

 occur in it. 3. That while the general analogy is to estuarine and 

 fresh- water species, and while some of the species seem to be either the 

 same or very nearly the same as known Mid-Wealden types, there 

 are characters in some of the spiral shells worthy of remark, as tending 

 perhaps towards Littorina or Cyclostoma as much as to Paludina. 



Admitting, on the evidence which has been adduced, that the 



