LIMA. 51 



1900. LIMA DECUSSATA, C. Gagel and F. Kaunhowen. Jahrb. d. k. preussisch. geol. 



Landesanst. fur 1899, p. 232. 



1902. J. P. J. Ravn. Mollusk. i Danmarks Kridtafl. : I. Lam- 



ellibr. (K. Danske Vid. Selsk. Skrift., 

 6 Raekke, nat. og. math. Afd., vol. xi), 

 p. 96, pi. ii, fig. 11. 



A. Wollemann. Fauna d. Liineburg. Kreide (Abhandl. 

 d. k. preussisch. geol. Landesanst., 

 N. F., Heft 37), p. 57. 



Description. Shell inflated, ovate or rounded-oblong, nearly equilateral. Urn- 

 bones small. Ears rather small, nearly equal. 



Ornamentation consists of numerous sharp ribs, separated by narrow grooves. 

 The ribs become less distinct on the anterior and posterior parts of the shell. 

 Numerous fine concentric ridges occur, and sometimes give rise to a tubercular 

 appearance on the summits of the larger ribs. 



Measurements : 



(1) (2) (3) (4) (5) 



Length 10 9 7 7 6'5 mm. 



Height . 13-5 12 11 10-5 9'5 



(1, 2, 4, 5) A. quadratics zone, East Harnham. 



(3) Uintacrinus band, Devizes Eoad, Salisbury. 



Affinities. L. semiaulcata, Nilsson, 1 is distinguished from L. decussata by the 

 ribs being limited to the median part of the shell, and by the relatively higher 

 valves. 



Peron thinks that L. pectinata, d'Orbigny, may be only a variety of L. decussata. 

 It appears to differ from the latter in having the ribs more tubercular and usually 

 fewer in number. 



Type. From the Senonian of Rinkerode, near Miinster. 



Distribution. Uintacrinus band of Devizes Road, Salisbury. Zone of Actino- 

 camax quadratus of East Harnham and Ashley Hill. Zone of Belemnitella mucronata 

 of Clarendon. 



LIMA (LIMATULA) WINTONENSIS, sp. nov. Plate VII, figs. %la,b, 22 a d. 



Description. Shell inflated, ovate, nearly equilateral, pointed dorsally. 

 Ornamentation consists of 15 or 16 strong, rounded ribs on the median part of 

 the valve only. The ribs are separated by very narrow grooves, and bear many 



1 'Petrif. Suecana' (1827), p. 25, pi. ix, fig. 3; Hennig, Eevis. Lamell. i Nilsson's 'Petrif. 

 Suecana' (1897), p. 28, pi. ii, figs. 14, 17. 



