224 mrs. jane longstaff on [May 1909, 



convex whorls. Ornamented by spiral lines, two or three of which 

 frequently give the appearance of a sinual band. 



Genotype. — Rhahdostropha grindrodi, Donald. 



Remarks and resemblances. — This subgenus agrees with 

 Loxonema sensu stricto in general form, but is distinguished in being 

 ornamented by spiral lines of irregular strength, two or three of 

 which are frequently more prominent than the others and give the 

 impression of a sinual band. This causes a superficial resemblance 

 to Hormotoma (to which subgenus a specimen of the species Eh. 

 pseudofasciata was erroneously referred by Salter) ; the lines of 

 growth, however, pass over the band without a break, and do not 

 make a tongue-shaped sinus. In ornamentation this subgenus 

 resembles Aclisina ; but it is of greater proportions, and the 

 structure is different. 



Range. — As far as at present known, from the Wenlock to the 

 Lower Ludlow. 



Rhabdostropha grindrodi, Don. 



For description and figure of holotype, see Quart. Journ. Geol. Soc. vol. lxi 

 (1905) p. 565 & pi. xxxvii, fig. 1. 



Remarks. — Since writing that description I have met with 

 another specimen, which is in the Oxford University Museum. It 

 consists of about five and a half whorls and is in fairly good 

 preservation, showing the lines of growth. 



Dimensions. — Its length is 34 millimetres; the width is 

 15 mm. 



Locality and Horizon. — This specimen occurred at Ledbury, 

 in the Lower Ludlow. 



Rhabdostropha psetjdofasctata, Don. (PI. XI, fig. 6.) 



For description and figure of holotype, see Quart. Journ. Geol. Soc. vol. lxi (1905) 

 p. 566 & pi. xxxvii, fig. 2. 



Remarks. — In the Oxford University Museum there is also a 

 specimen of this species. It is embedded in the matrix, and only 

 four whorls are exposed ; these show the lines of growth and some 

 of the spiral striae. Sir Charles Holcroft has a small example, 

 which seems to bear the characteristics of this species. It is 

 remarkable for being very slightly crushed and for possessing ten 

 whorls, a greater number than I have seen preserved in any other 

 specimen. The lines of growth and traces of spiral lines are visible 

 on the penultimate and body-whorls. Besides this, he has five 

 specimens which probably belong here : they are internal moulds, 

 and only two show traces of the lines of growth. 



Dimensions. — The length of the Oxford shell =57 millimetres 

 and the width = about 26 mm. Sir Charles Holcroft's best pre- 

 served example (PI. XI, fig. 6) is 34 millimetres in length and 

 13 mm. in width. The largest of the internal moulds consists of 

 about six whorls, the length of which is 62 mm. and the width 

 about 24 mm. The other moulds have only five whorls, and are 

 slightly smaller. 



