8 CATALOGUE OF 



1836. Held, in his paper on Bavarian Mollusca (77). enumerated 

 Pfeiffer's species and added P. milium. His description 

 of this last is far too scanty for recognition, but Clessin 

 saw the original specimen and depicted it in his Monograph, 

 and since the figure in that work is unmistakable, the 

 name is gladly accepted on his authority. 



1840. Gray brought out an edition of Turton's " Manual " (176) in 

 which he accepted Jenyns' species and added P. cinereum, 

 Alder. Of P. pulchellum he remarked that Jenyns was 

 inclined to believe that his var. j8 and c were " a distinct 

 species for which he would retain the name pulchellum, 

 while I would propose the name of P. jenynsii for the 

 other varieties " (p. 285). That is to say, if the specimens 

 under discussion were really the type examples in Jenyns' 

 collection, one of the worn specimens of P. subtruncatum 

 and the P. milium were to become the types of P. pulchellum, 

 whilst the original type and the other worn example of 

 P. subtruncatum were to constitute P. jenynsii. This 

 forcible exchange of type is not recognized now-a-days, and 

 in the absence of specimens to show what Gray had before 

 him, or that this readjustment was anything more than 

 one on paper, Gray's name must lapse. 



Probably the latter alternative \vas the case, for in 1858 

 (84, p. 105) Jenyns states that Gray proposed the name 

 P. jenynsii for the first of the three varieties of P. pul- 

 chellum (he had evidently forgotten that by inference var. y 

 was included), and adds " but I do not believe now that 

 this variety is .... distinct from the var. (3 of my mono- 

 graph .... The variety which Dr. Gray has, termed 

 jenynsii differs from the more ordinary form of pulchellum 

 by the striae being more deeply cut, and the shell being 

 broader in proportion to its length.'*' 



1842. M oiler published the description (115) of his Cyclas steen- 

 buchii from Greenland. 



1843. Macgillivray in his account of the Mollusca of Scotland (104) 

 enumerates : 



1. P. joannis (n. sp.). 4. P. nitidum. 



2. P. jenynsii. 5. P. pusillum. 



3. P. pulchellum (var. /3, Jenyns). 6. P. amnicum. 



Jenyns, whom he consulted, remarked of the first 

 species : " This I believe to be the P. pulchellum, var. a 

 of my monograph .... which Gray .... proposes should 

 be named P. jenynsii ; but they are much larger than 

 any specimens in my possession before .... If it is not 

 what I suppose it to be, it is new." (104, p. 249.) 

 Macgillivray treated it as such, but unfortunately his spe- 

 cimens have been lost, and since the species cannot 

 be identified with certainty the name will have to be 



