iSgi.] 



THE BRITISH NATURALIST. 



63 



pared the types, and iound parvus much flatter and less deeply umbili- 

 cated, showing much more of the whorls within the outer one, and 

 also less polished. But we thmk that these supposed distinctions Vv'ill 

 scarcely hold good in a long series, and until more information is to 

 hand, it will be best to call the European form P. parvus, var. glaber 

 (^Jeff.J Dr. Jeffreys, the author of glaber, considered it to be Say's 

 parvus. On p. 378, Sphariuiu corneum, var. mceanum (^Kobelt ), is given 

 as fossil at Crayford, having been identified by Dr. Boettger. It is 

 living at the present day in Germany. 



Mr. Ancey thmks we have two species of Acme in Britain. He 

 writes {in litt., Feb. 28) — ^^Acme polita fusca, Walk, and Boys) is 

 quite different from the other species A. lineata. I saw English speci- 

 mens of the latter, although I have none, but no A . polita. The latter 

 I have from Germany, &c. ; but I suppose that MM. Walker and 

 Boys described their shell from British examples." — T.D.A.C. 



Note on Helix Dentoni. — Mr. John Ford, of the Academy of 

 Natural Sciences, Philad., has published and figured in the No. II. of 

 the " Nautilus" a New Guinea form o{ Helix, allied to Helix Tucheri, 

 which he named in honor of the discoverer — Mr. Denton. 



This shell certainly differs from Helix Tuckeri, Pfr. ; the typical 

 locality of the last-named shell being the small island in the Torres 

 Strait named " Sir Charles Hardy's Island." It is distinguished by 

 several particulars, the most striking of which is the continuous cir- 

 cular peritreme. 



In examining this small group in my collection, I find that Mr 

 Ford's species appears to coincide well with another previously de- 

 scribed Trachia, viz. : Helix cyclostoinata, Leguillom I possess speci- 

 mens in my cabinet that I long since separated from H . Tucheri, on 

 an account of the differences mentioned by Mr. J-. Ford. This small, 

 graceful species, which also inhabits one of the small islands (Warrior 

 Island) in the Torres Strait, has been till now confounded with Tucheri. 

 Mr. Fold has probably failed to compare the original diagnosis, and 

 Helix Dentoni is very probably to be added to the synonymy of H. 

 cyclostomata. Leg. Anctus Pilshryi of the same author is synonymous 

 with my B. capueira, Spix., var. laminifera, Anc. 



I must also note that before Mr. Pilsbry's publication of sub-genus 

 Gonostomopsis (for Helix ^aurideus, Rang.) I had given this group the 

 name of Chrysodon, Anc. — C. F. Ancey. 



