292 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



p;eneric appellation is tlie S. planorbis, type of the genus." Tlie 

 "■ S. planorbis^' mentioned was based on the T^crbo plunorbis of 

 0. Fabricius, which was considered equivalent to and earlier than 

 Helix depressa, Montagu. 



H. and A. Adams ((jen. Ilec. Moll., vol. i, p. 335, 1854 (March)) 

 retained Shenea for S. plmiorbis, O. Fabricius, writing, " The other 

 small, depressed British shells, usually associated with it . . . 

 roustitute the Belphinoidea of Brown." On p. 405 they placed 

 Belphmoidea, Brown, as a synonym of Cyclostrema, Marryatt, noting 

 " Should the smaller British species require to be separated from the 

 more typical forms, they will take the name of Belphinoidea, Brown". 

 However, later (vol. ii, p. 629, Nov., 1858), they corrected 

 themselves as follows : " According to Dr. Gray, certain of the 

 smaller species of Cyclofitrema, included by Brown in his genus 

 Belphinoidea, are Vitn?iell(S. The name Belphinoidea, however, it 

 would be more correct to add as a sj'nonym of 8kenea, and to transfer 

 the species of Cyclostrenia in question to the genus VitrineUa.'" 



Jeffreys in the Brit. Conch., vol. iii, p. 287, 1865, referred the species 

 to Cyclostrema, save Skenea planorhis oi course, raiacim^ Belphinoidea 

 as " both superfluous and heterogeneous". Jeffreys probably had not 

 the least idea of Cyclostrema, as that would be the last disposition of 

 the British shells to anyone acquainted with the type of Cyclostrema. 



Miss K. Bush (Trans. Conn. Acad., vol. x, July, 1897, p. 100) has 

 given an account of Belphinoidea, citing B. serpuloides (Montagu) as 

 type, and retaining Skenea with S. planorbis (Fabricius) as type. 

 81ie, however, observed that the name Belphinoidea was objectionable 

 as being in use for a higher group in another branch of science. The 

 only conclusion possible is that Skenea must be used for the British 

 shells grouped around Helix serpuloides, Montagu, as type, and this 

 result leaves the platiorbis group nameless. I therefore propose 



Skeneopsis, gen. nov. 

 naming Turbo planorbis, 0. Fabricius, as type. 



The family name will become Skeneopsidse. and Skenea and the 

 family Skeneidae will replace the genus Belphinoidea and family 

 Cyclostrematidae of the Britisli List. I have elsewhere urged the 

 absolute rejection of Cyclostrema, Marryatt, as indeterminable, the 

 type being lost and the species unrecognized. 



Strombiformis, Costa. 



This generic name lias been ignored up to the present, but this 

 laxity can no longer be maintained. The unfortunate construction 

 of the word has in a great measure conduced to this disregard, but it 

 appears that the name was not composed of Strombas (the generic 

 name of certain well-known molluscs) and formis, but was derived 

 from strombus, a needle, and formis. Costa gives as the English 

 equivalent, Needle-shaped shells. If this be borne in mind the dislike 

 to the name may be lessened, si7ice the name must come into comtnon use. 

 It was proposed in the British Conchology, 1778, p. 107, for a series 

 of shells each one of which now bears a later generic name. 



