200 EDGAK A. SMITH. 



Manuals of Woodward, H. and A. Adams, Phillipi, Fisclier 

 and Try on, and in the monographs of Solarium by Philippi, 

 Hanley, Keeve and Tryon cannot be used. It first appeared 

 in 'The Synopsis of the Contents of the British Museum/ ed. 

 42, p. 147, published in 1840, in a mere list of names, without 

 any description, and without any species being quoted under 

 it. Under these circumstances it can only be regarded as a 

 no men nudum, and consequently Heliacus of D'Orbigny, 

 published in 1842, in Ramon de la Sagra's ' Hist. Cuba Moll.,', 

 vol. ii, p. QS, must be employed. 



In the 44tli edition of the ' Synopsis,' p. 60, Gray gave two 

 lines of description of the operculum, but did not quote any 

 species ; we cannot therefore know with certainty what shells 

 he referred to, although there is not much doubt that he 

 included the species usually classed under Torinia in the 

 Monographs. However, we can hardly accept the description 

 of an operculum only, as the definition of a genus, when no 

 species is indicated. Moreover, as both Heliacus,^ and 

 Torinia as described appeared in 1842, I think the former is 

 preferable, as it was characterised and a type was mentioned. 



Rissoa farquhari n. sp. PI. VII, fig. 12. 



Testa ovato-turrita, imperforata, succinea, pellucida, spira- 

 liter lirata ; spira turrita, ad apicem obtusa ; anfractus 4| 

 perconvexi, regulariter crescentes, superiores l\ tenuiter 

 spiraliter striati, casteri lirati et sulcati, liris in anf r. penultimo 

 circa quatuor, in ultimo octo ad novem ; apertura parva, 

 ovata, longit. totius ^ ada?quans; peristomium continuum, 

 margine externo vix incrassato, columellari ieviter refiexo. 



Longit. 2, diam. 1 mm. Apertura "75 longa, "5 mill. lata. 



Hab. — Four miles south of Port Elizabeth (J. Farquhar). 



Belonging to the same group as R. vaga,~ R. i«qua,- and 

 others. 



' According to Herruiannseu ' Incl. Gen. Malac.,' vol. i, p. 504, the date of 

 publication of this genus was 1841, Init Mr. Davies Sherborn informs me 

 that it should be 1842. 



' ' Proe. Zool. Soc.,' 1890, pi. xxiv. figs. 15, 18. 



