On new MoUufihs from South Africa. 237 



XXVII. — D(scn'ptio})s of Nine neio Terrestrial and FluviatiJe 

 Mollusks from Houth Africa. Bv James Cosmo Melvill, 

 M.A., FiL.S., and JoiiN II. Ponsonby, F.Z.S. 



1. Pisidium Langleyanum^ sp. n. 



P. test.a trij^oiio-ovcali, tumida, inccqnilatorali, postice producta, 

 antice brevKcr truncata,oxilissimc concentrico-striata ; iimboiiibus 

 subprominontibus obtusis, dcntibus minutissimis, uormalibus. 



Long. 2^, lat. 3 mill. 



Hah. Port Elizabeth. 



We have the advantage of the liigh corroborative authority 

 of Dr. Clessiu respecting the ch\iras of this little mollusk to 

 rank as a new form of a most obscure and difficult genus. 

 It is perhaps the smallest of all the species. 



2. Ci/clostoma transvaaJense, sp. n. 



C testa conoidea, efFuso-pyramidali, fusccscente, profimde sed 

 angustc umbilicata ; spira data ; anfractibus (juinquc, convexis, 

 duobus ultimis rapide accrescentibus, ad suturas eaiialiculatis, 

 costis transversis regulariter spii-aliter decussatis ; peristomate 

 rotuudato, teuui, contiuuo, baud roflexo. 



Long. 7, lat. 6 miU. 



Hal). Pretoria. 



A beautiful shell, of effuse growth, deeply but somewhat 

 narrowly umbilicate, the suleations on the whorls forming a 

 close, parallel, equidistant series of grooved lines, the inter- 

 stices between which are densely superticially and longitu- 

 dinally lineated, channelled at the sutures j lip thin, con- 

 tinuous, not reflected. 



3. Helix [Dorcasia) narnaquensisy sp. n. 



IT. testa vix umbilicata, globulosa, superficie minutissime longitu- 

 diualiter rugoso-striata, parum nitente, fusco-gilva, tcniii ; anfrac- 

 tibus quinque, ultimo inflate, rotundato, ad labrum submalleato ; 

 columella liievi, albida ; apertura ovata ; peristomate reflexo, albido, 

 margine columellari ealloso, subdilatato ; umbilicum obtegente. 



Long. 30, lat. 27 mill. 



Hab. Namaqualand {Mr. LigJitfoot). 



A distinct addition to the section Dorcasia^ of a form which 

 may very probably exist in collections, in company with the 

 next {H. porphyrostoma)., mixed up with specimens of H. 

 rosacea and globulus (Mlill.), from which it differs by the 

 characters given above. Two specimens in coll. J. H. P. 



