1877.] MR. E. A. SMITH ON SHELLS FROM LAKE NYASSA. 715 



or elongate becoming a short line, is situated ou the raised infra- 

 sutural thickening, and beneath this two transverse series, sometimes 

 coalescing and forming a short line. On the body-whorl therele 

 S^Sttl^'^™''^^'^^^^^ also in some ^shells unite S 



6. Melania nyassana. (Plate LXXV. figs. 1, 2.) 

 Shell acutely pyramidal, dark madder-brown, ' thin, somewhat 

 shining ; whorls nine, margined beneath the su ure by a Snc 



wTth flint n Tr f .T'''''i''^ "^°^^ ' '^' ^'^ "PP^r whorls 

 with faint longitudinal ribbing, the rest smooth, with a few distant 



wenrfineT""' 1"-/. only faintly visible on mo^t of the iTo Sbu 

 wel defined around the base of the last ; aperture rather small 



rnSTetZf 7'' Tr""''.' ^'T' ^^^"P^-^" about'ne third'tt 

 bv a tbi ° 1 . '^'" ' '^^ "™^"a arcuate, joined to the outer lip 

 by a tbm callosity overspreading the body-whorl ' 



Length 14 millims. , diam. 4|. 



Far. Shell narrower, more cyhndrical and elongated, the mouth 

 occupying about one fourth of the entire length. Len<.th 2rmil 

 hms., diam. 5| (fig. 2). ° i^euj,cn zu mil- 



This species is very distinct, on account of its dark madder 



be^ath the";„f " ''"If ""^'''™' '^'^'^^ ^^^^ the raised band 

 beneath the suture is generally paler brown. The spiral striaj are 



iusYbe"l "'r.'* '" 'V "PPer whorls, especially near the nM T hut 

 Co^^:et,eZt'''''''' '' ''' '^''^'''^ "^^™'^^^ -^-r^' they' 

 , The variety is represented by a single shell, and in all probabilitv 

 IS an abnormal growth ; for in all respects, with the excS of 

 greater length and more cylindrical form, it is identicaT 



7. Melania nodicincta, Dohrn. (Plate LXXV. figs. 1 1, ] 2 ) 

 Melania nodicincta, Dohrn, P. Z. S. 1865, p. 234. 



Sab. Lake Nyassa (Dr. Kirk). 



8. Lanistes ovum, Peters. 



Bd'f (t841^^2^5'''ST''"''^"l^'^"^,"^""'^ ^'■'''^-' J^hrg. xi. 

 f 9 J - yf' ^1 ' ^^"PP"' in Kuster's Con. Cat. p. 22. pi 6 



by 4: ' -^'' ''"''°^' '" ^^"^^'-'^ ^«^'^'^t^« ConchJl. (n^t seen 

 Hab. Mozambique (Peters). Lake Nyassa (Eir/c), teste Dohrn. 



9. Lanistes nyassanus, Dohrn. (Plate LXXIV. figs. 8. 9.) 

 Lanistes tiyassanus, Dohrn, P. Z. S. 1865, p. 233, 



Two young shells, one about an inch in le'ngth, and the other halt 



that size, were he only ones collected by Mr. Sinions. Bo'h hat 



he spire completely flattened, and a distinct though rather narrow 



oTtlifc2m£cal/o'srt;.^"^^ '''''' ^^^^ ^^^ ' ^^ ^^^S 



