104 PENTADACTYLUS SMITHI. 
compare it with the types in the British Museum. Mr. Smith 
writes, that it is perfectly distinct from P. alveolata, that 
it is allied to Sistrwm (= Morula) affine Pease, but that it is 
more elongate, with more and narrower transverse ridges 
and more elongate tubercles, and that affine has only 4 
granules on the lip. 
2. Pentadactylus (Morula) Martensi, nu. sp. 
= Ricinula siderea Martens (non Reeve). 
Shell elongately or conical ovate, white, with 4 distinct 
and a few accessory rows of brown spots; whorls 6 or 7, 
slightly depressed at the upper part, with radiating ribs, 
crossed by numerous scaly ridges, ribs forming prominent 
tubercles, below the middle part of the upper whorls; last 
whorl with a prominent upper row of tubercles, correspon- 
ding to those of the upper whorls, and a few other rows 
of smaller ones, extending more or less on the intermediate 
spaces; suture waved; number of ribs on the last whorl 
about 8. Aperture small, ovate, yellowish within, outer 
lip thickened, with 7 elongate tubercles near the margin; 
columella excavated, nearly smooth, with only very faint 
tubercles; canal narrow, oblique. 
Length 17, diam. 91/, to 11, length of apert. 9, mill. 
Locality: Red sea. Collected by Mr. Forskal (Leyd. Mus.). 
This shell, according to Prof. von Martens, belongs to 
Ricinula siderea, as described in » Vorderasiatische Conchy- 
lien” pag. 95, and figured Pl. 5, fig. 49. Though I cannot 
see every character named there, a.o. not the upper row 
of spots near the suture, the specimens agree in most 
respects, especially the narrow ones. Prof. v. Martens, how- 
ever, says that he is now doubtful, if his identification with 
R. siderea is right, and that if not, the species should 
receive a new name; thus I sent a specimen to Mr. Smith, 
who declared it to be different from the specimens of siderea 
in the British Museum. 
Rhoon near Rotterdam, September 1892.. 
Notes from the Leyden Museum, Vol. XV. 
