1873.] MR. R. B. WATSON ON MADEIRAN MOLLUSKS. 381 



SrSJ £?° Sant0 « 50 ? th r s ; Funchal B *y> 5 ° feth °™ ; ««. 



Point, oO fathoms. Semifossil in the Canical beds. Teneriffe 



Baron Schwartz von Mohrenstern, in a letter (April 1868) to Mr 

 Gwyn Jeffreys, says of this, « probably a variety of your I £*• 

 With this view Mr. Gwyn Jeffreys does not agreef considering it 

 unquestionably « a new and good species." From R. Sa it Lv 



bi e unS' ,g w U htls eaSlly H beiUg l0ngei and na " 0Werin P-P ^- P * 

 blunter, whorls rounder, suture deeper, base contracted mouth 



quadrangular, p,l ar straight and long, texture of shell and whole 

 system of coloration utterly different. 



The shell it is most liable to be confounded with is a smooth and 

 attenuated variety of R. Hmlis, but that shell has a blunter 



tLZt\lT d fl f er r*> Sph f rather m0I ' e cont ^ed, mouth 

 abo g ve iTl/fl t f 1Ua i raUg K Ular ' aDd b ° th shoulde red and sinuated 

 S,r ls , n ° t 1 flatt « ned °» base > "or angulated at junction of lip and 

 pilar ; shell less glassy ; tip of embryo stained with blackish brown t 

 colour never crimson but always brown, not in minute dot but in 



n"uTre S T5 ?"* °f b **** ° Ut but ne ™ brea ng „ o 

 minute regular dots on base. The white spots, too, are more 

 elongated, more indefinite, being shaded off at edges ; connected too 

 with a system of longitudinal ribs, of which therf is in tha species 

 always some, though often faint, trace P 



marked b^hi^^VT 6 ""^ tW ° S P ecimens of a *»"« 

 marked b } him "n.s.?» but so much bleached as barely to present 



any trace either of the crimson dots or of the white spots" butTl i h 



I am satisfied belong to this species, whence I have added wS 



to the localities where it has been found. J 



Rissoa picta, Jeffreys. (Plate XXXV. fig. 18.) 



Not in M'Andrew's list. 

 ^Z^' ri0 , rgulh0 ' shore; Santa Cri ' z - shore; Seixal, shore- 

 &Tl 8 5°20kth OUth P *¥? SeCC °' ,0 thorns /Piedade 



FuSVatS ; P p lta S 'c Louren§0 ' shore and 45 & th °™ ; 



funchal Bay, 50 fathoms; Porto Santo, up to 50 fathoms. 



wWir^ C ° M f" Wa *," l0nger ' narrow er, more compressed in the 

 whorls, different in sculpture and in colouring 



* ron ? K-nngiUus, which the banded form much resembles it 

 differs in being greatly smaller even than the young of TKSeJ 



£ZiZZZt*l* X °*Z h tV k --^atalf pointed r he 

 extreme point of the base, which that species when young always is • 



SSftHSfc 1 mud ' hi8her p °" the Je aQd '" 



Rissoa concinna, Monterosato. (Plate XXXV. fig 19) 



Not in M'Andrew's list. 



Hab. Gorgulho shore ; Santa Cruz, shore to 15 fathoms ; Machico 



