1873.] MR. R. B. WATSON ON MADE1RAN MOLLUSKS. 383 



(not below) the suture, but best of all by the spiral striae on em- 

 bryonic whorl and by the dark point on the tip. In this respect 

 it resembles R. novarensis aud R. canariensis, but cannot possibly be 

 confounded with them. 



1 have felt the greatest hesitation in the identification of this 

 species. After examining a specimen of Cinyula maculata, Mont., 

 kindly sent me by the Marquis de Monterosato, I was on the whole 

 persuaded that his species and mine from Madeira are really the 

 same. But maculata is a specific name already appropriated by 

 Brown to R. inconspicua, a fact which makes it an undesirable one 

 for another species unless there be no escape. But is Manzoni 1 s 

 name, which I have adopted as being earlier, really preferable ? As 

 to his description I am really unable to say what it suits, as his 

 R. callosa and R. depicta want individuality ; and the specimens 

 kindly sent me by Mr. M'Andrew of these two species have not 

 helped me much. Still, on the whole, from the descriptions and 

 from the specimens, I infer: — first, that there are two species to be 

 identified ; secondly, that among specimens in my possession bearing 

 the names of the two species are some specimens which most pro- 

 habhj belong to the same species as my specimens from Madeira 

 (which I had proposed to call R. punctifera, from their black-pointed 

 tip). Hence I infer that this is probably the species which Manzoni 

 meant to describe under the name R. depicta, and that the name in- 

 dicates the bleached condition of the specimens which served for his 

 description — a fact which will explain his statement that the species 

 is "depourvue de toute espece de taches." In the end, it has been 

 for me a choice of evils ; but a mistaken identification, if it should 

 so prove, is less injurious than a false manufacture of a new species. 

 I therefore, noting the difficulty, call my Madeiran species by the 

 name of Manzoni' s species from Teneriffe, leaving at the same time 

 my MS. name in case it should ultimately be wanted. 



Rissoa ptjlcherrima, Jeffreys. (Plate XXXVI. fig. 21.) 



Not in M 'Andrew's list. 



Hab. Gorgulho, shore; Santa Cruz, 10-15 fathoms; Machico, 

 10-15 fathoms ; Piedade (Canical), 15-35 fathoms ; Ponta S. Lou- 

 renco, 25—15 fathoms ; Funchal Bay, up to 50 fathoms ; Porto 

 Santo, up to 50 fathoms. 



I give this species as R. pulcherrima on the authority of Mr. Gwyn 

 Jeffreys ; but for his judgment and in the absence of actual speci- 

 mens I should have found the descriptions and figures, so far as I 

 know them, too unlike the Madeira form, which is smaller, longer 

 and narrower, contracted at the mouth, and with an open shallow 

 suture. 



Rissoa perminima, Manzoni. (Plate XXXVI. fig. 22.) 



Shell conic-oval, short, thinnish, with a suffused brown horny 

 transparency. 



Sculpture smooth, with close-set slightly bent microscopic lines of 

 growth. 



