Mr. Thompson on the Mollusca of Ireland. 97 



from mine. Philippi at the same time quotes the /. prolon- 

 gatus in Payraudeau as identical with his, which in colour, 

 " pallide violacea," is similar to the Irish specimens, hence 

 named pallida. This author again refers to what Blainville 

 figures as one of the forms of I.fragilis (Malac. tab. 37 bis. 

 fig. 1.) for a representation of his /. nit ens. Philippics dia- 

 gnosis of this species is, " Testa ovata, obtusa, anfractibus 

 omnibus valde rotundatis, sutura profunda divisis, apertura 

 semiovata. labro profunde exciso angulo columellae cum labro 

 acuto." Habitat, Sicily. Size of Irish specimens, 11 lines 

 long, 8 1 broad. 



The genus Ianthina is in much confusion, which the pre- 

 sent notes tend in no way to clear up: they are only intended 

 to introduce a third species of this attractive genus to the 

 British Fauna. 



Rissoa Harveyi, mihi. Cingula sculpta, Harvey* s MS. PI. II. 

 fig. 11. 



This species — two lines in length — is most nearly allied to 

 the R. excavata, Philippi, (Enum. Moll. Sicil., p. 154. tab. 10. 

 fig. 6), the following description of which, with the mere sub- 

 stitution of the numbers between the brackets, is equally 

 applicable to R. Harveyi. 



" Rissoa excavata, mihi, tab. x. fig. 6. 



" R. testa oblonga, obtusa, alba, anfractibus superne angulatis, 

 medio concavis, longitudinaliter costatis, ultimo inferne cingulis 

 tribus transversis elevatis instructo, apertura ovata simplici [costae 

 circiter 12 (24) in quovis anfractu* superne et inferne angulatse.] 



" Testa minuta, 1'" longa (2), oblonga, anfractibus 4 — 5 (6), apice 

 obtuso ; apertura ovalis superne vix angulata, labrum simplex." 

 Mouth not so large as in R. excavata. 



This shell was discovered at Miltown Malbay (county of 

 Clare), by Mr. W. H. Harvey, some years ago, and charac- 

 teristically named by him C. sculpta; the term insculpta 

 being applied to a species of the allied genus Odostomia, has 

 induced me, perhaps unnecessarily, to change the name. 

 The species is dedicated to its discoverer, who had success- 



* My species shows the necessity of making this part of the diagnosis: 

 the words used are Philippi's, and taken from his general description. 



