COCKERELL AND COLLINGE : CHECK-LIST OF SLUGS. 217 



" * . . I ? orifice '57 of total length from head. 

 V. rodcricensis I 



V. sulfurea ... „ „ -5s „ „ 



V. comorensis ... „ „ "59 ,, „ 



V. tiatalensis ... ,, ,, '60 ,, ,, 



V. maura ... ,, ,, "6i ,, ,, 



533. V. schivelyce. Perhaps a variety of V. moreleti introduced. 



535. V. cubensis. Air. Ponsonby has kindly copied for me the 



description of Onchidium cubense, and I judge from it that 

 the slug is not identical with V. occidentalism to which it has 

 been referred. 



Semper has described a slug from Cuba and Jamaica, 

 which he referred with doubt to V. sloanii: I do not think 

 it can possibly be that species, but it may be a variety of 

 my V. dissimilis, with which it agrees in possessing two 

 retractores penis. 



536. V. sloanii. I have been rather perplexed which name to use 



for this slug, but have concluded that sloanii is preferable. 

 The facts, which are not apparently well-known to authors, 

 are as follows : — 



(1.) Sir Hans Sloane found a Veronicella in Jamaica, 

 which he figured very roughly in his work on the 

 natural history of that island. We now know that 

 there is more than one species of this genus in 

 Jamaica ; and there is nothing in Sloane's figure or 

 very short descriptive notes, to prove that he saw 

 one species only, or what species he observed. One 

 might have made a guess, but no absolute certainty 

 would have been possible, I imagine, from Sloane's 

 record alone. 



(2.) Cuvier in 1S17 proposed the name Onchidium 

 sloanii for this slug, giving no description, but merely 

 a reference to Sloane's work. (Regne Animal, ii., 

 410-1 1.) 



(3.) Ferussac (Hist. Nat. Moll, p. 82, pi. 7, figs. 8-9) 

 gave an account of the creature, taken from Sloane, 

 and placed it in Veronicellus. 



(4.) In the meantime (181 7) Blainville described a slug 

 in the British Museum collection as Veronicella 

 Icevis. Afterwards (1825) he called it Onchidium 

 Iceve, being apparently unaware that his genus 

 Veronicella was distinct from Onchidium. 



