itOLLUaCA OF INDIA. O^ 



probably two forms of the same species) are correctly referable to 

 It. Qirasia is specially characteristic of the Indian region* 

 Mariaella, a very distinct genus, has almost identical forms in 

 S. India, Ceylon, and the Seychelles. Parmacochlea has a sincrle 

 species from the northern extremity of Queensland, but is repre- 

 sented in the Indian region by a subgenus Fseudcmstenia (nov 

 nom.) of Ihijcus the type of which is the Afrlcarion ater of 

 Godwin-Austen. 



As to Mnriaella and its distribution, it has been very clearly 

 shown since 1898, by Cockerell himself, that the habitat Mahe is the 

 place of that name on the S.W. coast of India fVol I n 11 S^ not- 

 Mahe of the Seychelles. ' ' ^' ^' 



It would also have been better not to have selected, out of all 

 the species of (?irrm«, o-ocm as the one having a resemblance to 

 Mariaella in some of its characters ; the type species, G. hookeri 

 would have been a better example for this purpose, because as I 

 have pointed out (Vol. II. p. 223), the radula of Q. crocea differs' very 

 much from that of G. liooUri, whereas the latter is of the same type 

 as m Mariaella. It is interesting to note thiit there is considerable 

 similitude to be found in the teeth of Ibijcus fissidens and G crocea 

 the latter showing a decided approach to the Durgelline type 



Psenclaustenia, Cockerell,= A/Hcarion, G.-A., is made a subgenus 

 of Ibyciis. This I cannot agree with ; I would ask any worker at 

 these forms to compare Heynemann's drawing of the radula of 

 /%m^ with my drawing of the radula of Africanon pallens on 

 l-late ALli. hgs. 6-6 b, which is similar to that of A ater (Vol I 

 p. 244). Again, Parmacochlea, E. A. Smith, of Queensland, is said 

 to be represented by Psendaustenia, i. e. Africarion ater G -A in 

 India. There is a certain likeness in their shells, but'l see im- 

 portant differences in the generative organs and radula which to 

 ray mmd, show these genera to be widely separable. ' 



In several_ minor particulars my Africarion ater A^evs from the 

 African species pallens. Cockerell's name Pseudanstenia will stand 

 well for this South-African form, but it maybe noted that the 

 amatonal organ is absent in both species, 



_ Starting with the view I hold-that the radula of Ihycus fissidens 

 IS very distinctive, m fact of the character found in the subfamily 

 Dnrgellin^e, and therefore that Heynemann's Ibycus for the present 

 certainly should apply to this species aloue,-all those species placed 

 after Ibycus in the ' Check-list of Slugs' must find a location in other 

 genera, there being nothing to show that they are in any respect 

 related to the type species. Among these is Girasia magnifica 

 (Vol. I. p 225), for which Mr. Cockerell has instituted the 

 mh^QTmB Cryptibicus ('The Nautilus,' 1898). This conveys not 

 only the idea of similarity but of relationship, for which there is no 

 support. The adoption of the subgenus becomes of doubtful necessity 

 I am sorry to thus disagree with another naturalist's conclusions.' 



f * M^^-"" fr'-P °^ ^- '"""T' ^■"^•' ^Itbough true Girasia, shows a resemblancs 

 to MarzaeUa m some of its characters. The species which I described ae 

 Girasia depressa I now consider to be a variety or subspecies of G crocea " 

 PART X. 



