224 MR. T. D. A. COCKERELL ON THE [A^pr- 7, 



The genus or subgenus Gigantomilax, Bttg., was founded on a 

 large species from the Caucasus. Lytopelte and Platytoxon are 

 names used for a West-Asiatic group with few species, seemingly 

 intermediate between Amalia and AgrioUmax. 



(5) Eu MI LAX, Bttg. (Paralimax, Bttg.).— Consists of species from 

 the region of the Caucasus and Armenia, with the external appear- 

 ance of Amalia and the dentition of AgrioUmax, but differing 

 obviously from both these genera in tlie anterior position of the 

 respiratory orifice. I have examined specimens of Pa7'alimax inter- 

 mittens, Bttg., and Eumilax brandti, "V, Mts., in the British Museum, 

 and they seem to belong to the same genus. Eumilax, being the 

 prior name, must be used. 



ParmacellincB, 



This subfamily contains only the genus Pai^maceUa, Cuv., which 

 isj perhaps, the most highly specialized of all the Slugs. There are 

 8 supposed species, found in Western Asia, Egypt, Algeria, Morocco, 

 Spain, Portugal, and the Canary Is. 



A subspecies of P. valenciennii, which I described as var. maculata, 

 is found, together with its form olivacea, on both sides of the Straits 

 of Gibraltar. It is interesting that the forms of P. valenciennii 

 found at Gibraltar and Tangier should be identical ; further north, 

 in Portugal and France, the species gradually loses the dark markings 

 on the mantle and becomes spotless. 



Vitrina, Drp., is a testaceous genus characteristic of the Palsearctic 

 and Nearctic regions and the Atlantic Islands. Many species have 

 been described from South Africa and other localities, but until the 

 soft parts of all are known, it will not be possible to say how many 

 may be really referable to Helicarion. Other slug-like genera re- 

 ferred to this subfamily are Vitrinoidea, Vitrinopsis, and Fitritioconus 

 of Semper, from the Philippines, and Parmella, H, Ad., from the 

 Fiji Is. 



Helicarionince. 



I have given a table of the genera of this subfamily in Ann. Mag. 

 Nat. Hist, for Jan. 1891. Their distribution is in many ways 

 instructive. The ZJrocyc/MS-group is very characteristic of, and 

 confined to, the Ethiopian region. 



Estria and Aspidelus, from the Guinea region, are two monotypic 

 genera which may prove identical, or at least only subgenerically 

 distinct. 



Fitrinozonites from the Eastern United States, and Velifera from 

 Costa Rica, represent the subfamily in America. 



Ibycus occurs in the Himalayas, in Siam, and in Java; it also 

 exists in Borneo, if, as I believe, the Parmarion baccarii and P. dories 

 of Issel (which are probably two forms of the same species) are 

 correctly referable to it. Girasia is specially characteristic of the 



