1891.] GEOGRAPHICAL DISTRIBUTION OF SLUGS. 215 



according to my classification, two of which are usually considered 

 more nearly allied to two of the genera he places in Helicidce than 

 to each other. On the other hand, Simroth ^ uses the family term 

 TJrocydidce for a group which I here place only as a tribe of the 

 subfamily Helicarionince. 



In order to bring the classification of the groups into a condition 

 of approximate uniformity, I have to propose a partly new 

 arrangement, based on the structural characters of the animals, and 

 especially the jaw and lingual membrane. In this arrangement, for 

 the sake of clearness, I have included the testaceous families which 

 are more related to families of Slugs than to each other (see p. 216). 



SucciNEiDiE. — Janellince, 



A very remarkable subfamily, confined to the Australian region. 

 The genera differ in the degree of development of the curious sulci- 

 form grooves on the back. From an examination of some very 

 interesting material in the British Museum, I am able to classify the 

 generic groups more clearly than has been done before. The following 

 genera may be recognized : — 



Aneitea, Gray, 1860. — This seems to be the most highly deve- 

 loped of the genera. The respiratory orifice is situated at the apex 

 of a grooved triangle, the base of which forms part of the dorsal 

 groove. The described species are seven in number : — 



A. macdonaldi, Gray. — New Caledonia, and reputed also to occur 

 in the New Hebrides. 



A. hirudo (Fischer). — New Caledonia. 



A. modest a (Cr. & Fisch,). — New Caledonia. 



A. megalodontes (Q. & G.). — New South Wales. This is the Limax 

 megalodontes of Quoy and Gaimard, from near Port Jackson. It 

 may not belong here ; the description is not very clear. 



A. gr'dffei (Humbert). — Queensland and New South Wales. The 

 British Museum has examples of this large species from Brisbane 

 and Sydney {Challenger Coll.). 



A, hrefftii (Keferst.). — Australia. A specimen in the British 

 Museum is from the head of the Murray River {Sir G. Maeleay). 

 This species is very close to the last, but A. Icrefftii is yellowish-white, 

 while A. graffei is grey and has the triangular " mantle " longer in 

 proportion to its breadth. 



A. scliutei (Keferst.). — Australia. 



Probably the number of species will be considerably reduced when 

 they are better known. Triboniophorus, Humb., is a synonym of 

 A eitea. 



Aneitella, n. gen., type^. mV^ra^a (Smith, P.Z.S. 1884). — This 

 genus, from the Admiralty Is., differs from Aneitea in having only 

 one of the grooves which form the triangular so-called mantle in that 

 genus, namely that running obliquely backwards to the respiratory 

 orifice. The only known species is well described and figured by 



1 Nov. Act. Ac. Caes. Leop.-Oar., 1890. 



