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Show 1891] GEOGRAPHICAL DISTRIBUTION O F 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, Simroth1 uses the family term Urocyclidce 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). SUCCINEIDJE.-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, I860.-This seems to be the most highly developed 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. modesta (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. grdffei (Humbert).-Queensland and New South Wales. The British Museum has examples of this large species from Brisbane and Sydney (Challenger Coll.). A. krefftii (Keferst.).-Australia. A specimen in the British Museum is from the head of the Murray River (Sir G. Macleay). This species is very close to the last, but A. krefftii is yellowish-white, while A. grdffei is grey and has the triangular "mantle " longer in proportion to its breadth. A. schutei (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 A. virgata (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. Cses. Leop.-Oar., 1890. |