82 COLLINGE : ANATOMY OF SLUGS. 



internal structure of Bergh's T. angtraJis and the specimens from the 

 Hawaiian Isles and from Chekiang all agree internally with the descrip- 

 tion given by Keferstein. The only difference externally in the " Chal- 

 lenger" specimens from any others I have seen of T. hilmeatus, is 

 the presence of a number of black markings on the dorsum which 

 tend " to form oblique lines running centrally backwards," this, how- 

 ever, I think is only a variation. 



T. formosensis, Ckll. 



Two specimens in the British Museum from Formosa, have been 

 termed by Cockerell T. forinosensU, but until structural differences are 

 given these must be referred to T. hilineatus, Bens. Heynemann (ii) 

 has recorded this last mentioned species from Formosa. I fail 

 entirely to see why these Formosa specimens have been separated 

 from Benson's species, for Cockerell himself states that compared with 

 the Chusan specimen they " do not seem specifically different so far 

 as external characters go." At first, he states, he was inclined to 

 regard it as a geographical race of T. confusus, but not having exam- 

 ined the jaw he could not be certain, further seeing that T. hilineatus, 

 Bens., has been found in the Chusan Islands it is " highly probable 

 that the Formosa form has a ribbed jaw and is allied thereto" (5, p. 



385)- 



T. campestris, Godwin-Austen. 



Five specimens in the British Museum from Dukhun have been 

 referred by Cockerell to this species. Godwin-Austen's original figure 

 is not very clear,* but if these five specimens are the same as his T. 

 campestris, I can only, in the absence of any account of the internal 

 structure of campestris, regard it as another synonym of T. hilineatus, 

 Bens. 



T. chinensis, Ckll. 



A specimen in the Museum taken 1300 miles up the Yang-tse 



River, China, has been named by Cockerell T. chinensis. It is very 



like one of the small specimens of T. australis, sent me by Dr. 



Jenson. 



T. bilineatUS, Benson. PI. iv, figs. 3—5, pi. v, fig. 14. 



Incillaria hilineata, Bens., 1842, Ann. and Mag. N. H., vol. ix, 



p. 486. 

 Philomyciis (Incillaria) hilineatus, Kef., 1866, Mai. Blatt., Bd. 13, 



p, 64, T. i, figs. 5—9. 

 Philomycus australis, Bergh, 1870, Verhandl. Zool. Bot. Gesell., 



Wien, Bd. xx, p. 863. 



* Journ. Asia. Soc. Bengal, 1S76, vol. xlv, pi. viii, fig. 3. 



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