232 Mr. E. A. Smith on the Genus Pytliiua. 



12. PytJiina striatissima^ Sowerby. 



Pythina stnatissitna, Sowerby, Proc. Zool. Soc. 1865, p. 517, pi. xxxii. 

 fig-. 7. 



Hah. Borneo. 



This species has only a single anterior cardinal tooth in 

 each valve, no posterior teeth or laterals. The internal liga- 

 ment is oblique and posteriorly inclined. 



Its position, judging from the dentition, is certainly with 

 Montacutay and not with Pythinn { = KeIli'a), tlie hinge of 

 which is quite different. This apparently is another instance 

 in which the general form of the shell has influenced the 

 describer in locating it. 



13. Pythina gemmata^ Tate. 



Pythina gemmata, Tate, Trans. H. Soc. S. Australia, 1878, vol. ii. p. 13:2, 

 pi. V. fig. 8. 



llah. Shell-sand, Fowler's Bay, Soutli Australia. 



This species is based on two minute right valves only, 

 about 21 millim. in length, and it is possible they represent 

 merely the young of some species which attains larger dimen- 

 sions. It is sculptured with radiating granulous lines, some- 

 what like P. striatissi'jna, but of course is generically distinct 

 from that genus on account of the difference in the hinge. 

 This is described by Tate thus : — " Right valve with a bifid 

 cardinal tooth in front of a ligamental pit, laterals one on 

 each side stout and elongated." 



From this description it does not seem to correspond 

 exactly with Pythina, but in my opinion more nearly 

 approaches Mylitta ; but without an examination of speci- 

 mens it would be unsatisfactory to hazard a definite opinion. 



14. ^^Pythina setosa, Dunker," JefTreys. 



Pythina setosa, Dunker, Jeffreys, Proc. Zool. Soc. 1881, p. 693. 



Dr. Jeffreys is altogether wrong in his identification of 

 this species, which was correctly described by Dunker as a 

 Coralliopliaga {vide Grube's ' Insel Lussin und ihre Meeres- 

 fauna/ 1864, p. 48). He states that it " belongs to Pythina 

 in respect of the hinge as well as of the peculiar divaricating 

 structure," and he gives as synonyms Kellia Macandrewi, 

 Fischer, Scintilla recondita, Fischer, and 8porfeUa Caillati, 

 Conti. The last two I do not know; but with regard to the 

 first, I may observe that it has not the remotest resemblance 

 to Dunker's species. This is a true Voralliophaga, has no 



