60 COLLECTIONS FROM MELANESIA. 



■with the extreme tips tinged with orange or pink. The ventral 

 surface is peculiarly humpy near the middle, owing to a consider^ 

 able deposit of callus. Figure 43 a represents the dextral outline 

 rather too prominent, and both this and fig. 43 h delineate the shell 

 too broad and the outer lip too thick. 



60. Littorina scahra. 



Linn., PhiUppi's Aibild. vol. ii. p. 221, pi. 6. flg8. 3-7 ; JReeve, Conch. 

 Icon. figs. 21 a-d. 



Hob. Thursday Island, Torres Straits, in mangrove-swamps. 



61. Littorina filosa. 



Sowerhf, Genera Sec. Sf Foss. Shells,, fig. 5 ; Heene, Conch. Syst. 

 pi. 212. fig. 5 ; Conch. Icon. figs. 24 a-c ; Philippi, AhhUd. vol. iii. 

 pp. 46 & 55, pi. 6. fig. 4, and pi. 7. figs. 1, 2. 



Hob. Eoko Island, Endeavour Strait, North Australia, in man- 

 grove-swamps. 



62. Littorina mauritiana, Lamarck. 

 (Var. diemenensis.) * 



Hah. Port Jackson (Coppinger). 



This species is very variable in size, the difference in this respect 

 being the only distinction between the typical form and the variety 

 named L. diemenensis by Quoy and Gaimard (vide Philippi's excel- 

 lent monograph of this genus in the ' Abbild. imd Beschreib. neuer 

 Conch.' vol. ii. p. 195). L. antipodum of Philippi {I. c. pi. 4. fig. 2) 

 and L. acuta of Menke are also small varieties. The European 

 L. neritoides of Linn. ( = Turbo ccerulescens of Lamarck) is considered 

 the same species by Mr. Tenison-Woods (Proc. Linn. Soc. N. S. 

 Wales, vol. iii. pp. 65-72) ; but this determination, I think, requires 

 still further substantiation, and I rather incline with Philippi to 

 retain that form as distinct. Littorina ziczac is a well-known 

 West-Indian species, but is also recorded from the Hed Sea and 

 Kangaroo Island, South Australia, by Philippi, who remarks that it 

 is scarcely separable from L. mauritiana, with the exception of 

 colour and, in most cases, a slight difference in the transverse stria- 

 tion (I. e. p. 165). Mr. Tenison-Woods believes it to be only a 

 variety, but at the same time is not prepared to assert this posi- 

 tively. He also fails to see any specific difference between this shell 

 and L. afrieana (Krauss), Philippi. I should here point out that the 

 shell figured by Eeeve (Conch. Icon. figs. 37 a, b) is not the true 

 PhUippian species, but merely L. mauritiana ; and consequently if 

 Mr. Tenison-Woods based his opinion upon that figure he is certainly 

 correct. L. afrieana is compared by its author with L. neritoides, 

 from which it is said to differ in sculpture, form, and the columella. 



