26 PROCEEDINGS OF THE ACADEMY OF [1879- 



Petit's globosa, from Rapa or Opara is described as having two 

 obsolete plicae in the palate. In micans, perplexa, and nitida we 

 find short plicae or denticles, and frequently rudimentary longitu- 

 dinal lamina. Some specimens of nitida have the latter character 

 as strongly developed as mserrata. Prof. Mousson has described 

 a Viti species under the name of cohnnellaris, which is either the 

 same or very closely allied to nitida, and possesses denticles in 

 the palate. 



If the genus Lameltina is accepted, it should be modified so as 

 to include all the species with either denticles, plicae, or laminae in 

 the palate, though the character on which the genus is based is 

 not, in my opinion, of sufficient importance to rank as generic. 



There are several other species described, from other parts of 

 the world, which possess the same characters. 



Succinea De Gagei, sp. nov. 



Shell ovate, pale to dark-amber color, or ferruginous, thin, fra- 

 gile, pellucid, scarcely shining, more or less rugose with lines of 

 growth ; spire moderately produced, sub-acute, less than a third 

 the length of the shell; whorls 3-3^, convexly rounded, the last 

 large, obliquely produced ; aperture sub-vertical, large, regularly 

 ovate, acute above, sides nearly equally curved, rounded below ; 

 columella thin, gently arched ; peristome acute, regularly curved. 



Length 11, major diameter 7 mill. 



Mr. De Gage sent about 100 examples of all ages: it is the 

 first species recorded from the Austral Islands. 



It is closely allied to Gould's pudo?-ina,a. Tahitian species, but 

 is smaller, less elongate, and the spire is less produced. 



Melampus violus, Lesson. 



Auricula viola, Lesson, Voy. Coquille, p. 342. 



Melampus eaffer, Var. B., Pfeiffer, Mon. Auric, p. 40. 



Melampus viola, Pfeiffer, Mon. Auric, p. 58. 



Melampus eaffer, Pease (not of Kuster), Jour, de Conch. 1871, p. 93 



Schmeltz, Cat. Mns. Godeff. n. 5, p. 88. 

 Melampus violus, Pease, Proc. Zool. ISoc. 1871, p. 477. 



The Rurutu shells received differ none from those I collected at 

 the Paumotus and Society Islands. 



From the above synonymy and references it will be seen that 

 there is some confusion in respect to the interpretation of Lesson's 

 species, which he obtained at Borabora, one of the Society Islands. 



There are only five species of Melampus inhabiting that group, 



