140 PROCEEDINGS OF THE ACADEMY OF [1887. 



one of an orange-brown with three chestnut bands. The spire is 

 marked with minute radiating grooves which are very faintly ex- 

 pressed or very conspicuous, sometimes covering the whole spire or 

 only visible at the apex. Length 11 to 14 mill. 



M. parvulus, Nuttall. 



Melampus parvulus, Nuttall, MS., Pfeiffer, Syn. Auric, no. 11; 

 Mon. Auric, p. 24. H. and A. Adams, Gen. Moll., ii, p. 243. Pease, 

 Proc. Zool. Soc, 1871, p. 477. Martens and Langk. Don. Bism., p. 

 56, pi. 3. fig. 10. Paetel, Cat. Conch., p. 114. Brazier, Quar. Jour, 

 Conch., i, p. 247. 



Common on the margins of mangrove swam})s. Also common in 

 the Tonga and Viti Islands. Mr. Nuttall obtained the type speci- 

 mens at the Sandwich Islands. It not only inhabits New Caledonia 

 but ranges west as far as Torres' Strait, where it was found by Mr. 

 Brazier. 



The Samoa specimens which are a little smaller than Nuttall's 

 type, differ none from the latter except having one or two more 

 denticles or plicse on the parietal region, and the base is more dis- 

 tinctly, impressly striated, It may be I'ecognized by its ovate shape, 

 smooth shining surface, dark-chestnut, or olive brown color, short 

 convexly conoid spire and mucronated apex. On the lower portion 

 of the parietal region may be observed two approximating folds, the 

 lower one the smaller and occasionally wanting. There are usually 

 one or two small denticles above, and the palate has 5 to 7 laminae. 

 The columellar fold is continuous with the basal portion of the per- 

 istome. Length 7-9 mill. 



M. Tongaensis, Mousson. 



Melampus Tongaensis, Mousson, Jour, de Conch., 1871, p. 22, pi. 

 3, fig. 8. Schmeltz, Cat. Mus. Godefi"., v, p. 88. Pfeiffer, Mon. Pneum. 

 (Auric), iv, p. 31d. 



A few examples found in the same station as the preceding species. 

 Common also in the Tonga and Viti Islands. 



Very closely allied to, and perhaps only a form of 3f. parvulus. 

 It is about the same size and color, but is a little more oblong and 

 the spire is more produced. The fold and dentition is the same in 

 the two species. 



M. semisulcatus, Mousson. 



Melampus semisulcatus, Mousson, Jour, de Conch., 1869, p. 347, 

 pi. 15, fig. 2, Paetel, Cat. Conch., p. 1 14. Schmeltz, Cat. Mus. Godeff"., 



