1879.] NATURAL SCIENCES OF PHILADELPHIA. 21 



absent. Sometimes they are duplicated, or double, and more 

 rarely may be seen rudimentary or secondary denticles besides 

 the normal number. 



Tomatellina oblonga, Pease. 



Tomatellina oblonga, Pease, Proc. Zool. Soc. 18G4, p. 673 Pfeift'er, 



Mon. Hel. vol. VI. p. 264. 

 Tornatellina bacillaris, Monsson, Jour, de Conch. 1871, p. 16, pi. 3, 



fig. 5. 



A common species, ranging from the Marquesas and Paumotus 

 to the 8amoa Islands, and perhaps extends further west to the 

 Viti group. 



Prof. Monsson gives an accurate description of oblonga under 

 the name bacillaris, from Samoa examples collected by Dr. Graffe. 



They are found among dead wood and leaves, and sometimes on 

 the fronds of ferns. They range from near the seashore to 2000 

 or more feet above sea-level. 



Mr. Pease's type specimens were collected at the Society Islands. 



Tornatellina conica, Mousson. 



Tomatellina conica, Mousson, Jonr. de Conch. 1869, p. 342, pi. 14, fig. 



8; 1. c. 1870, p. 128 ; 1. c. 1871 (Var. impressa), p. 16. 

 Cionella (Leptinaria) conica, Paetel, Cat. Conch. Sam. p. 106. 

 Tomatellina oblonga, Pease (Part), Proc. Zool. Soc. 1864, p. 673. 



This species, which is not uncommon, ranges from the Marque- 

 sas to the Viti Islands, and was collected by Dr. Graffe on the 

 low coral islands of Ellice's group in central Polynesia. 



Mr. Pease received from me some of these shells intermixed 

 with oblonga, and supposing the two to be identical he included 

 them in his diagnosis of that species. Since then I have collected 

 thousands of specimens of both species at the various groups ; 

 and have hundreds now before me of all ages, and do not hesitate 

 to pronounce them quite distinct. The shell under consideration 

 I refer to Mousson's conica. His variety impressa is not un- 

 common in S. E. Polynesia. 



As compared with oblonga, it is lighter colored, more robust, 

 the spire more tapering, body whorl larger, and frequently with a 

 marked depression in the middle, which is sometimes slightly 

 concave. The parietal lamina is larger, and the columella more 

 tortuous. 



