38 THE NAUTILUS. 



closing a dark brown streak on the dorsal keel of the intermediate 

 valves; eye spots with a metallic silvery lustre; anterior valve with 

 seven, posterior with eight notches, the teeth radially striate ; inter- 

 mediate valves with one lateral notch on each side ; interior colora- 

 tion pinkish white with a magenta axial streak ; sculpture much like 

 that of T. crenulata Sowerby, but central areas with much sparser 

 riblets and no defined central smooth area, the sutural crenulations 

 stronger and forming a wider band, the pleural rugae mostly fore and 

 aft in direction, the second valve larger than the rest and with a 

 more conspicuous mesial smooth area. Interior with sinus square 

 not denticulate. Anterior and posterior plates with obscurely radial 

 pustules and very numerous eyes. Length 15, lat. 7, height 4 mm. 

 in the dried animal. 



Noyes Cove, Narborough Island, Galapagos Group, in 20 fathoms; 

 Capt. Noyes. 



This species is clearly of the group of T. crenulatiis but is sepa- 

 rated by sufficiently distinct characters. The brilliancy of the eye 

 spots, each situated in a deep, minute pit, is very remarkable. There 

 are on this small creature nearly 1000 of them. 



PLEISTOCENE MOLLTJSKS OF WHITE POND, NEW JERSEY. 



BY FRANK C. BAKER. 



The Chicago Academy has recently received from Dr. Stuart 

 Weller, Paleontologist of the University of Chicago, a collection of 

 Pleistocene mollusks from the marl bed-^ of White Pond, near Marks- 

 boro. New Jersey. The material consists of about a quart of mixed 

 shells, which, when studied quantitatively, gave some interesting re- 

 sults. VoJvata and Atnmcola made up ninety-five per cent, of the 

 entire lot, the former being forty-five and the latter fifty per cent. 

 Of the remainder, Planorbis hiccn-inatus made up two per cent., 

 Planorhis cumpanulatus one per cent., and the rest of the species the 

 other two per cent. Aplexa was the rarest, there being but two 

 specimens in the entire lot. 



I am indebted to Mr. Bryant Walker for assistance in determin- 

 ing some of the material. The list of species is as follows : 



Pisidium comjjressum Prime. Normal. 



