144 



THE NAUTILUS. 



from wliii-li extend upwards of sixty radial ribs, those of the anterior 



and posterior divaricating toward 

 tiieir respective margins, a few of 

 the upper ones curving upward 

 to the hinge line, the larger ribs 

 iVequently forked near the mar- 

 gin, lines of growth quite promi- 

 nent. Length 15, alt. 8, diam. 

 4 mm. 



Eocene (Lower Claiborne), Berryman's place, two miles northeast 

 of Alto, Cherokee Co., Texas. Type in the Lea collection of the 

 Academy of Niitural Sciences, Philadelphia (Ace. no. 9706). 



This interesting specimen represents both valves intact, the matrix 

 filling the interior is quite hard and the shell so thin that an attempt 

 to develop the hinge would undoubtedly destroy the specimen. I 

 can therefore only refer it doubtfully to the genus Linearia until 

 more material is obtained. 



LINEAlilA UlVAKlCAi'A. 



GENERAL NOTES. 



Occurrence of Zinc in Fulgur In Science for January 29, 



1904, P. 196, Mr. Harold C. Bradley, of Yale University, states 

 that : " In the course of an investigation on the chemical physiology of 

 certain invertebrates^ undertaken under the direction of Dr. Lafay- 

 ette B. Mendel, it was found that the ash of the hepatopancreas of 

 the large carnivorous gastropod Sycotypus canaliculatus contains an 

 element hitherto unobserved in such connection, namely zinc * * * 

 samples of ash from Sycotypus canaliculatus gave approximately 

 eleven per cent, and twelve per cent, respectively of ZnO." 



" At the same time qualitative examinations were made of speci- 

 mens dredged from various parts of Long Island Sound about New 

 Haven and in all cases zinc was found in large quantities in the ash 

 of Sycotypus and Fulgur carica * * * The significance of this 

 unique occurence of zinc in the economy of Sycotypus and Fulgur is 

 still to be determined, as is the nature of the combination in which 

 it exists. These points, together with the distribution of the element 

 in other marine forms about the Sound, are at present being in- 

 vestigated." 



The Senior Editor of The Nautilus is on a collecting trip 

 through Florida and Cuba. He will return the latter part of April. 



