136 THE NAUTILUS. 



the type of the genus Maculopeplum Dall, 1906. Busycon eliceans 

 is at most only a variety of carica. In using Janthina janthina 

 Linn. /. communis Lam. becomes a synonym. The species 

 showalteri ia left in Neritina. There are various misspellings 

 such as Apicinca for Apicina, Epitomium for Epitonium, Petro- 

 irochus for Perotrochus, etc. C. W. J. 



FINAL REPORT ON THE STUDY AND APPRAISAL OF MUSSEL RE- 

 SOURCES IN SELECTED AREAS OF THE UPPER MISSISSIPPI RIVER. 

 By N. M. Grier (Amer. Midland Nat., Vol. 8, pp. 1-33, 1922). 

 An interesting paper on the economic problems of the mussel 

 fisheries. A may showing the various areas considered is given. 



THE LIFE OF THE PLEISTOCENE OR GLACIAL PERIOD. By 

 Frank Collins Baker (Univ. 111. Bull. 41, Vol. 17, pp. 1-476, 

 pis. 1-57). This great work on the " Life of the Pleistocene ' 

 was begun about nine years ago when a drainage canal called 

 the North Shore Channel was being excavated; all of the ex- 

 posures in this as well as those of the Calumet-Sag Channel 

 were carefully studied. The study of the Chicago region led to 

 the consideration of other regions once covered by the great ice 

 sheet, and the results of these studies are embodied in this vol- 

 ume. There is a most exhaustive study of the life of the old 

 bed of glacial Lake Chicago, with a chapter on the post-glacial 

 biota of the great lakes region and pre-glacial conditions and 

 life. The various ice invasions and a summary of the life of 

 the Pleistocene is followed by a full bibliography. C. W. J. 



ON THE CEPHALOPODA obtained by the Percy Sladen Trust 

 Expedition to the Indian Ocean in 1905. By G. C. Robson. 

 Trans. Linn. Soc. London, XVII, pt. 4. The most interest- 

 ing form is a very minute Benthoteuthid about 9 mm. long, but 

 believed to be adult, for which the new genus Chunoteuthis is 

 proposed. 



NEW EOCENE SPECIES FROM ALABAMA. By T. H. Aldrich 

 (Bull. Amer. Paleont, IX, No. 37). Many new species had 

 one new genus, Tenuiacteeon. 





