THE NAUTILUS. 105 



Petricolida, Cooper ellidee^ Isocardiida:, Cardiida;, Diplodontidce and 

 the Leptonacea; in all 145 new tertiary species are described. 



This interesting work on the tertiary fauna contains so many 

 changes in nomenclature that also affect the recent fauna, that it is 

 looked forward to with as much, if not more, interest by the Con- 

 chologist than by the Paleontologist -- the numerous generic and 

 specific references, distribution of species, and synopses of genera, 

 forming a very valuable feature to the student. 



The first family discussed is the Solenida?, which follows closely 

 the synopsis of the recent species, published by Dr. Dall, in the 

 Proc. U. 8. Nat. Mus., XXII, 107, which was reviewed in the 

 NA.UTIJ.US for Feb., 1900. In the Donacidas the synonomy of the 

 two common Californian species is given as follows : 



1. Donax Calif ornica Conrad, not of Carpenter and the majority 

 of Californian authors, nor Deshayes. Donax navicula Hartley. 



2. Donax Icevigaia Deshayes. Donax Californica Carpenter and 

 several Californian authors, not of Conrad or Deshayes. Donax 

 obesa, Gould, not Orbigny. 



The generic standing of the various genera constituting the family 

 Psammol'iiidas are fully discussed ; the following genera being repre- 

 sented : Psammobia, Lam. (Garl of some authors), Sangttinolaria, 

 AmphichffHia, Heterodonax, Asophis, and Tagehis ; regarding the 

 latter Dr. Dall says : " The genus Tagelus is distinguished from any 

 of the Solenidce by its long and distinct siphons." 



A number of changes of familiar specific names have been made 

 in the Semelidcz. For the Semele reticulata L. of authors (S. orbicu- 

 lata Say) the name of S. profcua Pulteney, 1799, is adopted, the 

 reticulata of Linne being based on an oriental species. S. purpur- 

 ascens Gmel. has priority over both obliqua Wood and variegata 

 Lam. S. bellastriata Conrad, 1837, is substituted for canceUata 

 Orb., 1853. Cumin gi a coarctata Sowb. is recorded from Florida, 

 the synonomy being given as follows : Lavtyiwn antillarum and 

 petitiana Orb.; C. fragilis and sinuous A. Ads., and C. tennis II. and 

 A. Ads. 



An extensive discussion of the Tellinidce is followed by descrip- 

 tions of 51 new species. 1 



Of the family Petricolidce, four species are recorded from the 



lr rhis family will be more fully discussed in a review of Dr. Dall's synopsis 

 of the recent North American species. 



