Notes on the Collection 83 



The allied Mutelidae and Aetheriidae are well 

 represented, among the latter Mulleria dalyi, Smith, from 

 India, noteworthy as being a newly found congener of 

 a remarkable form heretofore known only from the 

 rivers of South America, thus raising most interesting 

 and perplexing questions as to the mode of distribution 

 of this otherwise highly puzzling genus. (See Proc. 

 Mai. Soc. of London, Vol. III. n. s., pp. 14-16.) 



Again is the present linked with the past in the four 

 living species of Trigonia, a family (Trigoniidae) 

 that reached a high development in the Mesozoic seas; 

 and once again in the Nuculidae (Nucula, Leda and 

 Yoldia) whose ancestors of identical lineament are 

 entombed in the Devonian rocks of our own land. 



Here too are the "Noah's Ark" shells (Arcidae) 

 that truly survived the deluge, many fine examples of 

 the genera Area, Barbatia, Anomalocardia, Senilia, 

 Scapharca, Parallelipipedum, Argina, Cucullaea, Pec- 

 tunculus, etc. 



The shell-lover knows that many interesting objects, 

 and many beautiful forms, are to be found in the My- 

 tilidae, the Pinnidae, the Aviculidae and Pernidae, 

 even though to others the names are meaningless. 

 Modiola polita, Verrill and Smith, came from off Catalina 

 Island in 30 fathoms. Two species of Ostraeidae, 

 Ostrea circumpicta, Pilsbry, a new species from Japan, 

 and a very large and beautiful Ostrea folium, Linnaeus, 



