FORAMINIFERA OF THE NORTH PACIFIC OCEAN. 3 



of the genera of d'Orbigny. The second species includes species 

 usually assigned to BUoculina, and the third species those belonging 

 to S piroloculina. Thus Goes includes seven of the genera of d'Orbigny 

 under Miliola, and extreme view not taken by even the most radical 

 of the British group of workers along this line. 



Twelve years later in another paper x Goes shows a decided change 

 in attitude. The genera BUoculina and Spiroloculina are recognized, 

 and Miliola contains the other genera. Instead of grouping all under 

 three species, Goes allows 37 species, variously grouped as subspecies 

 and species and describes four new species. Two years later in still 

 another paper 2 Goes recognized also the genus Sigrnoilina of Schlum- 

 berger in addition to those recognized in 1894. One new species of 

 the Miliolidae is described. In this paper, besides Miliolidae, Goes 

 describes over 20 new species and varieties, as well as some new 

 genera. In this last paper, and especially the preceding one, many 

 excellent sections of Miliolidae are figured, showing the stages in 

 development, but little use is made of them. 



To Munier-Chalmas and Schlumberger, especially to the latter, 

 must be given credit for the elucidation of the real structure of many 

 of the generic types of the Miliolidae. Their researches are based 

 upon painstaking work in sectioning great numbers of specimens, 

 both fossil and recent, belonging to this family. Their work was, in 

 the main, the search for and demonstration of the two forms, micro- 

 spheric and megalospheric, in the various species and the basing of 

 generic characters upon definite morphological structure. The imma- 

 ture characters are not as fully dwelt upon as probably would have 

 been done had Schlumberger lived to continue his work. The many 

 new genera Schlumberger described have basis in structure and devel- 

 opmental characters and are restored to their rightful value, although 

 modified somewhat by certain later views as to their scope. Alto- 

 gether the work of Schlumberger is the most valuable work of any 

 student of the Miliolidae as regards the demonstration of Dimorphism 

 (used in the sense of the two distinct generations) in many species 

 and the early stages in the development of various generic types. 



Rhumbler has studied especially the Peneroplis group and the 

 peculiar double forms of Orbitolites. He demonstrated the perforate 

 character of the proloculum of Peneroplis. 



Lister has worked mainly with the Peneroplis group, Peneroplis, 

 Orbiculina, and Orbitolites, as far as the Miliolidae are concerned. He 

 demonstrated the perforate character in the proloculum of the last 

 two genera and has done much work on the dimorphism of various 

 species. 



i A Synopsis of the Arctic and Scandinavian Recent Marine Foraminifera, Kongl. Svensk. Vet.-Akad. 

 Hand]., vol. 25, No. 9, 1894. 

 » On the Foraminifera of the Galapagos Islands, etc., Bull. Mus. Comp. ZoOl., vol. 29, No. 1, 1896,. 



