22 SiDEBOTTOM, Foraminifara from the Island of Delos. 

 PENEROPLIDINiE. 



Peneroplis, Montfort. 



Peneroplis pertusus, Forskal, sp. 



*Var a. planatus, Fichtel and Moll, sp. Very common. 



b. pertusus, Forskal, sp. Rare. 



c. arietinus, Batsch, sp. Frequent. 



d. cylindraceus, Lamarck, sp. Frequent. 



e. lituus, Gmelin, sp. Does not occur. 

 f carinatus, d'Orbigny. Very rare. 

 g. IcEvigatus, Karrer. Rare. 



The above arrangement is taken from Brady ('84), 

 pi. 13, figs. 12-25. 



Brady states in the Challenger work, that " as regards 

 Peneroplis pertusus and its varieties nothing can be more 

 easy than to pick out a number of striking specimens 

 and give to each a distinctive name, but in no other way 

 can they be divided into species," and as regards the 

 Delos forms, var. f may be only the young of var. g., 

 Icsvigatus being in some cases a stout nautiloid form at its 

 commencement, and becoming thin and complanate as the 

 growth enlarges. In these gatherings var. f is never 

 larger than the spiral commencement of var. g. Var. a. is 

 present in great quantity, and is large. Var. d. is often 

 very long, having as many as eleven chambers in the 

 lineal series. Some of the specimens are stout and 

 coarse, and others just the reverse. 



Orbitolites, Lamarck. 

 Orbitolites marginalis, Lamarck, sp. 

 Orbitolites marginalis (Lamk.), Carpenter ('83), p. 20, 

 pi, 3, figs. 1-7; pi. 4, figs. 1-5. O. marginalis (Lamk.), 

 Brady ('84), p. 214, pi. 15, figs. 1-5. 



The specimens are small. Frequent. 



