rORAMINIFEEA OF THE KERIMBA AECHIPELAGO. 601 



He makes two species, M. sollasi, which he figures with a compressed spiral initial 

 portion, followed by a series of subglobular chambers, and a terminal orifice with 

 everted margin ; and another species, M.poUta, which he describes as " test imperfect, 

 but probably similar in general outline to M. sollasi," with the exception that the 

 segments are more irregular in form. The rectilinear portion of the shell, "the only 

 part discovered at present," consists of six subcylindrical and irregular segments, 

 aperture with an everted margin. From this description it would appear that 

 Chapman also believed his specimens to be merely fragments of a spirally commencing 

 shell. The Kerimba individuals agreeing in all other respects with Chapman's 

 diagnosis, and occurring in considerable quantity, leave no doubt in our minds that 

 the organism is specifically devoid of any spiral commencement whatever. 



We therefore consider that Chapman's subgenus Monalysidiuin should be modified 

 to include these rectilioear forms only, and that the spirally commencing M. sollasi 

 should be referred to the genus PeneropUs. 



112. Peneroplis pertusus (Forskal). 



Nautilus pertusus ForstSl, 1775, Descriptio aniraalium, p. 125. no. 65. 



„ planatus, var. «, Fichtel & Moll. 1798, TM. p. 91, pi. xvi. a, b, c. 

 Peneroplis proteus Schacko, 1883, UF. p. 443, pi. xii. 



„ pertusus Brady, 1884, FC. p. 204, pi. xiii. figs. 16, 17. 

 „ Mobius, 1880, FM. p. 78, pi. iii. figs. 9-12. 

 Egger, 1893, FG. p. 247, pi. iii. fig. 30. 

 „ „ Rhumbler, 1894, PP. 



Chapman, 1900, FLF. p. 179. 

 „ „ Winter, 1907, PP. 



15 Stations. 



Occurs at nearly every Stn., but does not attain any very large size and is seldom as 

 abundant as its more outspread relative, P. planatus. The best specimens were at 

 Stns. 2 a and 6. Good specimens and some deformities at Stn. 1. Poorly developed 

 at Stn. 4 and very rare at Stns. 5, 7, 9, 1 X and \ B. Both the involute and evolute 

 types occur, generally together. 



113. Peneroplis planatus (Fichtel & Moll.). 



Nautilus {Lituus) arietinus (pars) Batsch, 1791, CS. p. 4, pi. vi. fig. 15 a, b. 



„ planatus, var. /3. Fichtel & Moll. 1798, p. 91, pi. xvi. fig. 1. 

 Peneroplis lanatus* Montfort, 1808-10, CS. vol. i. p. 258, 65me genre. 

 „ planatus d'Orbigny, 1826, TMC. p. 285, no. 1, Modele no. 16. 



„ Brady, 1884, FC. p. 204, pi. xiii. fig. 15. 

 „ „ Tempera, 1897, FCF. p. 23. pi. iv. fig. 17. 



* Doubtless a misprint for planatus, as Montfort gives the F. & M. reference. His French equivalent, 

 Penerople aiimusse, refers to the ecclesiastical fur cap or bonnet (suggested bj' the shape of the shell), which 

 has survived to the present day, though the amice, properly speaking, was more in the nature of a hood and 

 collar, and is now represented as a short vestment. 



4q2 



