16 ZOOLOGISCHE MEDEDEELINGEN — DEEL IV. 



2. Cyclotus guttatus Pfeiffer. 



Pfeiffer. Proc. Zool. Soc. London, 1851, p. 251. Pfeiffer. Mon. Pneum. Vol. I. 

 p. 91. Pfeiffer. Marti ni-Chemn. Conch. Cab., Ed. II, Mon. Cyclostomacea, p. 333. 

 PI. 43, fig. 15, 16. Tapp. Canefri. Fauna Mal. N. Guinea, p. 249. 



Oinaké, May 31, 1910. 



One specimen is fresh, but of a light, unspotted colour, however in 

 shape and especially by the flat peristome, it agrees with my specimens 

 from Ternate, the other specimen is quite worn, but otherwise alike. 

 They resemble in colour the subsp. codonostomits Mlldff.. but that form 

 has a slightly campanulate outer peristome. 



3. Cyclotus subcanaUcidatus n. sp., PL I, fig. 9. 



Shell depressedly-conoid, strong, largely umbilicated, yellowish, with 

 chestnut flair.es, which are regularly fulgurate on the upper whorls, less 

 so on the last one, which is moreover covered by a brown epidermis, 

 the apex is unicoloured; sculpture consisting of crowded growth-lines; 

 whorls 5, of which about l l l2 form 'a smooth, rather elevated nucleus, 

 the whorls are depressedly-rounded, separated by a deep, slightly canal- 

 iculate suture, descending towards the aperture. Aperture slightly oblique, 

 nearly circular, with a slight angle above, subduplicate, the inner peri- 

 stome being rather inconspicuous; outer peristome a little campanulate, 

 broader at its upper part, much narrower at the rounded base and colum- 

 ellar margin. Umbilicus pervious, showing all the whorls. 



Operculum plurispiral, the inner whorls with a ridge near the suture, 

 outer whorls rugosely-striated, with an irregular, brownish, elevated, 

 suturai rim. 



Diam. maj. 28 alt. 16; apert. alt. and lat. (with peristome) 12 mill. 



Near the S.-coast of the Humboldtbay, May 16, 1910. 



This species is larger than any of the allied ones, is seems to be 

 nearest allied to C. canaliculatus Mlldff. (Proc. Mai. Soc. Lond., Vol. I, 

 p. 238, PL 15, fig. 8), but that species has a diam. of only 15'/ 2 mill. 

 and its suture is deeply channelled. 



Suborder Scutibranchia. 



Bhipidoglossa . 



Fam. Neritidae. 



X e rit i n a Lamarck. 



1. Neritina (Aariculatae) dilatata Broderip. 



Broderip. Proc. Zool. Soc. London, 1832, p. 201. v. Martens. Martini-Chemn. 

 Conch. Cab. Ed. II, Mon. Neritina, p. 29, PI. C, fig. 16—19. 



Faté-river, near the mouth. 



