54 



who studied the Mediterranean species. The little material as yet at my disposal has not 

 enabled me to decide upon the question; I, therefore, have restricted myself in figuring the two 

 types only (PI. III, figs. 82 — 87) and to indicate the difference between them, hoping to pubHsh 

 hereafter further researches of my own, in order to make out whether we have to do with 

 two really distinct species or not. 



Pelseneer ') described a second new species of which he had seen the shell only. This 

 shell of Cymbulia parvidentata is distinguished especially by the constriction towards the 

 middle of its length. 



Finally a third species has been caught by the Siboga Expedition. 



I. Cymónlia sibogae n. sp. (PI. III, iigs. 88 — 90). 



Living animals: 



Stat. 165. Daram Island. i spec. 



Stat. 189''. 2° 22' S., 126° 46' E. I spec. 



Empty shells: 



Stat. 148. o°i7'.6S., i29°i4'.5E. 8 spec. 



Stat. 165. Daram Island. i spec. 



Stat. 167. 2°35'.5 S., 131° 26'. 2 E. 2 spec. 



Description: Shell slender, with the dorsal portion very much pointed ; spines on the 

 surface very small and all of nearly the same size, even those which surround the aperture. 

 The rows of spines are arranged in nearly the same way as in the small type of Cymbulia 

 peroni, but the two rows ending in the ventral points do not exhibit the constriction in its 

 middle (compare figs. 87 and 90), being almost straight throughout their length. 



The animal shows very great resemblance with Cymbulia peroni\ I could not observe 

 any marked difference from this species, except in the smaller size. The proboscis, the tentacles, 

 the fins, the foot and the pallial gland (the latter was only preserved in the specimen of 

 Stat. 165) are entirely like the corresponding organs in the Mediterranean species. 



Dimensions: 2 4 — i i mm. 



R e m a r k s : 



I. This species exhibits some characters which are common to both the species of Cymbtilia, 

 actually known. It seems to have close affinity with Cymbulia pcroni (the small type) but 

 is distinguished from it: 



1° by the acute dorsal extremity. 



2" by the straight rows on the aboral surface of the shell ; in Cymbulia peroni these 



rows are more sinuous. 

 3° by the smaller size. 

 4" b)' a shallower sinus at the ventral end. 



I) L. s. c. p. 97, pi. II, figs. 12—13. 



