55 



On the olher hand it diffcrs from Cymbiilia parvidentata: 

 i" in having no constriction of the shell, nor the sharply marked angle of the two rows 



which end in the ventral points. 

 2" in the possession of two rows (fig. 90, d) reaching the middle of the shell ; these 



rows do not run so far in Cyinbulia parvidenfata (the figure of Pelseneer is without 



accompan\ing letters). 



II. Of the two specimens of this new species, which were attached to the shell, only one has 

 been very well preserved (in formol 4%). The other is not in a good condition, as the pallial 

 gland was damaged by the influence of alcohol. I have referred to this species the empty 

 shells of the Siboga-material, though most of them are in a bad condition. Among these 

 shells there are some of very small size, scarcely reaching 11 — 12 mm. 



Some specimens of Cyuibiilia, with a ventral lobe to the fin, may be briefly described 

 here. As the shells are wanting, I shall abstain from giving them any specific title. 



A. A form (fig. 91) which bears a ventral lobe proportionnally longer than in Cymbiilia 

 sibogac^ but in every other respect entirely like this species : 



Stat. 99. 6° 7'.5 N., 120° 26' E. i spec. 

 Stat. 245. 4° 16'. 5 S., i30°i5'.SE. 2 spec. 



B. A specimen (fig. 92) in which the dorso-lateral margin of the fin does not e.xhibit the 

 characteristic area without muscular fibres; the width across the wings is only 6 mm. 



Stat. 165. Daram Island. i spec. 



C. Finally a specimen (fig. 93) with the same habitus as Cyinbulia sibogae^ very probably 

 identical with it : 



Stat. 143. i°4'.5 S., 127° 52'. 6 E. i spec. 



Anatomical Rem ark s. 



The study ol the little material at my disposal has given me occasion to note something 

 about the anatomy which does not cjuite agree with former researches. Though my remarks 

 are not complete, I hope to renew hereafter my researches at the Naples Zoological Station. 



The pallial gland is asymmetrical ; the right portion is more developed than the 

 left, though this latter extends more ventrally. The proximal part of the gland is divided 

 by a broad transverse asymmetrical band, which consists of two parts (PI. III, fig. 94, d) 

 The distal portion also exhibits a narrow band (b). M)- description difters a little from that 

 of Pelseneer ^). 



The digestive tract. Two rounded salivary glands are situated just before the 

 radula ; they ma)- be distinctly seen on transverse sections. The oesophagus is strongly 



i) Chall. Rep. LXVI, p. 22, pU III, fig. 8. 



