32 



To such a temporal enlargement of the efferent duet one must refer, to my opinion, 

 the "appendice coecal" of Souleyet ^). Once I too found in this species something of the 

 kind. Like Pelseneer, I did not find in Clio (Creseis) acicula the receptaculum seminis, figured 

 by Gegenbaur"); I noticed, however, at the "Uterusdrüse" an organ in a similar disposition, as 

 the receptaculum seminis displays in the ether species (PI. I, fig. 19). 



In Styliola this receptaculum seminis is more slender (PI. I, fig. 20), while it is rounded 

 in Hyalocylix and Cllo (s. str.J. The accessory genital glands are generally very much hardened 

 in spirit-specimens. 



The central nervous system has been accurately described by Pelseneer '), and I agree 

 with hini in almost every respect. The cerebral and pedal ganglia are symmetrical as in Limacina, 

 but this is not the case with the visceral ganglia, the left portion being larger than the right 

 one. According to Pelseneer, this asymmetry is " particularly prominent" in Creseis \ I found 

 it, however, scarcely indicated in Clio (Creseis) acicula (PI. II, fig. 21). In this species, as 

 in Clio pyramidata, particularly examined in this respect, I noticed a small second pedal 

 commissure. (PI. II, figs. 21 — 22). 



I have seen only one tentacular nerve (PI. II, fig. 22), but I have no doubt, that two of 

 them really exist, as in Liinacitia. I shall not remark anything about other nerves, issuing 

 from the ganglia ; they are shown in the figures. 



The buccal ganglia are united by a rather strong commissure to the cerebral ganglia 

 (PI. II, fig. 23) und form a single mass. 



Cuvierina Boas. 



1824. Cleodora (part.) Qoy et Gaimard, Voyage de l'Uranie, Zoölogie, p. 145. 



1824. Triptera Auctorum. 



1827. Ctivieria Rang, Description de deux genres nouveaux appartenant a la classe des 



Ptéropodes, Ann. d. Sc. Nat., sér. i, vol. XII, p. 322. 

 1886. Ciivicrina Boas, Spolia atlantica, Bidrag til Pteropodernes Morfologi, etc. p. 131. 



I. Cuvierina columnella (Rang). 



1824. Cleodora obtnsa Qoy et Gaimard, Voyage de l'Uranie, Zoölogie, p. 145, pi. LXVI, fig. 5. 

 1827. Cuvieria coliunndla Rang, Description de deu.x genres nouveaux, etc, Ann. d. Sc. 



Nat., sér. i, vol. XII, p. 323, pi. XLV, figs. 1—8. 

 1835. Cuvieria oryza Benson, Corrected characters of the genus Cuvieria, and Notice of a 



second species inhabiting the tropical Indian Ocean, Journ. Asiat. Soc. Bengal, 



vol. IV, p. 698. 

 1839. Cuvieria obtusa d'Orbigny, Hist. nat. des Canaries, Moll., p. 32. 

 1850. Triptera colniiinclla Gray, Catalogue of the Mollusca in the Collection of the British 



Museum, prt. II, Pteropoda, p. 23. 

 1850. Cuvieria urceolaris Mprch, Catalogus conchyliorum quae reliquit C. P. KjERULF, 



Hafniae, p. 32. 



1) Voyage de la Bonite, vol. II, p. 171, note i, pi. XI, fig. 7, z and ;'. 



2) Op. S.C. pi. II, fig. 3. 



3) Op. s. c. p. 15—16. 



