1887,] MOLLUSKS OF THE VITI ISLANDS. 1/5 



shell, with a flattened base, 6-7 whorls, the last one obtuse and 

 angulated at the periphery. 



6. Trochomorpha planoconus. 



Trochomorpha planoconus, Mousson, MS., Museum Godeffroy, 

 18S5. 



Sliell umbilicated, trochiform, rather solid, scarcely shining, 

 rugosely striated ; striae rude, irregular, oblique ; colour chestnut- 

 black, varigated with fulvous, gradually passing into dark chestnut- 

 brown ; apex obtuse ; base dark honey-yellow, with a darker line 

 near the keel ; spire elevated, conoid, with plauulate outlines ; suture 

 linear, narrowly margined ; whorls 7, slightly convex, slowly and 

 regularly increasing, last one acutely carinated ; keel compressed and 

 rugose ; umbilicus small, deep ; aperture diagonal, subrhomobidal- 

 luniform ; peristome above the keel acute and gently arched, below 

 the keel thickened and concave. 



Major diam. 19, height 10 millim. 



Ono Island. 



Two examples received from the Museum Godeffroy. As com- 

 pared with T. merzianoides, it is much more conical, darker coloured, 

 smaller, and the umbilicus is not so large. 



7. Trochomorpha fessonia. 



Helix {Trochomorpha) fessonia, Angas, Proc. Zool. Soc. 1869, 

 p. 626, pi. 48. fig. 7 ; Brazier, Proc. Zool. Soc. 187J, p. 322 (part.); 

 Schmeltz, Cat. Mus. Godeif. v. p. 94 ; Pfeiffer, Mon. Hel. vii. 

 p. 201. 



Trochomorpha (Discus) transarata, var. depresso-striata, Mousson, 

 Journ. de Conch. 1870, p. 121. 



I received several examples of this species from Kantavu Island, 

 where Mr. Brazier obtained the type specimens. On trees. Dr. 

 Graffe found it (rare) in the interior of Viti Levu. 



Its most essential characters are its rather small size (12 millim.), 

 depressed trochiform shape, crowded irregular plicate striae, brownish 

 colour, and pale markings. The spire is convexly-ccnical ; whorls 6, 

 with narrow white margins. Base rather flat, corneous, with a 

 reddish-brown band next to the acute white keel. Umbilicus 

 small. 



8. Trochomorpha transarata. 



Helix transarata, Mousson, Journ. de Conch. 186.5, p. 194; 

 Pfeiffer, Mon. Hel. v. p. 183; Schmeltz, Cat. Mus. Godeff. iv. 

 p. 73. 



Trochomorpha (Discus) transarata, Mousson, Journ. de Conch 

 1870, p. 121, pi. 7. fig. I (excl. var.). 



Helix fessonia (Trochomorpha), Brazier, Proc. Zool. Soc. 1871, 

 p. 322 (part.). 



When Prof. Mousson first described this species, he had only a 

 single imperfect young example before him, which Dr. Grkffe 



