55 



NEW SPECIES OF TASMANIAN MOLLUSOA, 

 WITH CRITICAL REMARKS ON SEVERAL DE- 

 SCRIBED SPECIES, AND ADDITIONS TO THE 



LIST. 



By W. L. May. 



(Received 20tli June, 1919. Read lltli Augi;st, 1919.) 



Plates XIV.-XVII. 



The species here desicribed include no startling novel- 

 ties, but are more or less closeh^ related to previously 

 known forms. They have come from various parts of our 

 coasts, and fronr low water mark down to one hundred 

 fathoms, and may be described as the balance from several 

 yeari3 collecting left after more striking species have been 

 dealt with. The types of the new species will be presented 

 to the Tasmanian Museum. 



June, 1919. 



Callochiton eloxgatus, sp. nov. 



Shell very small, narrowly elongate, girdle rather 

 broad ; rather elevated ; the valves distinctly beaked. 

 Colour — Purplish-brown, lighter on the dorsal area, giving 

 the appearance of a longitudinal pale band. A co-type has 

 the 6th and 7th valves mostly pale green and the 2nd 

 valve with a large whitish blotch dorsally. 



Anterior valve semi-circular, slightly beaked, covered 

 with minute pustules; median valves with lateral areas 

 distinctly raised, the pleural and dorsal areas are not 

 ssjoarated, except that the low pustules that cover the 

 whole valve become finer and more longitudinal towards 

 the ridge. Tail valve with mucro about one-fourth from 

 the adjoining valve differentiated from the rest of the 

 valve by a small ridge and very slightly elevated. Girdle 

 covered with imbricating, elongated, sharp-pointed ©cales, 

 and similarly coloured to the valves, but of a lighter shade, 

 sometimes with paler blotches. 



Length 7.4 ; breadth, 3.6 mill. 



Habitat. Norfolk Bay and Poit Arthur (E. Mawle). 

 Seven or eight specimens collected. This beautiful little 

 species is a very much smaller and narrover shell than C. 

 jiJatessa, Gould ; C. rufvs, Ashb}- , the type of Avhich I have 

 seen, is broader still. The present species has for its size 

 coarser sculptui-e than p^afessa. It varies much in colour- 



