396 



DR. W. T. CALMAN ON 



lemainder of the svirface of the blade is chalky white, and the- 

 material composing it envelops the distal end of the more trans- 

 lucent stalk and ends in a sharp irregular line*. 



The valves of the shell in h.11 the specimens I have examined 

 show, to an unusual degree, the effects of secondary absorption 

 already referred to. This is marked, not only in the dorsal 

 region, posterior to the articular knobs, as in the valves of more 

 normal Teredinidse, but along the whole of the posterior margin 

 as far as the ventral articular knob. In most specimens the 

 whole region of the auricle has disappeared and the greater part 

 of the postero-median region. In some specimens, as in the 



Text-figure 3. 



Teredo mannii (Wriglit), from Brisbane. 



Valves of shell. A. Right, R. Left valve of a specimen in which the eroded area 

 (seen in B) onlj' occupies the upper margin, while the lower jiart of the 

 auricle still persists. C. Right valve of a specimen of about the same 

 size in which the erosion extends down the posterior margin as far as 

 the lower point of the shell and the auricle has been entirely removed. 



holotype, this latter region is represented by a narrow border 

 along the greater part of the hind margin ; in one of the 

 specimens figiu'ed (text-fig. 3, C) it has been entirely removed 



* The extremely close resemblance, pointed out by Wright, between the pallets 

 of this species and those of KujyJms arenarins as figured by J. E. Gray is very 

 surprising, if the statements as to the widely different habitat of the last named 

 species are correct. 



