160 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
not prepared to say. Dr. William Stimpson, in writing of T. 
conradi, says, "The absence of an ossiculum in this species would 
seem to separate it generically from other Thraciae. But the 
animal resembles so closelj^ that of the large English species which 
possesses the ossiculum that I have thought it best to consider 
the appendage unimportant." While the absence of an ossiculum 
would hardly constitute a generic distinction the syphonal collar 
so firm and sharply defined might be considered of generic value. 
No allusion to such a structure in Thracia can be found in Forbes 
and Hanley or Clark's Testaceous Mollusca. If on these hints 
any taxonomist is inclined to make a new genus of this species 
I suggest that he embodies the name of Couthouy. 
ANDORA TRILINEATA Conrad. 
Fig. 17. Length, 29 mm. 
The syphons are very short and united. Thej^ protrude from 
the shell close to the dorsal edge where the shell contracts to 
form a posterior rostrum. The animal varies in color individ- 
FiG. 17. — Pandora trilineata Conrad. 
