376 M. C. Lea—Laboratory Notes. 
It is highly probable that the group including this species 
should be separated as a distinct genus from the typical Pen- 
tremites, such as P. Godoni, P. pyriformis, &c. Our decease 
friend, the late Dr. B. F. Shumard, of St. Louis, proposed the 
name Jroostocrinus for a group to which he referred at least one 
on three sides, may admit of some doubts; though Dr. Shu- 
reason why we hesitate in retaining his name for the group 
including our ype, is, that he mentions Pentremites laternijormis 
of Owen and Shumard in such connection with his genus 
that, according to the rule followed by many eminent natural- 
our species belongs, if it can be consistentl done, we have 
proposed, in case serious objections should be raised against 
(To be continued.) 
Art. XXXIL—Laboratory Notes; by M. Carey LEA, 
Philadelphia. 
L. Solubility of certain Silver Salts in solutions containing Sodie 
Citrate. 
SOME statements on this subject appear in our text-books 
which must either be regarded as entirely erroneous, OF else 
must be understood in a very much more limited sense than 
they are expressed. In Storer’s most useful Dictionary of Sol- 
ubilities I find it stated relative to argentic citrate, that “it 1 
