Morse.] a2 [March 19, 
I desire to express here my deep gratitude to John E. Gavit, Esq,, 
who has constantly aided me in getting material together in our East- 
port dredgings, who has freely placed at my disposal his extensive 
microscopical apparatus, and who has, by timely suggestions, aided 
me in many ways. 
My thanks are also due to Dr. J. R. Nichols for the constant use 
of a Smith & Beck Binocular; to Dr. Elliott Coues, U.S. A., through 
whose attention and kindness I was enabled to study living Lingula 
on the coast of North Carolina; and to Prof. J. W. Dawson, for 
specimens of Rhynchonella, and for the loan of a stout dredge; and 
to Dr. P. P. Carpenter for accompanying me to the mouth of the St. 
Lawrence, and for aiding me in dredging for Rhynchonella. I am 
also under obligations to Prof. A. E. Verrill, Prof. A. Hyatt, Thomas 
Bland, Esq., and Edward Burgess, Esq., for many favors. 
To the Editors of “ Old and New” I am indebted for the use of 
the engraving which adorns the title page; and to Mr. C. A. Walker 
for the pains taken in engraving my hasty drawings. 
EXPLANATION OF PLATE I. 
Figures 1 to 7, inclusive. Lingula pyramidata Stimpson, natural size, from life. 
Figure 1. Representing two specimens as they appear partially protruding from 
the sand, showing the sand disturbed by them about their burrows. 
Figures 2, 3, 4, 5 and 6, different specimens in various positions after having been 
removed from the sand in which they were found; Figure 3 showing the animal 
while in the act of occillating the dorsal plate; Figure 4, with peduncle straight- 
ened. 
Figure 7. Representing bottom of earthen bowl, in which eight specimens had 
been kept alive in sand; the sand covering the bottom of the bowl an inch anda 
half in depth, above which the Lingulas protruded, and below which they would 
partially disappear with a quick jerk when alarmed. On removing the sand they 
presented the appearance as here given. Sand tubes had been made by them, ad- 
hering to the bottom of the bowl, quite unlike those made by them when free in 
the sand. Into these tubes the Lingulas had partially receded, as represented by 
the figure; a. represents a deserted sand tube. 
Figure 8. Protula media Stimpson, natural size, reduced from a drawing made 
by Mr. Emerton, kindly loaned by Prof. Verrill. 
Figure 9. Showing thorax and left arm enlarged from same drawing; the pec- 
tinated character of cirri are not fully shown. This drawing is inaccurate in not 
showing the calyx or membrane encircling the base of cirri, and in not properly 
showing the pectinated character of the cirri. The correct and beautiful drawing 
of Mr. Emerton’s wili be published by Prof. Verrill in the Proceedings of the Con- 
necticut Academy of Sciences. 
Figure 10. Serpula crater, from Claparéde. 
The last three figures are given to show the distinct separation of thorax and 
caudal portion. 
