1666.] 23 [Agassiz. 



of the observations of Chamisso, and have greatly Increased our 

 knowledge of the organization and development of these animals. The 

 observations I have made concerning the early development of the 

 chain and the solitary embryo, are too fragmentary for publication, 

 and I am Induced to give this description of our Salpa in hopes of 

 calling attention to its existence on our coasts, and inducing those 

 who are more favorably situated than I am to develope further this 

 interesting subject. I would also add that this Salpa Is not the only 

 free Tunicate frequenting our coasts ; two species of Appendicularia 

 are extremely common, which have thus far escaped the attention 

 of zoologists ; they are closely allied to A.furcata and A. longicauda ; 

 they both occur In Massachusetts Bay and Long Island Sound, while 

 the Salpa Cabotti has not as yet been found further north than 

 Nantucket. 



BXFLANATION OF FIGUBES AITD LETTEBINQ. 



a. Anterior opening. 



b. Posterior opening, 

 e. Endostyle. 



n. g. Nervous ganglion. 



c.f. Ciliated fossa. 



e. h. CiUated band. 



ch. Small Salpa chain within solitary form. 



g. Gill. 



I. Languet. 



h. Heart. 



n. Nucleus. 



g. t. Gemmiferous tube. 



m. b. Muscular bands. 



c. c. CcEcum of respiratory cavity. 



«. c. Connecting spurs of respiratory cavity. 

 m. Mouth. 



0. p. Odd terminal processes on median line. 



1. p. Lateral processes of ventral side. 



p. p. Pair of terminal processes of posterior extremity. 

 Fig. 1. Solitary form, from the dorsal side. 

 Fig. 2. Solitary form, seen from the ventral side. 

 Fig. 3. Solitary form, seen in profile. 

 Fig. 4. Three quarter-view of the aggregate form. 



Fig. 5. Part of chain of Salpa Cabotti to show the arrangement and connec- 

 tion of the components. 



Dr. A. A. Gould remarked on the habits of the Teredo, or 

 ship worm, which he had found about our ship-yards and in 

 buoys and lobster nets in the harbor. He had discovered 

 several species belonging to two genera, and pointed out 

 their generic and specific differences, illustrating his remarks 

 by drawings ; he hoped at some future time to present for 

 publication detailed statements of their structure. 



