REPORT <>N THE TUNICATA. 2") 



ANATOMY. 



This section is intended merely as a short account of what is known of the anatomy 

 of the group, without entering into much histological detail. It is considered useful to 

 insert this upon two accounts, firstly, as a means of giving and explaining a complete 

 system of the nomenclature of parts in the group, a matter which has always been 

 involved in considerable confusion ; and secondly, as a basis from which to start in the 

 consideration of the structure of the new genera and species, so that their peculiarities 

 may be more readily noticed and appreciated. 



The minute anatomy of certain special forms (e.g., Culeolus murrayi, see page 91) 

 will be found in their proper places in the systematic part of the memoir. 



Classification. 

 The following is the scheme of classification of the Tunicata which I have adopted : — 



Class— TUNICATA. 



Order I. Ascidiacea. 



Sub-order I. Ascidice Simplices. 

 Family 1. Molgulidse. 

 ,, 2. Cynthiidae. 

 ,, 3. Ascidiidse. 

 ,, 4. Clavelinida;. 



Sub-order II. Ascidice Com/posita. 



Family 1. Botryllidse. 

 ,, 2. Didemnidaj. 

 „ 3. Distomidae. 

 ,, 4. Polyclinida3. 

 ,, 5. Diplosomidse. 



Sub-order III. Asctdiw Salj>ifor»ics. 

 Family Pyrosomidse. 



Order II. Thaliacea. 



Family 1. Doliolida-. 



,, 2. Salpida-. 



Order III. Lakvacea. 



Familj Appendiculariidae. 



(zool. aiALL. Exr.— pakt XVII. — 1882.) B 1 



