NOMENCLATURE. 7 



other authors) the ovigerous Lamella ; they are united to 

 two little folds of skin (PL IV, fig. 2/), which I call the 

 ovigerous Frcena. 



From the peculiar curved position which the animal's 

 body occupies within the capitulum, I have found it far 

 more convenient (not to mention the confusion of nomen- 

 clature already existing) to apply the term Rostral in- 

 stead of ventral, and Carinal instead of dorsal, to almost 

 all the external and internal parts of the animal. Cirri- 

 pedes have generally been figured with their surfaces of 

 attachment downwards, hence I speak of the lower or 

 Basal margins and angles, and of those pointing in an 

 opposite direction as the Upper ; strictly speaking, as we 

 shall presently see, the exact centre of the usually broad 

 and flat surface of attachment is the anterior end of the 

 animal, and the upper tips of the Terga, the posterior 

 end of that part of the animal which is externally visible ; 

 but in some cases, for instance in Coronula, where the 

 base is deeply concave, and where the width of the shell 

 far exceeds the depth, it seemed almost ridiculous to call 

 this, the anterior extremity ; as likewise does it in 

 Balanus to call the united tips of the Terga, lying deeply 

 within the shell, the most posterior point of the animal, 

 as seen externally. 



I have followed the example of Botanists, and added 

 the interjection [!] to synonyms, when I have seen an 

 authentic specimen bearing the name in question. 



Every locality, under each species, is given from spe- 

 cimens ticketed in a manner and under circumstances 

 appearing to me worthy of full confidence, — the specific 

 determination being in each case made by myself. 



