316 , POLLICIPES M [TELL A. 



much farther south, for it was collected during the 

 Antarctic expedition, and 32° was the highest latitude 

 traversed by that expedition. 



Affinities. — This species is closely related to P. cor- 

 nucopia and P. elegans, but differs rather more from them, 

 than these two do from each other. In the capitulum the 

 chief distinctive characters are — the more perfect gradua- 

 tion in size, and the greater number, (taking equal-sized 

 specimens,) of the whorls of latera — the darker colours 

 — the central part of the basal margin of the carina in 

 this species, being considerably excised — the peculiar form 

 of the basal margin of the scuta — and lastly, the scutal 

 margin of the terga being more hollowed out. In the 

 animal's body, the most obvious distinctive character is 

 the uniarticulate caudal appendage. This species agrees 

 with P. elegans, in the presence of the singular elbowed 

 teeth, on some of the spines in the first three pairs of cirri. 



4. POLLICIPES MITELLA. PL VII, fig. 3. 



Lepas mitella. Linn. Systema Naturse, 1767. 



Pollicipes mitella. G. B. Sowerby. Genera of Shells, fig. 2. 



Polylepas mitella. De Blainville. Diet. Sc. Nat. (1824) Plate, 



fig. 5. 

 Capitulum Mitella. /. K Gray. Annals of Philosoph., new 



series, vol. x, 1825. 



P. capitido valvarum unico sub-rostro verticillo instructo: 

 laterum pari superiore {introrsum spectanti) inferiorum 

 magnitudinem ter aut quater super ante: later ibus inferiors 

 bus utrinque obtegentibus ; pedunculi squamarum verticillis 

 densis, symmetrice dispositis. 



Capitulum with only one whorl of valves under the 

 rostrum : the upper pair of latera, viewed internally, are 

 three or four times as large as the lower latera, which 

 overlap each other laterally : scales of the peduncle sym- 

 metrically arranged in close whorls. 



