336 Dr. Gwjn Jeffreys on 



lermo (Monterosato). Depths 20-300 fins. Fossil in the 

 older Pliocene of Sicily (Seguenza). 



Specimens vary somewhat in shape, some being more oval 

 than others ; the punctures differ in size, and the rows in 

 comparative distance. The North- American and ' Challenger' 

 specimens represent a smaller, stouter, and shorter form ; and 

 off the coast of Portugal both forms with intermediate grada- 

 tions were obtained in the ' Porcupine ' dredgings. 



This species is the S. lihrarius of Loven, 1846. 



NUDIBRANCHIATA. 



I obtained very few of this order ; and those are widely 

 distributed in northern seas. I subjoin short descriptions of 

 the following three species from my note-book. 



Eolididae. 



Eolis salmonacea, Couthouy. 



£Iolis salmonacea, Couth, iu Bost. Journ. Nat. Hist. ii. p. 08, pi. i. f. 2 

 (1839). 



Body oblong, yellowish-white : head prominent and broad, 

 rounded in front, with small side-lappets or processes : mouth 

 vertical, continually opening and shutting : tentacles 4 ; upper 

 pair longer than the lower ones, serrated or notched at their 

 edges, and retractile,; lower pair contractile, widely separated 

 from the upper pair : eyes very small, sunken and subcu- 

 taneous, placed in front of the upper pair of tentacles : mantle 

 protecting the whole body, and covered with numerous and 

 close-set club-shaped papillas or tubercles, which are arranged 

 down the sides ; these are irregular in size, but become 

 shorter and smaller at the edges of the mantle and at the end 

 of the body ; each papilla has a brown stripe (as- a nucleus) 

 down its centre ; they are retractile, like the upper pair of 

 tentacles ; the extremities or tips appear to be open : foot 

 long, rounded and double-edged in front, contracted and 

 pinched up behind at the vent or tail. Active and hardy ; 

 floats in a reversed position or on its back. 



Station 4, 20 fms. (a young individual). It is of course 

 North- American ; but its range is doubtful. 



The synonymy is very confused. It appears to be the 

 Doris papulosa of Fabricius, but not of Linn^, ^olis papilli- 

 gera of Beck, and jEolidia hodocensis of Moller, not Doris 

 hodoensis of Gunnerus. 



