240 JEOLTDID^. 



cal with the Linnean species of Europe. Variations in the number 

 of papillae depending on age have also added to the confusion. It 

 is sluggish in its movements, but very tenacious of life. 



The eggs are excluded in a white, gelatinous, bobbin-like cord, 

 which is intricately festooned and deposited upon stones in a spiral 

 coil. (Plate XVIII. Fig. 258.) This and many other species, 

 probably all, seem to deposit eggs both spring and autumn. Under 

 the microscope they are very curious. At first the yolk, of which 

 there are generally two or three in each egg, becomes partially di- 

 vided into two, four, eight lobes, and so on till its surface looks like 

 that of a blackberry ; then it begins to move by the vibration of little 

 fine hairs on the surface ; at length the two wing-like lobes are de- 

 veloped, and the motion becomes very rapid. The mouth and stom- 

 ach, as well as its contents, are distinctly visible. At this time it 

 inhabits a little glossy shell shaped like a Nautilus, which it carries 

 for a little time after it leaves the egg, but finally casts it off and 

 floats away to undergo a still further change, such as described 

 above. 



The centre of each branchial papilla is filled with clusters of little 

 glandular bodies considered to perform the office of the liver, among 

 which the fluids of the stomach are forced by a churning motion. 

 The papilla) are termed branchial because they are regarded as per- 

 forming the function of lungs, though this office is doubtless per- 

 formed by the action of the whole surface of the body. 



iEolis salmonacea. 



Plate XVIII. Figs. 264, 265. 



Body broad and depressed, yellowish white ; branchife subulate, salmon-cob 

 ored, in crowded equidistant ranges ; dorsal tentacles minutely serrated. 



EoNs {Carolina, Brug.) salmonacea, Couthocy, Best. Journ. Nat. Hist. ii. 68, pi. 1, 



fig. 2. 

 Cavo'hia salmonacea, De Kay, N. Y. Moll. 17, pi. 6, fig. 116 (1843). 

 EoUs salmonacea, Gould, Inv. 6. 

 ^olis salmonacea, Stimpson, Check Lists, 4 (1860). 

 Doi-is papulosa, Fabr. teste Mokch. 

 ^ulis Boclurnsis, Moll., not Grux. teste Morch. 



Body ol)long, broad, tapering backwards to an acute point, trans- 

 lucent, yellowish-white ; head large, lips tumid, mouth V-shaped ; 

 tentacles large and rather blunt, the dorsal ones minutely serrated 

 at the sides. Branchias rather long, large, and pointed, deep sal- 



