Gattij Marine Laloratori/ , St. Andreioa. l;"* 



directed downward and backward, or just in front of the 

 tail downward and forward. In these elongated bristles 

 the wings are indistinguishaljle. A few shorter bristles, 

 l)roi)ably in process of develoj)nient, occur in these tufts. 



The striated shafts of the long anterior hooks are even 

 more tapered at the insertion tlian in C.fauveli, and they 

 increase in diameter upward to the shoulder, whicli gently 

 diminishes to tlie stout neck. The great fang leaves tlie 

 throat nearly at a right angle, and on the crown above it in. 

 lateral view are five or siv teeth. The neck and shoulder of 

 tiiese hooks have a forward curve, so that the head is carried 

 l)aekward. The posterior liooks have a convex anterior and 

 a concave posterior outline, but the base is not bent back- 

 ward as in the ordinary aviculariaTi forms. The main fang 

 leaves the throat at somewhat less than a right angle, and 

 is strong and sharp. Above it is a series of four or five or 

 more small but distinct teeth. The slightly-curved neck 

 dilates a little as it merges into the stunted shaft or base, 

 which has a slight flexure backward, the character of the 

 hook being thus diagnostic, and so different from those of 

 species of Clione hitherto described. In a variety from 

 Fiumark the bases of these hooks are tapered into shaft-like 

 processes, and the whole series constitute in each foot an 

 elegant fan. They form a single row. 



Chone filicaudata, Southern, from Clew Bay, Ireland, is 

 the seventeenth species, and differs from Chone duneri, 

 Malmgren, which it approaches in the presence of a bifid 

 process of the lip-membrane, in tlie form of the posterior 

 hooks, which have a higher crown and more numerous teeth 

 above the great fang in lateral view. It also has a conical 

 anal appendage. The terminal process of the branchial 

 filament has a central axis and a web on each side. It is the 

 rule, however, for the posterior hooks in most species of this 

 genus to have higher crowns. The occurrence of a caudal 

 filament on Chone duneri in certain cases, however, makes 

 the distinction less evident, yet the posterior hooks diverge. 



Jasmineira elef/ans, De St. Joseph, a southern form, is the 

 eighteenth species. The cephalic lobe, when the branchiae 

 are removed, presents a mushroom-shaj)ed basal region — 

 that is, it is constricted proximally and dilated distally, and 

 has a median cleft. It is marked externally by longitudinal 

 lines or grooves. From the ventral edge of each half three 

 or four slender smooth tentacles (four to six. De St. Jo.^eph) 



