672 Beady and Norman — Monograph of the Marine and Freshtvater Ostraeoda 



horizontally. Beginning from behind, the upper margin of this plate throws out 

 a vertical process divided into four teeth at the extremity ; this is followed, after an 

 interval, by another similar process divided into three teeth ; after another 

 interval another process with two teeth ; and then the extremity rises into 

 a great fang five or six times the length of the dentated processes which 

 precede it. Below this tooth lies a second, in which on the further portion of the 

 plate or jaw are some teeth which we cannot clearly see; but near the anterior 

 extremity is a fang-shaped process, which has on its inner margin three denticula 

 tions ; this is followed by the terminal fang, which is much smaller than that of 

 the first jaw (not quite half its length), and instead of being a simple fang, as in 

 that case, bears 3—6 denticulations in front and three nodulous processes on 

 the side at the back. On the side of the first described jaw are two setfe placed 

 close together. Beyond the jaws is the usual palp, which here is represented by a 

 single lobe, with one lateral and four terminal setse. Just behind the base of the 

 palp are two small-ringed setae ; beyond these again comes the vibratory lamina, 

 which has a somewhat flexuous outline, and is firinged with about forty-three 

 plumose setae. The penultimate appendages (fig. 9) consist of three lobes, the inner 

 with one lateral and four apical setae, the second with four apical setae, the outermost 

 with three apical setae, and five large plumose setae on its outer margin ; the 

 character of these setae seem to suggest that they represent the coalesced vibratory 

 lamina, which as a lamina is wholly absent. 



The vermiform limb has six terminal and one pair of lateral, long, slender 

 spines,* with 3—5 pairs of spinules near the extremity ; the tips of the end of the 

 appendage itself are furnished with a few (we count four) simple, curved, spine-like 

 processes. The caudal laminae (fig. 10) are about twice as long as their breadth 

 at the base ; the ungues are ten, and being well sej)arated at their origin occupy the 

 greater part of the hinder margin ; the third from the end is smaller than the 

 fourth and second. The larger ungues are ciliated on the edge ; the last is about 

 the same size as the penultimate. 



A single specimen was dredged by the " Talisman" o£E the coast of Morocco, 

 July 6, 1883, in 1435 metres (Marquis de Folin). 



The single specimen which we have seen had been preserved dry. After 

 drawing the shell it was macerated, and the animal being thus restored, has been 

 dissected, figured, and described. 



* These curious processes we have in this work called spines, but they are not so here, and very often 

 they are closely annulated in structure. 



