NEMATOIDEA. 



4i: 



Clavella, Oken, 

 We find none of those appendages, the animal merely fastening 

 itself by the mouth *. 



In these three last groupes the hooks of the mouth are well marked ; 

 their strings are but slightly elongated, and sometimes the posterior 

 portion of the body is provided with other appendages. 



In consequence of a recent examination, I place here the 



Chondracanthus, Laroch., 

 Where the mouth is also furnished with hooks, and tlie sides of the 

 body with appendages, so extremely various as to form and number, 

 that in process of time we shall have to subdivide them. 



Thus, in some, we observe on each side two sorts of arms more or 

 less elongated f. 



In others there are several pairs partly forked J, or even more 

 ramous §. 



Some again have a slender neck, and a wide body slashed on the 

 edges !|. , 



At the end of this order I also place an animal which approaches it in 

 several respects, but Avhich may one day serve as the type of a new 

 one. It forms a. genus which I have named 



Nemertes, Cuv. 

 It is an extremely soft and elongated worm, smooth, slender, flattened 

 and terminated at one extremity by a blunt point, pierced by a hole ; 

 the other end, by which it fastens to its prey, is widened and very open. 

 Its intestine traverses the Avhole length of the body. A second canal, 

 probably connected with the process of generation, serpentines along 

 its parietes and terminates in a tubercle on the margin of the Avide 

 opening. Messrs d'Orbigny and de Blainville, who saw the animal 

 while alive, assure us that the wide aperture is its mouth. 



N. Borlassi, Cuv. ; Borl., Cornw., XXVI, 12, is more than 



Act. Suec, 1751, and Encyc. Method., Vers, pi. LXXVIII, f. 13, 18 ;— X. Pernef- 

 iiaim, Blainv. ; Pernetti, Voy. aux Malouines, I, pi. i, f. 5, 6 — two badly figured 

 species. The L. huchonis, Schrank., Trav. in Bav. pi. I, f. A, D, is sti 1 worse. 

 There are several others. 



I think that this and the precet:'*g group will re-enter the Lerneomyz-E, Blainv.; 

 which in that case must be differently defined. 



* Levnaa vncinafa, Miill., Zool. Dan., I, xxxiii, 2; — L. clavafa, Id., lb., i. These 

 Clavell.e of Okeu form the Lerx^a proper of M. de Blainville. 



t Lern.-pa radiuta, Miill., Zool. Dan., XXXIII, 4 ;— i. (johina, Id., lb., 3. The 

 first is the type of tlie genus Anones, Oken. 



X Lerncea cornuta, Id., lb., 6, and several new species. 



§ Chondracanlhus zei, Laroche, Bullet, des Sc., May 181 1, pi. 2, f. 2. 



II Lenica triglce, Blainv., Diet, des Sc. Nat., sxvi, p. 325 ; Cuv. R^gn. Anim., 



pi. XV. 



N. B. M. de Blainville arranges my ChonJracauthl iu his genera Lerneentome, 

 Lernacanthe and Lernanthrope. 



N. B. The Lerncea pectoraUs, Miill., Zool. Dan. XXXIII, f. 1, is a Calygus, and 

 the L. asellitij, It. West. Goth., Ill, 4, also seems to be one of the same, but dis- 

 figured, 



E E*2 



