666 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 47. 



Naturalist (July, 1872, page 411), an account of the species followed 

 by a diagnosis and accompanied by three text figures. The generic 

 characters just given have been taken largely from his diagnosis, 

 and, of com-se, apply equally well to the species. Neither his descrip- 

 tion nor his figures give us any details of the appendages, and since 

 the original specimens have been lost we are left with the above 

 meager details. They appear sufficient, however, to guarantee the 

 validity of the genus, and so it is retained wdth the hope that some- 

 time other specimens may be obtained and the genus be more finnly 

 established. 



Genus CLAVELLA Oken. 



Clavella Oken, 1815. 



Schisturus (part) Oken, 1815. 



Lemaeomyzon Blainville, 1822. 



Clavella Cuvier, 1830. 



Anchorella Nordmann, 1832. — Kr0yer, 1837. Not Anchorella Cuvier, 1830. 



Generic cTiaracters of female. — Cephalothorax distinctly separated 

 from the trunk, long, wormlike, and standing at an angle with the 

 body axis, often in line with the second maxillae; trunk pear-shaped 

 or ovoid, wdthout posterior processes, abdomen, or anal laminae; an 

 impaned genital process often present, ventral to the anus and con- 

 necting v\dth the semen receptacle. 



First antennae three-jouited, arising from the ventral surface of 

 the head between the second antennae and the proboscis; second 

 antennae miiramose, turned inward toward each other across the 

 frontal margin of the head, often meeting or even overlapping on the 

 midline; first maxillae bipartite, with a palp; second maxillae entirely 

 fused, usually very short, sometimes altogether lacking; maxiUipeds 

 stout, the terminal claw usually with an accessory claw on its inner 

 margin. 



Generic cJiaracters of male. — Cephalothorax and tinmk folded to- 

 gether ventrally and fused into an unsegmented ovoid, in which there 

 is no distinction of parts; no dorsal carapace or anal laminae; first 

 antennae two-jointed; second antennae uniramose and three- jointed; 

 first maxillae bipartite, without a palp; second maxillae and max- 

 iUipeds close to the mouth-tube and strongly uncuiate; all the ap- 

 pendages pointing diagonally downward and forward. 



Type. — ClaveUa uncinata (MiiUer). 



{ClaveUa, the diminutive of clava, a club.) 



Remarks. — In his Lehrbuch der Naturgeschichte (1815) Oken first 

 proposed (p. 182) three genera for the Lernaeans, PJiyllina, Scliis- 

 turus, and Lemaea. Under the second name he included 15 species 

 which had been previously included in the genus Lernaea; among these 



