ABT. 5. NORTH AMERICAN PARASITIC COPEPODS WILSON, 73 



tubercles without rami; fourth pair with minute, one-pointed rami. 

 Male unknown. 



Type of the genus. — Bassettithia congri (Stebbing), monotypic. 



Remarks. — This genus was established in the year 1900 by Kev. 

 T. E. E. Stebbing and was named in honor of Dr. P. W. Bassett- 

 Smith, E. N. The name given by Stebbing. however, had been pre- 

 occupied by Ashmead in 1887 for a genus of insects, and in its place 

 is suggested the altered form given above, which includes a portion 

 of the Smith as well as all of the Bassett. 



Genus PSEUDOCLAVELLA Baasett-Smith. 



Pseudoclavella Bassett-Smith, Anu. Mag. Nat. Hist., ser. 7, vol. 2, 189S, 

 p. 92. 



External genet^ characters of female. — Head fused with first 

 thorax segment, the two globose and covered with a dorsal carapace, 

 which is cleft at the center of the posterior margin. Second thorax 

 segment free, narrower than the head; the remaining thorax seg- 

 ments fused with the genital segment into an elongated, spindle- 

 shaped body, considerably narrowed posteriorly, and four times as 

 long as the cephalothorax. Abdomen minute and one-jointed; anal 

 laminae lamellar. 



First antennae indistinctly three-jointed, setose; second pair two- 

 jointed, the terminal joint a stout, strongly curved claw. First 

 maxiliae minute, slender, and straight ; second pair three-jointed, 

 the terminal joint a curved claw. Maxilliped long and slender, the 

 basal joint projecting beyond the margin of the head, the second 

 joint long and filiform, the terminal claw short and curved. First 

 two pairs of legs biramose, rami two- jointed except the endopod of 

 the first pair, which has but a single joint. Third and fourth legs 

 uniramose, one-jointed, tipped with setse. Egg tubes as long as the 

 entire body, eggs large and well flattened. 



Type of the genus. — Pseudoclavella ovalis Bassett-Smith, mono- 

 typic. 



Remarks. — The name chosen for this genus is unfortunate for the 

 following reasons: Oken^^ first proposed the genus Clavella^ with 

 the type species uncinata, and both stand to-day as he established 

 them, but they are Lernaeopods and not Dichelesthiids. Kr0yer^^ 

 made Oken's Clavella a synonym of Cuvier's Anchorella, and then 

 on page 195 he restored the genus Clavella, but took as its type the 

 species hippoglos which is a Dichelesthiid. Milne Edwards and 

 subsequent writers followed Ivr0yer's mix-up and Clavella was re- 

 garded as a Dichelesthiid genus until Poche in 1902 showed that if 

 Clavella is to be retained at all it must be as a Lernaeopod genus. 



** Lehibuch der Naturge.scbichte, 181.5, p. 357. 

 a=> Naturhistorisk Tidsskrift, vol. 1, 1837, p. 193. 



