260 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



Types. — Female holotype, USNM 109553, and 12 paratypes (2 

 males, 3 females, 7 juveniles), USNM 109554, from Bahia Fosfores- 

 cente, Puerto Rico, Feb. 4, 1957. 



Distribution. — This species is rather imcommon in the bays. 

 T. compernis is the 3rd species of Tortanus to be reported from the 

 western North Atlantic and the 1st from the West Indies. T. dis- 

 caudatus (Thompson and Scott) is a northern species whose southern 

 record is at the mouth of Delaware Bay (Deevey, 1960). T. setacau- 

 datus Williams ranges south from Woods Hole (Wilson, 1932b), around 

 Florida, and into coastal waters of the Gulf of Mexico. Grice (1960a) 

 reports it from the west coast of Florida, and there are specimens in 

 the U.S. National Museum from Biscayne Bay, Fla., and the 

 Laguna Madre of Texas. Foster's (1904) Tortanus sp. from Louisiana 

 is probably T. setacaudatus, as is the inadequately described Calanus 

 americanus Herri ck (1887) from Mobile Bay, Ala. 



Remarks. — The specific epithet compernis (from the Latin "com- 

 pernis," meaning "knock-kneed") refers to the characteristic shape of 

 the caudal rami. 



Order Harpacticoida 



Family Longipediidae 



Body elongate. Head fused with PedSeg 1 ; rostrum large, lingui- 

 form. Epimera of PedSegs 2-4 well developed; posterior corners 

 angularly produced. Urosome narrowing posteriorly. Genital seg- 

 ment of female with transverse dorsal groove ending laterally in spine 

 on either side. Anal operculum w'ith terminal central spine and usu- 

 ally smaller ones on either side. Caudal rami short. Al 5-segmented. 

 Re of A2 6-segmented. Ri of Md 2-segmented, Re 1 -segmented. 

 Re and Ri of P1-P4 3-segmented. Re3 of P2 very long. Distal 

 segment of P5 more or less elongate, with 5 setae in female, 6-8 in 

 male. Nauplius with long median caudal spine. Contains one 

 genus, Longipedia. 



Longipedia Glaus, 1863 



Although Longipedia is not a holoplanktonic genus, it appears to 

 leave the bottom and swim freely more frequently than most other 

 harpacticoids. Since we have collected it occasionally with plankton 

 nets towed in Bahia Fosforescente, we are including it in this paper, 



L. coronata Claus (1863), the type species by monotypy, cannot be 

 assigned with confidence to any of the species currently recognized, 

 and it has become customary to give the name L. coronata to the 

 species fully described under this name by Sars (1903). Eventually 

 a neotype of L. coronata Claus sensu Sars should be selected to legalize 

 this practice and prevent confusion. 



