140 BRITISH OOPEPODA. 



Doropygus porcicauda was found very commonly in 

 Ascidians dredged by the Rev. A. M. Norman in 

 Birtirbuy Bay, Ireland ; also in specimens of Ascidia 

 parallelogramma dredged in a depth of twenty- seven 

 fathoms off Hawthorn on the Durham Coast. 



Genus 3. BOTAOHUS, Thorell (1859). 



Body elongated, narrow, fusiform; caudal rami 

 armed at the apex with curved spines. First pair of 

 antennae 8-jointed (9-jointed, Thorell) ; second pair 

 3-jointed, clawed at the apex. Mandible-palp 2- 

 branched, the inner branch 2-, the outer 1- jointed. 

 Maxillae composed of a basal masticatory portion and 

 a trilaminar setiferous palp; first pair of foot-jaws 

 stout, subtriangular, 5-jointed; second pair slender, 

 setiferous at the apex. First four pairs of feet with 

 both branches 3-jointed, joints of the inner branch 

 hispid at the margins; fifth pair rudimentary, 1- 

 jointed. 



1. BOTACHUS CYLINDRATUS, Thorell. PI. XXXIII, figs. 



113. 



Botachus cylindratus, Thorell. Om Krustaceer i Ascidier, p. 55, 

 tab. ix, fig. 12 (1859.) 



Female. Animal elongated, curvate (figs. 1, 2), 

 abdomen slightly more slender than the thorax; 



