LIOHOMOLGUS. 51 



uncinate terminal claws in place of the usual brush of 

 setae. Mandible (PL LXXXV, fig. 12) densely clothed 

 at the base with long marginal setas, those of the outer 

 side the longest, and densely plumose ; maxilla digiti- 

 form, bisetose. Spines of the anterior foot-jaws long 

 and slender (PL LXXXVI, fig. 16), each bearing a 

 series of long setse on the external margin near the 

 base; last joint of the second foot-jaw, in the/emaZe, 

 short and broad (fig. 17), bearing a single short uncinate 

 claw; in the male (PL LXXXV, fig. 13) subovate, 

 and ending in one short and one very long falcate 

 claw. Inner branch of the fourth swimming-foot 

 (fig. 14) 2- jointed, first joint short and bearing a 

 single seta, second nearly twice as long, somewhat 

 pear-shaped, with a broad truncate apex, from which 

 spring two spine-like setse ; fifth foot consisting of a 

 single joint with two terminal setae. First abdominal 

 somite of the male (fig. 16) much swollen, rounded 

 below, the other segments all very short; caudal 

 appendages slender, jointed in the middle, as long as 

 the last five abdominal segments, terminal setae rudi- 

 mentary ; in the female (PL LXXXVI, fig. 18) the 

 second and fifth abdominal somites are much elongated, 

 and the first is scarcely at all tumid. 



In the " Last Report of Dredging among the Shet- 

 land Isles," Mr. Norman records this species as having 

 been found in the " water passages and branchial sac 

 of Ascidia mentula." It occurs also in a collection of 

 Copepoda found by Mr. Norman in Ascidians dredged 

 at Oban and kindly sent to me by him for examina- 

 tion ; and I have myself found it amongst specimens 



