ISOPOU GENUS L1C4IA. 699 



Biidde-Luiid (1885), without having seen a specimen, regarded 

 this species as a synonym of X. exotica. The features which dis- 

 tinguish it from L. exotica were fully pointed out by Richardson 

 (1902), with additional evidence for its separation from that 

 species. Chilton (1916), who had not seen a specimen, i-emarks 

 that it " may be difficult to find characters that will distinguish 

 between them in all cases." 



Among Budde-Lund's material, I found a tube bearing a name 

 of an undeseribed species of Ligia which he evidently intended 

 to describe in tlie course of his revision of ' Isopoda Terrestria.' 

 An examination of the specimens showed at once that they were 

 identical with Milne-Edwards's haudiniana, which had obviously 

 been overlooked by Budde-Lund. This furnishes a further proof 

 of the complete independence of this species from the exotica^ as 

 upheld by Richardson. 



Figures in Richardson (1905). 



13. Ligia pigmentata, sp. n. (PI. I. figs. 2 & 3.) 



The material consisted of a single female specimen and a few 

 appendages which may have belonged to a male. 



Length 14 mm. Breadth 5 mm. 



Surface slightly granulated, nearly smooth. Colour cream, 

 with scattered minute black spots. Eyes large, quadrangular and 

 separated by their horizontal length. Antennce of moderate 

 length ; flagellum reaching as far back as half-way across 5th 

 thoracic somite, peduncle half-way across 2nd somite, Flagellum 

 with 18 short and broad segments. C'o^a^ jo/afcs with suture lines 

 exceedingly lightly marked on 2nd, 3rd, and 4th thoracic somites 

 only. They are produced but little backwards on any somite. 

 Abdomen not abruptly conti^acted. Telson triangulate ; median 

 process bluntly pointed ; postero-lateral processes acute but short ; 

 inner accessory processes small and blunt. Mouth-parts : 2nd 

 maxilla strongly bilobed ; without hairy bristles on inner edge. 

 Maxillipede palp with joints completely separated. Perceopods 

 typical in form. A separate one (male?) had a thick bunch of 

 setae on the dactyl, over the unguis. Uropods 6 mm. Base 2'5 mm., 

 rami 3'5 mm. 



Distribution. Suez. 



Budde-Lund had labelled the tube containing this specimen 

 Avitli the above specific name, but had apparently published no 

 description or figures of it. . 



14. Ligia perkinsi (Dollfus). (PI. I. fig, 1.) 



Geoligia perkinsi Dollfus (1900), p. 525. 



Male specimen described. 

 Length 18 mm. Breadth 8 mm. 



Siorface almost smooth. Eyes large and separated by their 

 horizontallength or a little less. Antennce very long and slender ; 



