EEPOET ON THE ISOPODA. 



53 



Station 149b, January 17, 1874; lat. 49° 28' S., long. 70° 30' \V. ; 25 fathoms; 

 bottom, volcanic mud. 



Station 149d, January 20, 1874; lat. 49° 28' S., long. 70° 13' W.; 28 fathoms; 

 bottom, volcanic mud. 



Station 149E, January 21. 1874; lat. 49° 37' S., long. 70° 16' W. ; 30 fathoms; 

 bottom, volcanic mud. 



Station 149k, January 29, 1874; lat. 48° 40' S., long. 69° 6' W.; 45 fathoms; 

 Ijottom, volcanic mud. 



7. Serolis hromleyana, Suhm (PL IV.). 



Sc.rolis hromleyana, v. Willemoes Suhm, Proo. Eoy. Soc. Lond., vol. xxiv. p. 591, 1876. 

 Herolis hromleyana, Challenger Briefe, No. II., Zeitsohr. f. ■\viss. Zool., Ed. xxiv. p. xix., 1874. 



This species, which is cousideraltly the largest of the genus, has been already Ijriefiy 

 characterised by tlie late Dr. v. Willemoes Suhm from two specimens dredged in 1975 

 fathoms near the Antarctic ^ce-Barrier. The following description is taken from these 

 sjjecimens : — Length of male 54 mm., greatest breadth (at the level of the third epimera) 

 56 mm.; length of female 45 mm., greatest breadth 39 mm. 



The male difters from the female l)y its greater size and in the greater length of the 

 epimera ; in both sexes the length of the thoracic epimera gradually increases up to the 

 sixth, which are by far the longest, and extend for a considerable distance behind the termi- 

 nation of the caudal shield. The extreme length of these epimera, measured fi'om their 

 articulation with the epimera of the preceding segment, is 47 mm. in the male and 

 33 mm. in the female. The epimera of the second and third abdominal segments project 

 beyond the caudal shield in the male ; in the female the last pair barely reach as far as 

 its termination. The form of the sterna of the free abdominal segments does not diflfer 

 at all in the two sexes. 



The outline of the body is more or less oval, and the great length of the epimera, 

 which become extremely narrow and spiniform towards their end, serves to distinguish 

 this species from all others, with the exception of Serolis vecera and Serolis gracilis. 

 From both these species, however, it can readily be separated by numerous other points 

 of difference. The body is covered with scattered hairs, which are especially developed 

 upon the sides of, the epimera. The colour (in alcohol) is violet-grey with whitish yellow 

 patches upon the caudal shield and posterior portion (if the thorax ; the colour of the 

 living animal is described by v. Willemoes Suhm as being of " a fine lilue colour with a 

 red spot extending over the midst of the body and the eyes." 



Cephalic Shield. — The shape of the cephalic shield can be understood by a reference 

 to PI. IV. fig. 1 ; it is longer than broad, owing to the projection of its lateral portions 

 for some way in front of the rostrum ; these antero-lateral portions of the cephalic .shield 



