238 CEYLON PEARL OYSTER REPORT. 



CJropods shortening progressively in extent, so that the 1st project the furthest; 

 the inner ramus of the 1st is aboul half as large as the outer ; the rami of the 2nd 

 and Mrit pairs are subequal in length ami breadth, and arc all ciliate on the inner 

 margins. 



The telson is semi-oval, covering two-thirds of the rami of the 3rd uropods. 



The only known species of the genus, and easily recognizable by the powerful 3rd 

 and 4th perseopods. 



Hyale, Bath ke, 1837. 



Hyale nilssoni (Rathke), var. 



Station XLVIL, 1 male; Station LVIIL, 9 specimens. 



This is the same form as that taken by Dr. II. (). Forbes on shore on the island of 

 Abd-el-Kuri ('Nat. Hist, of Sokotra and Abd-el-Kuri,' 1903, p. 219). As there 

 stated, it differs from the type in the length of antenna? (in the specimen from 

 Station XL "VII. not even in that) ; in the more rounded lobe of the wrist in the 1st 

 gnathopod of the male and the 1st and 2nd gnathopods of the female ; and in the 1st 

 ioints of the last 3 pairs of perseopods, which are serrate instead of smooth. I do not 

 consider these differences sufficient to constitute a new species, but, if anyone wishes 

 to do so, I suggest the name " kuriensis." They seem to me, however, quite as 

 important as those that characterize some other species, such as //. stebbingi, 

 Chevreux, and II. grimaldii, Chev. ('Result, des ('amp. Sci. de " l'Hirondelle," : 

 pp. 8-10), but the genus appears to have been rather overworked. 



Ichnopus, A. Costa, 1853. 

 Ichnopus taurus, Costa. Plate I., fig. 3. 



One male, Station XLI., about 100 fathoms. 



The only point in which this species seems to differ from Della Valle's descrip- 

 tion, &c. (' Gamm. d. Golfo di Napoli,' p. 802, Plate 27), is in the comparative square- 

 ness of the 1st joint and the greater width of the 3r*d and 4th joints of the 3rd 

 perseopods in our specimen (fig. 3. pp. 3 ). I agree with Della Valle that /. spini- 

 cornis, Boeck, and /. affinis, Heller, can hardly be considered distinct species. 



Socarnes, Boeck, 1870. 



Socarnes schmardaa (Heller). 



Anonyx schinardse. Heller, 'Amph. des Adriatischen Meeres.' 

 Ichnopus schmarda, Heller, Della Valle, he. tit. 



One male, Station VI. 



Lateral angle of the head moderately produced, acute. Eyes occupying almost the 

 whole head. Posterior margin of the 3rd pleon segment slightly convex, lower margin 

 straight, angle rounded. The 1st urns segment is dorsally depressed. 



