REPORT ON THE CRUSTACEA MAC III' It A. 



903 



already distinguishable, the last of which is sharp and styliform ; from the outer distal 

 extremity of the basis proceed an ecphysis that consists of two joints, the basal one 

 being very long and cylindrical, and the distal very short, cylindrical, rounded at the 

 extremity, and tipped with three or four hairs. 



The second pair of gnathopoda is somewhat larger than the first, is situated close 

 behind, and resembles it in general form but is a little more robust. 



None of the pereiopoda are yet visible even in a budding condition. 



The pleon has as yet no appendages present, and no evidence of their future develop- 

 ment is visible, except in an apparent gathering of granules in the position where the 

 sixth pair of pleopoda are formed. 



Two other specimens were captured, one (fig. 73), which is G mm. long, to the north 

 of New Guinea, in February 1875, and the other, which is 51 mm. long, in the Pacific. 



Fig. 73. — Zoea of Amphion. Dorsal surface. From 

 a drawing by Dr. von Willemoes Snhm. Reduced 

 one-half. 



Fig. 74. — "Youngest larva taken by myself, fol- 

 lowing Dohrn's larva. Nat. size 8 mm., H. } x 12. 

 Ventral aspect." From a drawing by Dr. von 

 Willemoes Suhm. Reduced one-half. 



Neither of these differs materially from that which has been described. The latter has 

 at the extremity of the peduncle of the first pair of antenna? a long ciba or hair 

 attached to the extremity of both the inner and outer angle, and others at the apex of 

 the single-jointed flagellum; and the posterior somite of the pleon exhibits the outline 

 of the branches of the sixth pair of pleopoda, on which the marginal hairs are present 

 within the outer tissue (PI. CXLVI. fig. 2z) which are a little more defined in the specimen 

 from New Guinea. These changes are probably consequent upon the internal growth 

 that precedes another moult. 



The next specimen (PL CXLVI. fig. 3) is also recorded from the Pacific ; it is 8 mm. 



