REPORT ON THE CRUSTACEA MACRURA. 



905 



Another specimen (PL CXLVI. fig. 4) was taken north of New Guinea. It is about 

 the same size as the last, 8 mm., but differs from it in having the first pair of pereiopoda 

 with a long and sharp tooth on the middle of the basisal joint, and in having the fourth 

 pair of appendages — the second pair of pereiopoda — present in an incipient con- 

 dition. 



This new pair is not, like the preceding one, a free appendage, but is enclosed within 

 the dermal tissue each in the form of a long, narrow, and slightly constricted .sac, com- 

 pressed against the ventral surface of the pereion and directed forwards between the pre- 

 ceding pairs. 



Fig. 75. — " From the north coast of New Guinea, Feby. 1875. Five-legged larva stage. Maxillipeds omitted ; h, k, liver 

 first visible ; ventral aspect. Nat. size 12 mm. H. J." From a drawing by Dr. von Willemoes Suhm. Reduced 

 one-half. 



Another specimen (PL CXLVI. fig. 5), which was taken at the surface in the 

 Atlantic, off St. Vincent, Cape Verde Islands, on April 6, 1873, is 9 mm. long, and 

 corresponds very closely with that of fig. 4, but the second pair of pereiopoda exists 

 as a free pendulous organ, although in a saccular condition, in the form of a stalk with 

 two branches, which lie inwards and are directed forwards. 



In this Atlantic specimen the small rostral point at the anterior extremity of the 

 carapace, that is common to all the Pacific specimens, is wanting ; it probably therefore 

 is the young of Am/phion provocatoris. 



It may be noticed that this specimen also differs in having no tooth on the outer 



(ZOOL. CHALL. EXP. PART LII. — 1888.) Fff 114 



