from the Australian and China Seas. 475 



mens obtained by Mr. Bassett-Smith, it has not seemed to 

 me advisable at present to adopt Dr. de Man's opinion. 



Tn one semi-larval form (10 niillim. in length) from Baleine 

 Bank the groove is represented only upon the fifth abdominal 

 tergite. 



(7) Gonodactylus Smi'thii, sp. n. (PI. XX. B. fig. 1.) 

 (?Var. of G. chiragra.) 



Colour a deep green, obscurely mottled, the manus of the 

 raptorial limb reddish purple, the distal extremity of the 

 penultimate segment indigo-blue ; a reddish-purple spot on 

 the inner side of the distal extremity of the large segment of 

 the appendage. 



This species is closely allied to G. chiragra^ from which it 

 appears to differ in being more robust and in the ornamen- 

 tation of the telson and of the sixth abdominal tergite. The 

 crests upon these two plates are the same in number as in 

 chiragra, but are much more compressed and carinate. Thus 

 on the sixth abdominal tergite theci-ests are ridges, flat above 

 and produced without constriction into long spines, which 

 considerably overlap the hinder border of the tergite ; in 

 chiragra these crests are wider, convex above and rounded 

 behind, the spines being very short and sharply defined from 

 the rest of the crest. In the telson, again, the median promi- 

 nence is a strongly compressed ridge, the upper edge of which 

 is almost straight and the posterior angle is regularly pro- 

 duced into a long strong spine ; all the other crests are 

 similarly compressed and carinate ; in chiragra the median 

 crest is convex above, sometimes tipped with a small spine, 

 rounded behind and scarcely compressed. 



The following measurements (in millimetres) will show the 

 stouter build of this new form : — Total length (from base of 

 rostrum to notch of telson) 23'5 ; width of fifth and first 

 abdominal somites and of carapace 4*5, of second free thoracic 

 somite 4'3 ; length of carapace 6"3, of eye 2"8. 



An example of chiragra measuring 23 millim. in length 

 has the fifth abdominal somite and the carapace only 3'8 

 millim. wide, the latter plate being b'Q millim. long and the 

 eye-stalk 2"5. Again, an example of chiragra with the 

 abdomen 4"5 millim. wide measures 27 millim, long, the 

 carapace being 7 millim. long and the eye-stalk 2'8. A 

 second example of Smithii measuring only 17 millim. long 

 shows corresponding differences when compared with an 

 example of chiragra of the same length. These con)parisons 

 show that, in addition to being stouter in body, the eyes are 

 longer in tSmithii. 



