A ni phi pod Ovchest'ia. fucuranna, Fritz Midler. 377 



reseml)lance ot" the secotul giiatliopod to that of my Picton 

 specimens. A comparison of my specimens with Stobbing's 

 description and fif^ures of 0. sulensoni made it appear very 

 probable that they belonged to the same s|)ecie.s, though the 

 palm of the second gnathopod of O. sulensoni is shown con- 

 siderably more oblique and tliat ajiecies was supposed to have 

 been obtained at Madeira, the locality, however, being 

 doubtful. 



Stebbing states tliat his species agrees with the imperfectly 

 described 0. tuciiranna, Fritz Miiller, in regard to the finger 

 and the notched pahn of the second giiathopods, but appears 

 to differ in not having the fourth and fifth joints of the fifth 

 peraeopod thickened or broadened. In turning up Fritz 

 Miiller's reference to his specimen in 'Facts and Arguments 

 for Darwin/ 1869, p. 79, I find that the second gnathopod 

 of the male, as figured by Fritz Miiller, agrees pretty closely 

 with that of the Picton specimens, and that, moreover, the 

 description given by Fritz Miiller of the changes that take 

 place in the males even after they attain sexual maturity and 

 his account of the more immature males agree very well 

 indeed with those exhibited by the Picton specimetis. Thus 

 I had already noted that in them the first few joints of the 

 flagellum of the second antenna were more or less completely 

 fused in the fully developed males and that in the young 

 males the process on the finger atid the corresponding notch 

 on the palm of the second gnathopod were only slightly 

 developed. There seems little doubt that the specimen 

 described by tStebbing as 0. sulensoni is really the same as 

 Miiller's 0. tucuraima. Stebbing's description of the various 

 characters not mentioned by Fritz Muller agrees closely with 

 the Picton specimens ; thus, while the basal joint is oval in 

 the third and fourth peraiopods and partially so in the fifth, 

 its hind margin in that limb is almost quite straight as 

 described by tStebbing. In my specimens, in the better 

 developed males the second antennae are strong and have the 

 last two joints of the peduncle considerably broadened, but in 

 none of my specimens have I seen the fourth and fiftn joinis 

 of the fifth per^eopod specially broadened; they are eomp.irii- 

 tively slender, as drawn and described by Stebbing. 1 have 

 little doubt, however, that Fiitz Miiller is liglit in saving 

 that this character is shown only in the older males and is 

 not fully developed until after they come to sexual maturity. 

 I have often noticed the same thing in the nearly allied 

 species 0. chUiensis, AJ.-Edw., where the males may have the 

 cliaracteri.stic form of the second gnatliopod ajid of tlie an- 

 tenna?, though they have not yet developed the thickened 



