130 THE VOYAGE OF H.M.S. CHALLENGER. 



like that of the swimming foot figured in the plate. From the similarity of armature, 

 existing in the second foot of some male Harpacticidse, i suppose this organ to be also 

 the second swimming foot, but as the peculiarity was not noted until after the separation 

 of limbs from body, I cannot be quite sure. 



11. Saphirina angusta, Dana. 



Saphirina angusta, Dana, Crust. U. 8. Expl. Exped. (1852), p. 1240, pi. lxxxvii. fig. 3. 

 Two specimens, apparently belonging to this species, from off Tristan da Cunha, but 

 too much distorted for description, occur on a microscopic mounting made on board. 



Saphirinella, ('la us. 



Saphirinella, Claus, Die frei lebenden Copoden, 1863. 

 Hyalophyllum, Haeckel, Beitrage zur Kenntniss der Corycseiden, 1864. 



Body oval, extremely flattened, quite transparent, colourless or slightly opalescent. 

 Body-segments like those of the male Saphirina, but with a very rudimentary fifth seg- 

 ment aud feet. Inner branch of the fourth pair of feet one-jointed ; fifth pair simple and 

 bearing two setse. Mouth-organs distant and rudimentary, except the posterior foot-jaws, 

 which are armed with strong prehensile claws. Eyes having a eommon pigment mass 

 with latei-al and median lenses, sometimes a small unpaired eye-spot connected with the 

 pigment body. No corneal lenses (conspicilla) ; caudal stylets very long and s ender, 

 linear. 



Of this genus very few specimens came under my notice, and these were generally 

 more or less damaged, so that I have not had the opportunity of dissecting the animal 

 very minutely. On this account I have preferred to borrow the generic definition given 

 above from the work of Dr. Claus on the Copepod-fauna of Nice, a memoir in which the 

 characters of this genus and its relation to Haeckel's Hyalophyllum are discussed at con- 

 siderable length. Dr. Claus concludes that the two genera are identical, and in this 

 conclusion I entirely agree. The specimens observed in the Challenger gatherings appear 

 all to belong to the same species, Saphirina stylifera, Lubbock ; but another species 

 very closely resembling it is admitted by Haeckel and Claus, — Saphirina vitrea (Hyalo- 

 phyllum vitreum, Haeckel). 



Saphirindla stylifera (Lubbock), (PI. XLVII. figs. 13-16, and PL XL VIII. figs. 9-13). 



Saphirina stylifera, Lubbock, Traus. Entom. Soc, vol. iv. (1856), p. 28, pL iv. figs. 9, 10. 

 Saphirinella mediterranea, Claus, Die frei lebenden Copepoden (1863), p. 154, pi. xxv. fig. 12. 

 ,, stylifera, Claus, Die Copepoden-fauna von Nizza (1866), p. 17, pi. i. figs. 13, 14. 



Hyalophyllum pellucidum, Haeckel, Beitrage zur Kenntniss der Corycseiden (1864), p. 63, pi. i. 

 figs. 1-6, and pi. iii. tigs. 31-39. 



Male. — Length, 22-100ths of an inch (5'5 mm.). Outline of the body broadly ovate. 



