372 ARTHUR DENDY. 



These small spines are prominent upon the papillas^ each of 

 which may bear in addition a single spine at its apex. 



On the spinous pads of the feet the spines are long and 

 slender^ and covered near the base with numerous minute 

 secondary spines. 



Along the mid-dorsal line there runs a very narrow longi- 

 tudinal groove (figs. 5, 6, D. F.), from the floor of which 

 pigment is absent, giving rise to a narrow white line which 

 may be concealed by overarching of the lips of the groove in 

 contracted specimens. 



The predominant colour of the pigmented epidermic cells, 

 when seen by transmitted light, is a beautiful indigo-blue, 

 which may be replaced by green, tawny orange, brown, or 

 nearly black, giving rise to a variety of patterns, which will 

 be described when dealing with the specific characters. 



The eyes appear externally as a pair of small, pearl-like, 

 hemispherical protuberances in the usual situation, one just 

 behind and on the outer side of the base of each antenna. In 

 one specimen of 0. oviparus the eyes appeared of a bright 

 red colour. 



c. Internal Anatom}'. 



General. — The internal anatomy of Ooperipatus (as 

 exemplified by 0. oviparus and 0. viridimaculatus) 

 agrees so closely in most respects with the well-known 

 Peripatus type, that it seems almost superfluous to do more 

 than refer to the general dissections shown in figs. 4 and 27. 



The slime-glands are enormously developed, so that when 

 uni-avelled they are much longer than the entire animal. 

 When the animal is starved for some time, the tubular slime- 

 reservoir becomes greatly distended by the accumulation of 

 the secretion, which the animal has been unable to make use 

 of in capturing its prey (fig. 27). I have elsewhere (4) 

 pointed out that in 0. in sign is the secretion of the slime- 

 glands contains very numerous corpuscles, but as the liquid 

 rapidly hardens into an enamel-like mass on exposure to the 



