266 



ON ANNELIDS FEOM THE MEltGTJI AECHIPELAGO. 



the outer cuticle may not be a secondary fusion, analogous, there- 

 fore, to the fusion of cuticle and vitreous body in Elater, Lam- 

 pyris, &c. described by Grenadier*. The condition of the eye 

 in certain Alciopidae, for example in Ncmphanta celoxf, where the 

 hypodermis and vitreous layer intervening between the cuticle 

 and lens has become extremely rudimentary, suggests that this 

 is the case. On the other hand, the resemblance to what Profs. 

 Lankester and Bourne J would term (if it were an Arthropod eye) 

 a monomeniscous diplostichous non-retinulate eye is not a little 

 striking. 



DESCRIPTION OF PLATE XXI. 



Fig. 1. Eapompe indica, n. sp. Anterior segments, e, eye; e', eye-spots. 



2. Dorsal seta of Chloeia merguicnsis. n. sp. 



3. Side view of head of Eupompe indica, n. sp. ; e, eye. 



4. 5. Branchiomma intermedium, n. sp. 



6. Tentacle of ditto, viewed laterally. 



7. Transverse section of ditto. 



8. Eye of Chloeia mcrguiensis, n. sp. r, retina ; n, rods ; e, hypodermis ; 



I, vitreous body (?). 



9. Base of retinal rods, viewed in transverse section. 



* Grenadier, ' Untersuchungen iiber das Sehorgan der Arthropoden.' 

 t Greefif, loc. cit. p. 69, pi. v. fig. 43. 

 % Q. J. M. S. vol. xxiii. (1883), p. 210. 



