HARDWICKE'S SCIENCE-GOSSIP. 



253 



Fig. 96. 



Fig. 97- 



Fig. 98. 



At 10.15 first tendency to assume 

 a cup-form at sides, a truncated 

 cone appearing in the centre. 



Great agitation and swaying of the 

 protoplasm. 



At 10.18 an edge of thin pro- 

 toplasm is becoming more and 

 more apparent. Will this develop 

 cilia ? 



At 10.20 separation more com- 

 plete. The vesicles are longer and 

 thinner. 



Fig. 99. 



Large tentacles (? hydrazoid processes) tend to 

 appear at the sides. 



At 10.22 cilia now developed 

 from the belt spoken of above. 



Fig. 100. 



They move very slowly, and are evidently not yet 

 perfect in functional activity. 



At 10.25 tne undulatory motion continues. On 

 criticism of the \ the cilia are more like columnar 

 epithelium. 



There is no tendency to 

 assimilation at present. 

 Will this come with the 

 completion of the cilia? 



At 10.27 a curious occur- 

 rence in b vorticella. A 

 ridge of cilia (?) appears at a. 



Fi,j. 101. 



Fij. 102. 



At 10.29 sharp contraction. Considerable latent 

 period before relaxation. Ciliary wave more rapid. 



10.30 cilia evidently separating. 



10.31 another contraction. Cilia on c completely 

 developed, yet no assimilation, b is now in a position 

 unfavourable for observation. 



10.35 first assimilation by c — a small monad. 



10.45 tne lower belt 

 of cilia on b at a appear 

 very active. Do they 

 assist in the final division 

 of the stalk, and why do 

 they not appear in c? 



Fig. 103. 



Whilst the left-hand vorticella (c) is stationary, 

 b is continually swaying backwards and forwards. 



At 1 1.5 division com- 

 plete as far as cells go. 

 The stalk is at present 

 common property. 



At 11.35 the stem 

 was completely se- 

 parate and then left 

 microscope. 



The difference in the size of the sketches is owing 

 to the fact that sometimes I used the one-eighth as 

 well as the one-fourth. 



J. Herbert Frederick. 



Sidcnp. 



THE EYES OF THE STOMATOrODA. 



By Professor J. Wood-Mason. 



{Superintendent of the Indian Museum.} 



THE following important and highly interesting 

 paper, was recently read before the Micro- 

 scopical Society of Calcutta : 



The eyes are more or less distinctly bilobed in all 

 the Stomatopoda. Of the two lobes into which 

 the eyes are divided, the one is, in relation to the 

 long axis of the animal's body, inner in position, 

 and directed inwards, upwards, and forwards, and 

 the other is outer, and directed outwards, down- 

 wards, and backwards in various degrees in the 

 different genera and species of the order ; so 

 that, if the planes dividing the two lobes from one 

 another are produced downwards, they will meet at a 

 greater or less distance, forming a narrower or wider 

 angle below the long axes of the eyes. While 

 investigating the relations of the interlobar planes of 

 the eyes to the arteroposterior vertical plane of the 

 animal's body and to one another, and studying the 

 form of the eyes generally, in the different genera 

 and species of the group, for taxonomic purposes 

 in connection with my descriptive catalogue of 

 the collection of Malacostracous Crustacea in the 

 Indian Museum at Calcutta, I have come upon some 



