Dr. Richardson on the Ichthyology of Australia. 15 



as having only two. C. complanata varies much in size, and 

 we have seen a specimen full of ova as small as C. stagnalis is 

 described to be. 



C. hyalina ? We have taken a single specimen of a leech 

 of this family, which nearly agrees with the descriptions of 

 this species. It was more than twice as large as any other in- 

 dividual of this family which we have seen, being about an 

 inch long, of a yellow-brown colour, with two rows of longi- 

 tudinal dark lines upon its back. The whole body was re- 

 markably hard and tough. We saw the proboscis of this ani- 

 mal well developed ; it had no ova or young attached to it. 



REFERENCE TO PLATE I. 



Fig. 1. H. geometra, a pair united, mag. nat. 2. The fore-part of the same, 

 magnified, a, a. White substance. 3. Eggs, mag. nat. 4. Young, 

 idem. 5. Eggs, highly magnified (about 150 linear), b. Lid of the 

 <igg whence the leech escapes. 6. Anterior disc or sucker of the 

 young, free, highly magnified. 8. The same attached. 7. Posterior 

 disc attached. 



Fig. 9, 10, 11. Eggs or capsules with ova of Nepltelis vulgaris. 9. Mag. 

 nat. 10, 11. Magnified. 12. The same, the ova near hatching. 13, 

 14. The same, with the young in the egg just before they come out. 



Fig. 15. Nephelis tesselalal mag. nat., with the young adhering. 16. The 

 same, upper side. 17. One of the young, highly magnified. 



Fig. 18, 19. Clepsina complanata, mag. nat., with the ova attached. 



Fig. 20. C. hyalina t mag. nat. 



III. — Contributions to the Ichthyology of Australia. By 

 John Richardson, M.D., F.R.S., &c.. Inspector of 

 Hospitals, Haslar. 



Mr. Gould having had the kindness to place in my hands 

 for examination a collection of fish, procured by his assistant 

 Mr. Gilbert, at Port Essington, on the north coast of New 

 Holland, I purpose in the following paper to give a summary 

 of my observations thereon, together with a few remarks upon 

 some drawings made by Lieutenant Emery, R.N., of fish 

 captured on the north-west coast of the same countr}^ I 

 shall also introduce several notices of species from Van Die- 

 men's Land and New Zealand, now existing in the museum 

 at Haslar, with the view of enumerating as many Australian 

 fish as the materials in my possession enable me to do. 



Mr. Gilbert's specimens, numbered from 1 to 37? are all 

 dried skins of one side of the fish. The colours of most are 

 consequently altered, and in a few instances the vomerine and 



