18 STMBKANCHID^. 



1. CMlobranchus dorsalis. 



Cheilobranclius dorsalis, Richards. I. c. pi. 30. figs. 1-5. 

 aptenodvtum, Richards. I. c. p. 51. 



The length of the head is somewhat less than one-half of the 



distance between the giU-opening and the vent. Vert. 21/52. 

 Australia and Van Diemen's Land. 



a. Adult. Penguin Island. Presented by Sii' J. Eichardson. — 

 Type of CJi. apienodijtiim. 



b-c. Fine specimens, 90 millims. long. Van Diemen's Land. Pre- 

 sented by R. Gunn, Esq. 



d-g. Adult and half-grown. North-west Australia. Presented by 

 Sir J. Richardson. — Types of the species. 



h, i. Several examples. Australia. 



