18 STMBEANCHID^. 



1. Chilobranchus dorsalis. 



Cheilobranchus dorsalis, liichards. I. c. pi. 30. figs. 1-6. 

 aptenodytum, Richm-ds. I. c. p. 51. 



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



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

 Australia and Van Die'men's Land. 



a. Adult. Penguin Island. Presented by Sir J, Richardson. — 

 lype of Ch. aptenodytum. 



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

 sented by E. Gunn, Esq. 



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

 Sir J, Richardson. — T}^es of the species. 



h, {. Several examples. Australia. 



