244 THE VOYAGE OF H.M.S. CHALLENGER. 



36° 44' S., long. 46° 16' W. 2650 fathoms. South Atlantic Ocean, east of 

 the Rio de la Plata. 



5. Specimen showing no fusion of the septa, but with the synapticuke fairly 



developed. Same locality as the foregoing. 



6. Specimen showing a complex transverse connection of the septa, and hyper- 



trophy of synapticulse, and a circular lamina of hard tissue in the centre. 

 Lat. 35° 41' N., long. 157° 42' E. 2300 fathoms. North- West Pacific 

 Ocean. 



7. Specimen, showing a fusion of the septa, and in one of the deltoid spaces a 



development of cancellar hard tissue, but with very few synapticulge. Lat. 

 36° 44' S., long. 46° 16' W. 2650 fathoms. South Atlantic Ocean, east of 

 the Rio de la Plata. 



8, 8a. Upper and under surface of a small adult specimen, showing very regular 



fusions of septa and synapticuke. Off Bermuda. 1035 fathoms. 



9, 9a. Deformed specimen, fractured and reunited. Off Bermuda, 32 fathoms. 



10, 10a, and 11, 11a. Specimens dredged in lat. 13° 50' S., long. 151° 49' E. 



Off the north-east coast of Australia. 



12, 12a. Minute adult specimen dredged in lat. 37" 29' S., long. 27° 31' W. 

 2200 fathoms. South Atlantic Ocean. 



13, 13a. Smallest specimen obtained, dredged in lat. 38° 30' N., long. 31° 14' W. 



1000 fathoms. Off the Azores. 



PLATE XII. 



Figs. 1-3. Heteropsammia multilobata. Off Samboangan, Philippine Islands. 10 fathoms. 



1 . View of upper surface, showing the several calicles. 



2. Side view, showing part of the under surface. At the bottom on the right is 



seen the aperture of the canal occupied by the sipunculid, and above, at the 

 bases of the calicles, a row of pores by which this canal communicates with 

 the interior. 

 Figs. 4-7. Balanophyllia bairdiana. Bass Strait, Australia, 38 fathoms. 



5. Mouth of the calicle of the same. 



6. Young specimen of the same. 



7. Interior of the calicle of foregoing, much enlarged. 



Figs. 8-10. Thecopsammia elongata, attached to a fragment of a Bcdanophi/Uia. Off the 

 Admiralty Islands. 150 fathoms. 

 9. Mouth of the calicle. 

 10. Enlarged view of the outer surface. 



