5. MOX ACANTHUS. 245 



truncate, the upper lobe slightly produced in old examples ; dorsal 

 and anal fins elevated in front. Ventral spine very small, fixed. 

 Brownish, with two or four whitish longitudinal bauds, the middle 

 of which are broad and naoro distinct than the outer ; sometimes 

 uniform brownish. 

 Australia. 



a. Adult (18 inches long). Sydney. From Mr. Krefft's Col- 



lection. 



b. Young. Port Jackson. From Vr. McGillivray's Collection. 



c. Adult and young : stuffed. Australia. Purchased of Mr. Cuming. 



C Dorsal spine loith irregularly ar.anyvd barbs a> d filaments. 

 23. Moiia,caiithiis penicilligerus. 



Monacanthus penicilligerus, Cuv, Rir/nc An. : Cant. Mai. Fish. 



p. 351 ; Jfullard, Ann. Sc. Nat. 1854, ii. p.' 350, pi. 13. fig. 2 ; 



Bleek. Nat. Tyds. Ned. Ind. xvii. p. 173. 

 spiuosissimus, Quoy ^ Gaim. Voy. Uran. Zool. p. 21 1, pi. 45. 



figs. 3-8. 

 Chaetodermis penicilligerus, Bleek. Atl. Ichth. Balist. p. 129, pi. 221. 



fig. 3. 



D. 26. A. 24. 



Bodj- covered with compi'essed, three-rooted spines, forming irre- 

 gular longitudinal series. Fringed fleshy filaments on the dorsal 

 and ventral spines, head, and body. Body elevated, its greatest 

 depth being contained from once and one-sixth to once and one-half 

 in the total length (without caudal). Tlie origin of the soft dorsal 

 fin is level with, or but little raised above, the base of the dorsal 

 spine. Snout with the upper profile straight or but little concave. 

 Dorsal spine of moderate strength and length, with spinclets irre- 

 gularly arranged ; it is inserted immediately behind the orbit. 

 Caudal fin more or less elongate, especially in old examples. Ventral 

 spine fixed, spiny, projecting beyond the abdominal membrane. 

 Dorsal and anal fins of moderate height. Brownish, irregularly 

 marked ^v•ith darker ; a round black spot in the middle of the side ; 

 some straight black lines along the body and tail. Vertical fins 

 with numerous black dots. 



East-Indian archipelago. Australia. 



a. Adult (10 inches long). Australia. From Mr. Krefft's Col- 

 lection. 

 h. Adult : stuffed. Australia. From Mr. McGillivray's Collection. 



c. Adult : skin. Freyciuet's Harbour. Voyage of the ' Herald.' 



d. Young. Cape York. From Hr. Diimers Collection. 



e. Adult. East-Indian archipelago. From Dr. Bleeker's CoUectiou. 

 /. Adult : skin. Piiiang. From Dr. Cantor's Collection. 



(j-h. Adult ;md young. 



