13. IlAl'LODACTYLUS. 435 



4. Haplodactylus arctidens. 



Richards. Proc. Zoul. Soc. 1839, p. 90, and Trans. Zvul. Sue. iii. p. 81. 



D. 16 I y^. A. J. Caec. pylor. 4. Vert. 16/18 (?). 



Incisors lanceolate, without distinct lobes in old age. Six simple 

 pectoral rays. Unifonn brovmish. 



a. Twenty-three inches long: stuffed. Port Arthur. Presented 

 by Sir J. llichardson. — Typo of the species. 



5. Haplodactylus lophodon. (Plate XXIII. fig. B.) 

 B. 5. D. 17 I 20. A.|. L. lat. 78. 



Each incisor mth a terminal lobe and two lateral lobes (on each 

 side). Six simple pectoral rays. Brown : operculum with a black 

 spot behind ; caudal and anal variegated with lighter. 



Coast of New South Wales. 



a. Adult. Sydney. Presented by the College of Surgeons. 



b. Young. New South Wales. Presented by Dr. G. Bennett. 



Description of the specimen. — The greatest height of the body is 3| 

 in the total length, and is below the sixth dorsal spine ; the upper 

 profile of the head and the nape of the neck is rather concave. The 

 head is small, its length being one-fifth of the total ; its upper 

 sui-fiice between the orbits is flat. The snout is obtuse and rounded, 

 not longer than the diameter of the eye, which is more than the 

 distance between the eyes, and one-foiu'th of the length of the head. 

 The cleft of the mouth is narrow, horizontal, situated at the lower 

 part of the snout, which considerably projects above it ; the mouth 

 is very little protractile, and the upper maxillary does not reach to 

 the anterior margin of the orbit. The nostrils are rather remote 

 from each other, and the anterior is furnished with a short membra- 

 naceous appendage. The limbs of the prssopercidum are flexible 

 and skinny, and meet at a rounded angle ; the operculum terminates 

 posteriorly in a point, separated from another shorter one by a deep 

 semicircular notch ; the sub- and interoperculum are narrow. The 

 operclcs and cheeks are covered with minute scales, the other parts 

 of the head being naked. 



The dorsal fin begins in the vertical from the extremity of the 

 operculum ; the spinous portion has the ui)per margin convex, and is 

 continued by the soft one, although the latter is considerably elevated 

 above the posterior spines ; its upper margin is nearly straight, 

 obliquely descending. The fii-st spine is one-half the length of the 

 second, the second one-half of the third ; the follo\\ing incrca.se in 

 length to the sixth, which is nearly one-half of the length of the head. 

 The posterior spines gradually become shorter to the sixteenth and 

 seventeenth, which are equal in length to each other and to the second 

 spine. The second and tliird rays are the longest, rather longer than 

 the sixth spine, the following gradually becoming shorter. There is 

 a pad along all the base of the fin, covered with small scales and 



2f2 



