a fissure penetrating through three-fourths of its depth. 

 The right lobe is the thickest and largest. There are no 

 lobules. The stomach being tender, was torn in the exa- 

 mination, but appears to have been an oblong wide sac, 

 terminating in a narrow intestine, somewhat longer than 

 itself. To this succeeds a valvular colon, which is about 

 as long as the stomach, but rather wider, and lastly, a 

 smooth rectum, a little shorter than the valvular part of 

 the gut. 



The specimen, after being kept in spirits, is reddish- 

 brown on the upper surface, with dark lines, disposed 

 somewhat like the harness of a cart-horse, whence the 

 specific name of ephippiatus. Their exact form may be 

 ascertained more correctly by turning to the figure, than 

 from any description. 



DIMENSIONS. 



Length from snout to tip of tail W7b inches. 



„ „ base of caudal spine 9'26 „ 



„ „ crescentic edge of ventrals be- 

 neath 7-75 „ 



„ „ hinder angles of pectorals 7-52 „ 



axilla of ditto 692 „ 



„ „ fore point of vent 6-55 „ 



„ „ posterior gill-opening 5'65 „ 



„ „ first ditto 2-70 „ 



„ „ mouth 1'68 „ 



„ „ middle of nostrils 1'28 „ 



„ „ centres of spout-holes 2-25 „ 



„ „ centres of orbits 1'90 „ 



Width of free edge of nasal flap 075 „ 



„ between anterior pair of gill-openings 1*82 „ 



„ between posterior ditto 1"19 „ 



Longitudinal diameter of eyes 0-45 „ 



„ „ spout-holes 0-72 „ 



Distance between ditto 1"10 „ 



Breadth of disk 800 „ 



Hab. Storm Bay, Van Diemen's Land. 



Zeus australis. Richardson. 



Radii :— Br. 7 ; D. 10|23 ; A. 4l22 ; C. 134- ; P. 14 ; V. 1 15. 



Plate XXV., fig. 1. 



A single specimen of this fish, in very bad condition, 

 was brought home. The pectoral, ventral and caudal fins 

 are mutilated, and much of the membrane and filaments 

 of the spinous dorsal have disappeared, so that these parts 

 are not to be considered as exactly represented in the 

 figure. 



On comparing the specimen carefully with examples of 

 Zeusfaher, the resemblance of the two species is found to 

 be very great. The Australian fish has, however, propor- 

 tionally shorter and stouter dorsal spines, the soft part of 

 the fin occupying rather more space. The fourth spine is 

 the tallest, while in Zeus faher it is the third. The shields 

 at the bases of the dorsal and anal are more numerous, 

 but much less acutely spinous in Zeus austialis, which 

 possesses seven shields under the soft dorsal, and eight 

 along the corresponding part of the anal, besides angular 

 points at the root of the spines. The thoracic and abdo- 

 minal shields are also scarcely spiniferous, while in faher 

 the thoracic shields have thin, acute, falcate points, and 

 the ventral ones support acute spines. The supra-scapular 

 spine is nearly obsolete in australis, and the coracoid pro- 



cess, above the pectoral, as well as the other angular bones 

 about the head, are less acute. 



The surfaces of the preoperculuin, and of the frontal 

 bones are flat and striated. In Z. faber the former of 

 these bones is strengthened by a smooth, elevated, central 

 rib, and the frontal bones show a thin edge on the upper 

 surface of the head, forming keels, which end in a small 

 spine on each side of the occiput. This point is smooth 

 and flat in australis. 



Length, fourteen inches. 



The specimen is too much decayed to possess any re- 

 mains of colour, and there is no vestige of a lateral spot. 



In the third volume of the ' Zoological Journal,' I de- 

 scribed a Van Diemen's Land fish under the name of Ca- 

 pros australis, from a coloured drawing, executed by a 

 convict in that colony. It is possible that he had the spe- 

 cies described above before him, in which case he has 

 omitted the spinous shields, and thrown the dorsal fin too 

 far back. The drawing was rose-coloured, without a late- 

 ral spot. 



Hab. Port Jackson, Australia. 



Crenidens triglyphus. Richardson. 



Cu. Spec. Cr. dentibus tricuspidatis ; radiis articulari- 



bus pinued dorsi spinas altitudine excedentibus. 



Radii:— Br. 6; D. 15ll2; A. 3|12 ; C. 154; P. 16 ; V. 1|5. 



Plate XXV., fig. 2. 



This fish has the physiognomy of Crenidens forskalii, 

 with the same proportion of height to length, but with a 

 rather less convex profile, and somewhat thinner jaws. 

 The outline of the dorsal fin, and the number of rays of 

 the two species, do not correspond, and there are other 

 diff"erences. 



The suborbitar of Cr. triglyphus is square, with nearly 

 straight edges, and without the small notch at the head of 

 the maxillary which forskalii shows. The scales of the 

 cheek are small, and disappear on the disk of the preoper- 

 culuin and upper border of the gill-cover; the suboper- 

 culum, interoperculum, most of the preoperculuin, and 

 lower part of the operculum, are covered with smooth 

 skin, thickly sprinkled with minute black dots. In the 

 figure of Cr. forskalii, in the Histoire des Poissons (pi. 

 162 quater), the whole operculum, suboperculum, and in- 

 teroperculum, are covered with pretty large scales. The 

 disk of the preoperculum is smooth, and in both species 

 the edge of this bone is transversely furrowed, producing 

 wide, obtuse crenatures. The operculum of Cr. trir/li/phus 

 ends in a thin, flat, acute point, above which the bone 

 slopes away with a slightly concave curve. In oiu- figure, 

 this bony point is represented rather too much like a spine. 

 A row of pretty large scales crosses the supra-scapular 

 region, as in forskalii, but their disks are covered with 

 smaller scales, so that they are rendered inconspicuous. 



There are forty-six scales in a row, between the gill- 

 opening and caudal fin, which are generally oblong, with the 

 base truncated, the two sides parallel to each other, and the 

 apex rounded. A meniscoid segment of the tip of the scale 

 is rough with teeth, the outer ones very acute, and ciliating 

 the edge. Behind this there is a small, smooth rectangle. 



