152 ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
1. TETRODON AEROSTATICUS. Jen. 
T. capite, dorso, lateribus, et pinnd caudali, nigro-maculatis; ventre turgidissimo, 
fasciis obliquis nigris: corpore undique muricato, cauda solum exceptad: capite 
brevi ; fronte inter oculos paululum depresso: maaillis equalibus : lined laterali 
nulld: pinnd dorsali omnino ante analem positd: pinnd caudali subrotundata. 
Die AO C210= Pott: 
Longe. une. 2. lin. 6. 
Form.—Head short. Body approaching to globular, with the skin of the belly extremely loose and 
capable of great inflation; every where beset with minute prickly asperities, the extreme end 
of the tail alone excepted. Crown nearly flat, very slightly depressed between the eyes. 
Jaws equally advanced. Nostrils tubular. No appearance of any lateral line. Dorsal en- 
tirely in advance of the anal: both these fins small. Caudal slightly rounded. 
Cotour.—(Jn spirits.) Head, back, and sides to the depth of the pectorals, greyish brown, spotted 
with black; the spots very small and crowded on the back, but becoming larger on the flanks 
and tail. Belly white, with deep black oblique broad bands, inosculating in some places, so as 
to form large meshes. Dorsal, anal, and pectorals, plain; but the caudal very elegantly and 
distinctly spotted. 
The ticket attached to this specimen has been lost, and its locality is in con- 
sequence unknown. In general appearance, it very much resembles the 7". lineatus 
of Bloch, of which it may possibly be a variety ; but it would seem to differ from 
that species, in having the forehead less elevated; in wanting the lateral line 
altogether, of which I can discover no trace ; and in having the whole back and 
upper part of the sides spotted, and not merely the tail and its fin, as is repre- 
sented in the 7’. lineatus. 
2. TETRODON IMPLUTUS. Jen. 
T. sordidé metallico-olivaceus, maculis circularibus albis ; ventre albo, lineis olivaceis 
longitudinalibus, haud admodum turgido : corpore suboblongo, magnd ex parte levis- 
simo, ventre solum muricato: maxillis subequalibus: naribus tubulosis, bifurcatis : 
lined laterali distinctd, parum tortuosd : pinnd dorsali anali paulo anteriore : pinnd 
caudali equali. 
DAO PAL NO [Chl EG: 
Lone. unc. 4. lin. 9. 
Form.—Approaching to oblong, the belly a little ventricose. Head not so short as in the last 
species, nor yet much produced. Body every where smooth, excepting the middle of the 
abdomen from beneath the pectorals to the vent, and not very prickly here. Top of the head 
slightly depressed between the eyes. Jaws nearly equal; the upper one, if any thing, a very 
little in advance. Nostrils tubular, the tubes forked from the bottom into two equal branches. 
