11 



ialt |5 Tverrækker. Mundspaltens Bredde udgjor ikke 

 fuldt Halvdelen at' Afstanden fra Snudespidsen til Lste 



( ijadlespalte. 



Den forreste at' de 5 Gjællespalter ligger i en Afstand 

 fra Mundvinkelen, der omtrent er lig dens egen Afstand 

 fra den bagerste Gjællespalte. 



Spiracula er forholdsvis vid, idet dets Tverdia meter er 

 omtrent lig den ubedækkede Del af Øjet; det er stillet ikke 

 skraat bagenfor dette, men fuldkommen tvers mod Øjets 

 Længdediameter. 



Finnerne. Ventralerne have henimod Spidsen et dybt 

 Indsnit, der fortil lader frit et kegleformigt, noget udspær- 

 ret Parti, der dog er af forholdsvis ringere Hojde. idet det 

 blot udgjor Halvdelen af den hele Finnes Grundlinie, eller 

 omtrent Trediedelen af Finnens hele Længde til den bagre 

 Spidse. 



Iste Dorsal begynder i en Afstand fra Halespidsen, 

 der indeholdes 2 5 / c Gange i Halens hele Længde. Dens 

 Grundlinie er ubetydelig større, end dens Hojde; den bagre 

 Spidse er noget tilspidset. og den lodrette Eagrand lidt 

 concav. 



2den Dorsal er adskilt fra Iste gjennem et ubetyde- 

 ligt Mellemrum (opfyldt af en mindre Torn). Den er lavere, 

 end Iste Dorsal, idet Hojden er kun lidt over Halvdelen 

 af Grundlinien. Dens bagre Spidse er stærkt nedadbojet, 

 dog tilspidset, saaledes. at dens lodrette Bagrand er tem- 

 melig kort, 



En Antydning til en Caudal tindes i Form af en 

 kort og lav. vertical Hudflig, der rager ubetydeligt uden- 

 for Halespidsen. og har paa Halespidsens Underside en 

 kort Kjøl. 



Rudens Béklædning. Oversiden er ru. samt tildels 

 beklædt med større Tome; Undersiden er glat. ■ 



De større Torne findes blot 1) over Øjnene, 2) paa 

 Skulderpartiet, samt 3) midt nedad Ryggen og Halen ; de ere 

 alle riflede fra. Granden udåd mod Spidsen. der er yderst 

 skarp, og noget bagudbøjet; de ere ikke synderlig hoje. 

 undtagen paa Halens øvre Del. Deres samlede Antal er 

 hos det undersøgte Individ 37. 



Øjentornene ere ialt 6 i Antal. og danne paa hver 

 Side en ruldkommen ret Linie (bestaaende af 3 Torne) 

 indenfor Øjeranden. saaledes. at Afstanden mellem begge 

 Linier bliver mindre, end Pandens Bredde mellem Øjnene. 

 Iste Torn er stillet foran. 2den bagenfor Øjets øvre Band. 

 3die umiddelbart bagenfor Spiracula. Iste Torn ligger i 

 en Afstand fra Snudespidsen. der omtrent er dobbelt saa 

 stor. som Bækkernes indbyrdes Afstand; Iste og 3die Torn 

 danne med de tilsvarende i den modsatte Bække et næ- 

 sten fuldkomment Qvadrat. 



Skulderpartiet bærer i Midten en Bække af 3. og 

 paa hver Side en Bække af 2. tilsammen 7 Torne. Side- 

 tornene sidde tættere sammen, end Midtrækkens Tome. og 

 have idethele samme Afstand indbyrdes, som mellem 2den 

 og 3die Øjentorn (14""»). eller noget over en Øjendiameter. 

 Den bagerste Torn i Midtrækken danner med den bagerste 

 Torn i hver af Siderækkerne en næsten ret Linie. Afstan- 

 den mellem Iste og 3die Torn i Midtrækken er næsten saa 



half, the total number of transverse series being thus 

 Width of mouth lint quite e(|ii:il to half the distance li' 



point of snout to iirst branchial aperture. 



The foremost of the five branchial apertures is about 

 the same distance from the angle of the mouth as it is 

 from the hindmost aperture. 



The spiracles are comparatively large, their transverse 

 diameter being uearly equal to the width of the uncovered 

 portion of the eye; their position is not oblique, but strictly- 

 vertical to the longitudinal diameter of the orbit. 



Fins. — Towards their extremity, the ventrals are distin- 

 guished by a deep incision, exposing to view a cuneiform 

 and somewhat expanded part, the height of which however 

 is inconsiderable, being not more than half of the base 

 of the tin. and but one-third of its entire length to the 

 posterior extremity. 



The first dorsal commences at a distance from the 

 tip of the tail which is to the entire length of the tail 

 as 1 to 2 6 / 6 ; basal line a trifle longer than the vertical 

 height; posterior extremity pointed, posterior perpendicular 

 margin slightly concave. 



Second dorsal nearly contiguous to first, the inter- 

 vening space being occupied by a diminutive spine. Height 

 less than that of the first dorsal, hardly exceeding half 

 the length of the basal line ; the posterior extremity directed 

 downwards and terminating in a point; the posterior per- 

 pendicular margin is consequently somewhat short. 



Caudal fin rudimentary, having the appearance of a ver- 

 tical membraneous lappet, furnished on the under surface 

 of the extremity of the tail with a keel-shaped ridge, project- 

 ing but slightly beyond the tip. 



Armature of -the skin. — Upper surface rough and 

 partially studded with powerful spines; under surface smooth. 



The large spines occur: — 1) above the eyes; 2) on 

 the humeral region; 3) along the mesial line of the disk 

 and the central ridge of the tail. All the spines are grooved 

 from the base up to the point, which is exceedingly sharp 

 and slightly hooked ; the longest are in the row on the upper 

 part of the tail. Total number in the specimen examined 37. 



The spines about the eyes are 6 in number, 

 arranged in two lines, perfectly straight (three spines in 

 each), one on either side within the margin of the eye. 

 making the distance between them a trifle less than the 

 width of the interorbital space. The first spine is placed 

 before, the second above the upper margin of the eye. the 

 third immediately behind the spiracles. Distance of first 

 spine from point of snout about double that between the 

 rows; the first and third spines form with the correspond- 

 ing spines on the opposite side an almost perfect square. 



The humeral region is furnished with 7 spines, a 

 row of 3 along the dorsal ridge and 2 on either side. The 

 lateral spines are more closely set than those disposed along 

 the mesial line, their relative distance being nearly equal to 

 that between the second and third spines in the series 

 above the eyes (14"""). or slightly exceeding the longitudinal 

 diameter of the eye. The hindmost spine in the central 

 series is almost in a line with the hindmost spine in each 



