23 



Hos et noget mindre [ndivid, hvis Totallængde var 



50 og som var optaget Hosten 1S7S fra ISO Favnes 



Dyb ved Rissen i Trondhjémsfjorden af Conserv. Storm, 

 og som blev mig tilsendt til Undersøgelse, var Straale- 

 antallet følgende: D. 19 ((i + 13); A. LO; l'. 15—17-, 

 C. 12. Individet, som opbevares i Videnskabernes Selskabs 

 Samling i Trondnjem, svaiede iøvrigt ganske til de øvrige 

 Individer (med Undtagelse af den ringe Aivigelse i Straale- 

 antallet), og er nærmere omtalt i Forh. Vid. Selsk. Chra. 

 1879. No. 1. p. 11. 



Sidelinie. Denne, der var usynlig hos det 15""" lange 

 Typ-Exemplar, er tilstede hos de større, og fremhæver sig 

 som en ophøjet Stribe mellem Hudens tætte Bekladning af 

 Bentorne. Porerne, der blot er 10 i Antal. ere dog saa 

 smaa. at de kun med nogen Vanskelighed lade sig forfølge 

 i deres hele Række. Sidelinien udspringer ved G-jælle- 

 laagets ovre Ende. stiger strax i skråa Retning ned mod 

 Legemets Midtlinie. som den naar noget bagenfor Analens 

 Begyndelse, og løber derfra uden yderligere Sænkning ud 

 til Cauda len. 



Langs Roden af TJnderkjæven strækker sig paa hver 

 Side en Række af 3 dybe Porer; en lignende Række løber 

 langs Overranden af Overkjæven. ligesom enkelte Porer 

 tindes laugs den nedre Rand af Praeopercuhim. Skjæg- 

 traade paa Kjæverne mangle. 



Hudens Beklæduiiif/. Huden er næsten overalt tæt 

 beklædt med Smaagrupper af yderst tine Bentorne, der 

 især paa Legemets Overside sidde saa tæt, at de næsten 

 ikke lade nogen glat Del af Huden tilsyne. Hver Gruppe 

 har her en rundagtig Omkreds, og er sammensat af omtr. 

 10 Bentorne, der ere yderst lave, saa at Huden blot faar 

 en ru Overfiade. Lige saa tætte og af samme Omfang ere 

 Tornegrupperne paa Gjællelaagene. medens de paa den øv- 

 rige Del af Hovedets Overside have mindre Omkreds. og 

 staa mere spredte. Ligeledes ere de noget mindre paa 

 Legemet nedenfor Sidelinien. 



Paa det egentlige Bugparti mangle disse Ben- 

 tornegrupper næsten ganske bos det største Individ (c), saa- 

 velsom paa hele Hovedets Underside; hos det næststørste 

 Individ (b, Totall. 136'"'") vare de langt færre og mindre 

 paa Bugsiden. og manglede ganske paa Hovedets Underside ; 

 derimod vare Grupperne hos det mindste af de nyerboldte 

 Individer (a, Totall. 93'"'") tilstede overalt paa disse Le- 

 gemsdele lige ben til Underkjævespidsen. og lige saa tæt, 

 som oventil. Hos det tidligere beskrevne Yngel-Exemplar 

 (Totall. 15'""') vare Bentornene blot komne tilsyne paa Ho- 

 vedets 'Overside, og vare i Prembrud paa Bugsiden. men 

 endnu ikke fremkomne paa de øvrige Legemsdele. Herat' 

 synes at kunne udledes, at Ujevnhederne paa Legemets 

 Underside, der fremkomme tidligere, end paa Oversiden, 

 afslides næsten ganske, inden Iudivideme have naaet sin 

 fulde Størrelse. 



Paa Finnerne gaa Bentornene ud langs Straalerne 

 lige til Randen af Dorsalen; paa Pectoralerne beklæde de 

 hovedsagelig de øvre Straaler, ligesom paa Caudalen. Der- 



Ina comparatively small-sized example (total length 50"""), 

 taken in the autumn of L878, at a, depth of 180 fathoms, near 



Rissen, in the Drontheim Fjord, by conservator Storm, and 

 kindly sent me for examination, the fin-ray formula 

 may he thus stated: I). 19 (6 f 13); A. LO; P. 15—17; 

 C. 12. This individual, preserved in the collection of the 

 Videnskabernes Selskab in Drontheim. corresponded in every 



respect with the other individuals (setting aside the slight 

 disagreement in the number of fin-rays), and is more fully 

 described in Forh. Vid. Selsk. Chra. 1879, No. 1. p. 11. 



Lateral Line — The lateral Line, of which there was 

 not even a vestige in the typical and very yoimg specimen 

 (total length 15"""). is distinctly obvious in the larger ex- 

 amples, as an elevated series between the osseous den- 

 ticles of the skin. The pores, not more than 10. are. 

 however, so small that some difficulty is experienced in 

 tracing them throughout the entire length of the series. 

 The lateral line commences at the upper extremity of the 

 gill-cover, strikes off in an oblique direction, and reaches 

 the mesial line a short distance from the commencement of 

 the anal, passing from thence straight to the caudal. 



Along the base of the lower jaw, on either side, is 

 a row of three deep pores; a similar series extends along 

 the superior margin of the upper jaw. and a few pores 

 occur too along the inferior margin of the preoperculum. 

 Cirri on jaws wanting. 



The Skin. — The skin is almost entirely covered with 

 small clusters of granulations, so closely disposed, more 

 particularly on the upper surface of the body, as hardly to 

 leave any smooth portion visible. Each cluster is circular 

 in form, and composed of about 10 spiculæ, exceedingly 

 depressed, giving to the skin merely a rough, or slightly 

 prickly feel. On the opercles. the clusters or groups are 

 disposed in like manner; on the rest of the surface of the 

 bead they present a more scattered appearance, the cir- 

 cumference of each being considerably less. They are 

 somewhat smaller, too, on the body below the lateral line. 



In the abdominal region, as well as on the entire surface 

 of the head, there is scarce a vestige of these clusters in 

 the largest specimen (c); in the specimen next in size (b, 

 total length 136""") they were smaller and far less numer- 

 ous in the abdominal region, and altogether wanting on 

 the under surface of the head; on the other hand, in the 

 smallest of the individuals newly obtained (a, total length 

 93""") they occurred everywhere on those parts of the body, 

 extending to the extremity of the lower jaw. and as closely 

 disposed as on the upper surface. The fry-specimen before 

 described (total length 15""") had denticles on the upper 

 surface of the head only, they were developing on the ab- 

 dominal surface: on the rest of the body they bad not yet 

 begun to appear. From these data may be inferred that 

 the asperities on the under surface of the body, which 

 develop earlier than on the upper, to a great extent get 

 worn away before the fish has attained its lull size. 



( )n the tins, the denticles extend along the rays to the 

 upper margin of the dorsal; on the pectorals, they chiefly cover 

 the rays of the upper part, as also on the caudal. The under 



