28 O. NORDGAARD [1915 



dorsal lins are eommencing lo rise out from the dorsal embryo 

 nal fin (pl. I, fig. 3). On the edge of the flaps of the dorsal 

 lin and behind the same at the edge of the dorsal and ventral 

 embryonal fins there are small granular spots, possibly integu- 

 mental glands (pl. I, fig. 3). The distance from point of tail to 

 the posterior dorsal fin is 8 mm. In fig. 7, the embryo is 

 shown in ventral view; n. is heie the nasal furrow, e. eye lobe, 

 m. mouth, N. the umbilical cord, Bf. pectoral fin, .4/'. ventral 

 embryonal fin, /)/'. dorsal embryonal fin. 



A capsule from Gulosen, V 2 1910, capsule 5, conlained an 

 embryo 32 mm. total lenglh. The pectoral fins had here grown 

 out as far as the 4th gill slit. The anal fin is indicated by a 

 greater breadth of the original fold in the skin. It extends from 

 a liltle distance behind the ventral fins to level with the end of 

 the lirst dorsal fin. The granular spots previously mentioned 

 as apparent on the edge of the dorsal fin and behind the same 

 in the dorsal and ventral embryonal fin are now very distinctly 

 marked. The oral aperture is shaped semicircularly. No ocular 

 pigment apparent. Gill threads in 5lh slit now also developed. 

 Distance from point of tail to 2 dorsal fin 10 mm. 



In another capsule, also from Gulosen, February 1909, the 

 total length of the embryo was 40 mm. Here the anal fin was 

 also distinctly marked, extending back almost on a level with 

 the end of the 1 dorsal fin. The pectoral fins had grown for- 

 ward lo the 3rd gill-slit. There are three gill threads in each 

 slit, making 15 on eilher side (pl. I, fig. 4). The ravs in pec- 

 toral and ventral fins distinctly visible. Oral aperture semi- 

 circular. Some of the hinder gill threads are above the pectoral 

 fin, bul as this thrusts forward a loose flap, they are able lo 

 gel to the underside before the pectoral fins grow in delinilely 

 to the side. Distance from point of tail lo 2 dorsal fin 15 mm. 

 No ocular pigment apparent. 



A capsule from Gulosen February 1909 contained an embryo 

 measuring 45 mm. total length. In this, the loose llap of the 

 pectoral fins had grown forward to nearly the 2 gill-slit, Ihe 

 junction of the pectoral (ins with the side extending as far as 

 the oth slit. The gill slits above the loose flaps of the pectoral 

 lins are distinctly visible, hut the ingrowing process, or more 

 properly, perhaps, the growth of the skin over the slits opposite 

 the pectoral flaps is now farther advanced. The ventral fins 

 show a slight incurvation, indicaling division. Mouth a longish 

 oval, trace of pigment formation now apparent in Ihe eye. 

 Anal fin comparatively broad. The most characteristic feature 

 al this slage is the incipient formation of an oral disc, growing 

 out from the sides under the eves and forward under the head. 



