, NUDIBRANCHIATE GASTEROPODA. 



Iii 1896 were further taken, on 66°35' Lat. N., 2^^' Long. W. (station 129), from a depth of 

 117 faths (temp. 65), 2 specimens, which were strongly distorted by being preserved in alcohol. — 

 They showed here and there strong traces of a purple colour, and had a respective length of 3-5™ 

 and 2 - 3 cm . The common appendages of the frontal veil were reduced to two not very distinctly separ- 

 ated rows of knots or low papillae, and only the lateral ends of the veil projected strongly and in a 

 cleft manner; there was 110 tuft at the base of the simply fingered sheaths of the rhinophores; the 

 larger individual had 6, the smaller one 3 pairs of branchial tufts. 



2. Dendron. arborescens (O. Fr. Midler). 



Sml. R. Bergh, die Nudibranchien des YVillem Barents . 1. c. 1885. p. 25 — t,t,. Taf. II, 



Figs. 12 — 28. 



As well in 1895 as in 1896 several specimens were fished of this species, that is distributed 

 both in the eastern and western parts of the Atlantic, from the Polar sea to the bay of Biscay, and 

 also is found in the Pacific. 



On 66°35' Lat.N., 55°54' Long. W. (station 31) 2 specimens were obtained from a depth of 88 

 faths. (temp. i ? 6j, one of wich had a length of 4 cm , by a height of i'3 cm , and a breadth of 07°'"; in the 

 other specimen the corresponding measures were 2 — c 5 — o - 45 cm . The frontal veil had in the former 

 specimen 12 appendages, in the latter 8; the former had 8, the latter 5 pairs of branchiae. 



On 65°i7' Lat. N., 54°i/' Long. W. (station 34) three individuals were taken from a depth of 55 

 faths. measuring in length 2"4— 2 - 2 — i"3 cm ; the)' had all six pairs of branchial tufts. 



On 65 c 34' Lat. N., 54°3i' Long. W. (station 34), on a depth of 68 faths. (temp. o°2) was finally 

 taken two specimens. One of them was 2 cm long; the other (the frontal veil of which was quite 

 bitten away, and the bulbus pharyngeus laid bare and projecting) measured onlv i'4 cm ; the former had 

 8 appendages on the frontal veil and 7 pairs of branchial tufts, the other only 6. 



All these (7) individuals were of a yellowish white colour. By my earlier examinations I have 

 found, in 13 out of 28 individuals, 8 appendages on the frontal veil, and I never found more than 10 

 appendages; one of the 7 here examined had 12 such. The number of branchial tufts in the earlier 

 examined specimens was generally 6, and did not exceed 7; in one of those here examined, 8 tufts 

 were found on each side. The anal papilla was in these, as in the earlier examined specimens, always 

 situated between the first and the second branchial tuft. 



Fam. Aeolidiadae. 



Subfam. Coryphellidae. 



R. Bergh, System d. nudibranch. Gasteropoden. 1892. p. 1027 — 1029. 



The Coryphellidae have long, simple (not perfoliated) rhinophores [Himatella only forming an 

 exception in this respect). The radula has three series of tooth-plates, and the lateral teeth are denti- 

 culated. The penis is without armature. 



