NUDIBRANCHIATE GASTEROPODA. 



All the holohepatic forms have a liver without side-branches, but a gall-bladder; they 

 have a special blood-gland and two seminal vesicles (spermatheca and spermatocyst ). In the 

 large cladohepatic group, which is very rich in forms, the liver is branched, no blood gland is 

 found, and only one seminal vesicle (spermatocyst). 



Nudibranehiata holohepatiea. 



R. Bergh, System der nudibranchiaten Gasteropodeu "). 



This family comprises only the Dorididae together with the Doriopsidae and the Phyllidiadae 

 as well as the dubious and somewhat deviating Corambidae. Common to all of them — with the single 

 exception of the Phyllidiadae — is the gill which is formed of more or less, single or compound, leaves 

 or tufts, is retractile or not retractile, and is placed in the median line of the back, as well as 

 the position of the anal aperture, which, in consequence of the position of the gill, is found behind 

 in the arch or ring formed by the gill-leaves. 



The Dorididae have a strong bulbus pharyngeus, often provided with labial plates, but almost 

 always (with the exception of the Bathydoridae) wanting real mandibles. 



Dorididae phanerobranchiatae. 

 Fam. Goniodorididae. 



Lamellidoris, Aid. et Hanc. 

 R. Bergh, System der nudibranch. Gasteropoden. I.e. 1892. p. 1152 — 1154. 



This genus, which belongs to the sucking phanerobranchiate Dorididae (the Goniodorididae) is 

 distinguished from the Adalariae, which it resembles very much in outer structure, by the presence of 

 two prominent chitiuous lists below in the inner mouth, and by the narrow radula that has only one 

 outer plate. 



The Lamellidoridae belong almost exclusively to the colder seas. 



Lamellidoris muricata (O. F. Miiller). 



R. Bergh, on the nudibr. gaster. moll, of the north pacific ocean (Scientific res. of the explor. of Alaska. 



Vol.1, art. V — VI), second part. 1880. p. 221 — 224. PI. IX, fig. 18; PI. XI, fig. 10 — 12. 



PI. V, fig. 31—32. 



Of this species two specimens were taken on the 10th of May 1895 at Trangisvaag between 

 Laminarice and red algae. 



The smaller individual was only 6-5 mm long, the larger one, which was examined more closely, 

 measured 9 mm . The colour was whitish with a yellow tinge, the rhinophores were yellow. 



The outer form was the common one; the tubercles on the back were powerful, most of them 

 rather truncate; the rhinophores and tentacles had the common form; the number of gill-leaves was 

 ten, as far as they were to be discerned. 



M Malacolog. Untersuchungen (Semper, Reisen im Archipel der Philippine!!. II, 11). XVIII Heft. 1892. p. 1070— 1 160. 



