544 SIR CHARLES ELIOT. 



The form is as usual in the genus. The colour uniform dirty yellow. From Bergh's 

 specimens it appears that the living animal is yellow with green branchiae. Frontal veil 

 with 10 simple papillae arranged in three groups, four in the middle and three on each 

 side: outside the latter are the tentacles with a deep groove on the under side. The 

 dorsal surface is covered with minute knobs. The dorsal margin is fairly prominent and 

 bears 11 branchiae on each side, of which the first, tenth and eleventh are rudimentary 

 and the fourth, fifth and sixth the largest. The branchiae are long, arborescent and mostly 

 bipinnate. The rhinophore sheaths are distinctly raised and the rim is irregulai'ly scalloped : 

 the rhinophores as usual, with five pectinated filaments and a simple club. The buccal 

 mass, as usual in this family, is enormous for the size of the animal : the jaws are large 

 and strong and the cutting edge bears a single row of large denticles. The radula also 

 as usual, consisting of about fifty rows of yellow teeth : the formula for each row about 

 45 + 1 + 1 + 1+45. The shape of the median tooth and first side tooth as usual : the 

 laterals diminishing towards the outside. The first stomach lamellated : the second with a 

 girdle of yellow horny plates. There are about 30 large plates and numerous small ones 

 of varying sizes between them. The other internal organs were not well preserved, but did 

 not indicate any deviation from the generic characters. The species is characterized by the 

 appendages on the frontal veil being simple and not branched and by the single row of 

 large denticles on the jaw. 



Fam. Doridoxidae. 



This family was created by Bergh in 1900 {The Danish Ingolf Expedition — Nudihranchiate 

 Gasteropoda — Copenhagen, 1900) to contain a remarkable mollusc di-edged at a depth of 

 55 /. in the North Atlantic. Doridoxa is externally similar to the Dorids in its 

 general shape and rhinophores, but has no external gills whatever and the vent is lateral, 

 not dorsal. The jaws are large and strong: the radula is somewhat as in Tritonia and 

 Bathydoris and consists of a large central tooth with several laterals, of which the innermost 

 differ somewhat in form from the rest. A blood-gland is present and there are two 

 spermatothecas. It is most interesting to find that Mr Gardiner has captured a somewhat 

 similar form at Rotuma in the southern Pacific. The specimen is unfortunately small and 

 the internal organs are hardened into an indistinguishable mass. It is therefore impossible 

 to state whether the animal possesses a blood-gland and a second spermatotheca. If those 

 organs are really absent, it would probably be necessary to make it the type of a new 

 family, but meanwhile its other characters, and in particular the buccal parts, show a close 

 resemblance to Doridoxa. It is however in any case generically distinct from that animal, 

 fi-om which it differs in its round form, smooth back, absence of tentacles and its toothed 

 mandibles. A third gill-less Dorid is the Heterodoris of Verrill, which has the general shape 

 of Triopa, a lateral vent but no mandibles or central tooth. In its external characters it 

 appears to form a good connecting link between Tritonia and the Polyceradae, but in its 

 buccal organs it varies from the former family much more than do the Doridoxidae. 



2. Doridomorpha Gardineri nov. gen., nov. sp. 



One specimen from Rotuma. In the tank received by me this animal was concealed 

 within the epipodia of an Aplysia but the position was no doubt accidental and does not 

 indicate any natural association. The form (fig. 1) is oval and much rounder than Doridoxa, 



