NOTES ON A COLLECTION OF CALIFORNL\N NUDIHRANCHS. 35 



below as C. mwyinafa (?) is certain!)- a Gadlina, but perhaps a new species. 

 Tyrinna, Berifh. from the West Coast of South America has a similar 

 dentition. 



Cadllna flavomaeulata, Mac Fariand 



Mac Fariand : Prelim, account of Darididae of Monterey, pp. 43 — 4. 



Two small specimens from La Jolla, one elongate (8x3 millim) 

 the other almost circular and with an ample margin. Neither are well pre- 

 served and the colours have almost entirely vanished, though it can still be 

 seen that the rhinophores were very much darker than the rest of the animal. 

 The back is tuberculate ; the oral tentacles flat ; the branchiae are about i o, 

 and apparently simply i)innate. The labial armature is yellowish and con- 

 sists of close-set deeply bifid rods. The radula is narrow, the formula being 

 about 90 X 27. I. 27, but many rows are shorter. The central tooth is large 

 and strong, and bears 4 — 5 distinct, long denticles of much the same size. 

 The first laterals are stout, with 2 — 3 denticles on the inner side, and 5 — 6 

 on the outer side of the central cusp. The remaining laterals are denticulate 

 on the outer side only, and near the rhachis bear 12 — 15 minute serrulations 

 whice increase in size and prominence about the middle of the row, so that 

 the teeth of the outer-half have, as Mac Fariand says, a saw-like appearance. 



Cockerell says the living animal which was found in kelp roots washed 

 up on shore was white, with 5 sulphur yellow spots on each side. The 

 rhinophores were very conspicuous dark-reddish brown, with about six per- 

 foliations on each side and white tips. The skin was spiculous, and the oral 

 tentacles short and triangular. 



Externally this species seems characterised by the dark rhinophores, 

 contrasting markedly with the otherwise pale colouration, internally by the 

 large and deeply denticulate central tooth. The simply pinnate branchiae 

 are also noticeable. 



Cadlina marginata, Mac Fariand. (?) 



Mac Fariand : I.e., p. 43. 



Three small specimens from La Jolla are probably referable to this form 

 in virtue of their buccal parts, though none of their external characters 

 can be traced, the animals being much contracted, smooth and of a uniform 

 purplish-grey. 



The labial armature consists of bifid hooks. The radula consists of 

 about 80 rows, containing 40 — 50 teeth on each side of the rhachis. The 

 rhachidian tooth is not conspicuous, and bears 4 — 5 small blunt denticles. 

 The innermost laterals are strongly hooked with 3 denticles on the inner 

 and 6 — 7 on the outer margin. The remaining laterals become longer and 

 slenderer towards the end of the rows, and bear about 1 2 denticles on the 

 outside only. The outermost teeth are rudimentary and irregularly jagged. 



