176 Transactions of the Royal Canadian Institute 



same form that I have taken on the Devonshire coast near the Yealm 

 and Salcombe.* It is not listed by MacFarland. 



Habitat. — ^It has only been recorded once from this district namely 

 from Nanoose Bay on 17, VI, 191 9, where it was present in large num- 

 bers. Over a hundred specimens were taken and hundreds more could 

 have been obtained as they were plentifully distributed in groups of 

 from 3-16 all over the rocks in the sand bar. Although inconspicuous 

 by reason of their markings they were nevertheless easy to find as they 

 were spawning and the spawn is easily seen. It is in the form of a broad 

 ribbon arranged in a compressed coil of from three quarters to one and 

 three quarter volutions. This species characteristically spawns in 

 groups. It would seem as if it were a common form when present but 

 local in distribution. 



Family Dorididae Phanerobranchiatae. 

 Section Goniodorididae. 



Body more or less limaciform, often with appendages. Rhinophores 

 not retractile. Radula extremely narrow (only two or four teeth). 



Genus Idalia (Leuckart). 

 Idalia Leuckart, F. S., "Breves animalium quorundam . . . Descrip- 

 tiones", 1828, p. 15. Alder and Hancock, Mon. British Nud. Mol- 

 lusca, Pt. VII, 1855, Appendix, p. XVIJI. Bergh, Archiv. fur 

 Naturgeschichte, Heft., ii, 1881, pp. 140-181. Eliot, Brit. Nud. Moll., 

 Pt. VIII, 1910, p. 158. 



Body high, foot broad, and prolonged into a tail; Dorsal surface 

 small. Pallial margin prominent and bearing a row of more or less 

 elongate papillae all round. Over the mouth is an oral veil produced on 

 either side into an indistinct tentacular expansion. Rhinophores per- 

 foliate, not retractile. Branchiae simply pinnate, usually rather numerous 

 (ten to eighteen). Penis armed with hooks; prostrate large. Buccal crop 

 sessile. A small labial armature of hooks is present. Formula of radula 

 i-fi, o, i + i. Inner teeth large, hamate, smooth or denticulate; outer 

 small, flat, but generally with indications of a hook or spine. 



Section (a) Idalia sensu stricto in which the centre of the back bears 

 papillae, the labial armature is a ring, and the inner teeth are smooth or 

 minutely denticulate. 



*This I was able to verify during the Summer of 1920. It is the same form 

 that occurs on the British Coast. 



