200 Transactions of the Royal Canadian Institute 



Head. — The head is short and wide and continued on laterally into 

 two conspicuous oral tentacles which extend forwards and outwards and 

 are constantly in motion while the animal is not moving about. They 

 are white with a few small black spots. 



Foot. — The foot is lanceolate, bilabiate and abruptly rounded in front 

 and continued out laterally into two, not very marked points ; posteriorly 

 it is more sharply pointed. The upper lip is somewhat thicker than the 

 lower but not notched. 



Rhinophores. — The rhinophores are set on the dorsum behind the 

 tips at the front of the foot. They cannot be retracted into a sheath 

 and are directed upwards and slightly laterally. They are of a deep 

 brown colour save for the yellowish white band and transparent tip. 

 The end is quite smooth. 



Cerata. — The cerata are, as noted, numerous and in rows. Each is 

 somewhat curved with the outer side of the arch pointing laterally and 

 capable of considerable distension. They are of a dark brownish gray 

 speckled with opaque white but not white tipped as figured in Alder and 

 Hancock (i Fam. 3, pi. 9). 



Radula. — The pale yellow radula contains 28 rows of teeth each row 

 consisting of one large tooth. Each tooth is crescentric with its inner 

 border smooth and strengthened by a ridge. The outer border bears a 

 lai^e series of long, closely approximated denticles varying from about 

 30 to 46 in number. The central point is marked by a slightly wider 

 space separating the denticles. 



Jaws. — The jaws are well developed and of a brownish yellow colour. 

 Each is in the form of a roundish shallow shell with a strong processus 

 masticorius marked by a series of fine longitudinal striations and rather 

 small crista connectiva. 



This species is a widespread one and if as Eliot suggests (7, p. 

 175) the three species so far described are probably but colour variations 

 of the one species then it is found on the North Western Coasts of 

 Europe; Atlantic North America (fide Alder and Hancock i, Fam. 3, 

 pi. 9) ; Chile and Falkland Islands (as Ae. serotina) ; Port Otway, Pata- 

 gonia; and Santa Barbara, California. The present specimen was ob- 

 tained at False Narrows, 28th June, 1919. 



Habitat. — It does not appear to be a common species near Departure 

 Bay, no other specimens having been recorded. The present one was 

 obtained in a crack on the under side of a stone, well above low tide 

 mark and when collected was laying its eggs. Probably another indi- 

 vidual was also present and smashed in breaking away the rock, for 

 another egg mass was secured and with it a number of cerata and portions 



