MOLLUSCA FROM JUAN FERNANDEZ AND EASTER ISLAND 225 
Genital pore beneath the foremost end of the 4th row. Anus close in front of 
the 4th papilla of the 6th row. 
Radula (fig. 2) with 25 irregularly pectinated teeth, each with about 50 
denticles and measuring 0,2 mm in breadth. 
Jaws with smooth masticatory processes. 
In the general habitus of the animal, the smooth rhinophores, the shape 
of teeth and jaws etc., the present species proves to belong to the genus 
Aeolidia, which has two further representatives in the Peruvian region (de. papil- 
losa and serotina). The present form differs considerably from them in having 
a more slender body, a less number of papillae, and in a more anterior position 

Fig. 1. Aeolidia collaris n. sp. X 5. Fig. 2. Tooth from the radula of 
a anus; g genital pore. Aeolidia collaris n. sp. X 150. 
of the anus; also the radula is different in a smaller number of teeth. Only 
a single specimen was dredged in Cumberland Bay, Masatierra, 20—30 m, °/12 
1916; dimensions: 1. 9, br. of foot 2, height 2,5 mm. 
Juanella n. gen. (Fam. Cadlinidae). 
Back coarsely granular; tentacles triangular, smooth, with grooved external 
margin; glans penis unarmed; labial hooks bicuspidate. 
J. sparsa n. sp. PI. 8, figs 13, 14. — Colour (in alcohol) white, middle 
of the back minutely dotted with grayish-violet, brim of notum with larger 
_ sparse dark-brown ocular spots with a white central point; inferior side white, 
with the peripheral spots translucent, smooth, only veined with branching rays. 
Radula (text-fig. 3) with 54 (+2 incomplete) rows of teeth, with the formula 
20.1.1.1.20; median tooth with a central cusp and 3 lateral denticles; lateral 
teeth with 3 denticles outside the cusp; uncini long, curved and closely denti- 
culated in their margin, the outermost ones erect, long (their length several 
15 — 21197. The Nat. Hist. of Juan Fernandez and Easter Isl. Vol. III: 2. 
