574 GASTROPODA. [0 pisthobranchia. 



hamate and denticulate, hut in this species the upper denticles are 

 strongly developed, and the teeth appear bifid, as in C. hilaris 'and 

 C. panthi'i-inn. (Eliot.) 



3. Chromodoris atopa, Bergh, 1905. 



Chromodoris atopa, Bergh, Semper's Reise Philipp., Malac. Unters., vi, 2, 

 1904 (1905), 73, pi. 5, f. 20-25. 



Form as usual in the genus. Colour whitish, back with 3 longi- 

 tudinal rows of roundish milk-white specks, which are orange in. the 

 living animal ; up to 1-5 mm. in diameter ; there are 3 specks in the 

 middle row, 5 in each lateral row, and on the high sides of the body are 

 about 5 longitudinal rows, but only the specks of the upper rows 

 attain the same size as those on the back, the others are smaller, 

 the lowest mostly of yellow colour. The rhinophores and branchiae 

 are also yellow. Rhinophores and skin of back without spicules. 

 Bmnchice 8, the anal papilla 1 mm. high. Under-side of mantle-flap 

 posteriorly with about a dozen small swellings. Tail extended beyond 

 the body. 



Length, 28 mm. ; breadth, 15 mm. : height, 13 mm. (type specimen, 

 in alcohol). 



Labial armature well developed. Radula consisting of 120 rows, 

 each row containing up to 140 teeth. Rhachis narrow, with small 

 plates. Inner lateral teeth with 4-6 fine denticles on the outer side ; 

 the denticles diminishing in number, and then disappearing on ap- 

 proaching the margins. Details of the other internal organs are to 

 be found in Dr. Bergh' s paper. 



Hab. One specimen, obtained by trawl between Kaipara and New 

 Plymouth (Professor Benham). 



Remarks. This species resembles externally C. albonotata. Bergh, 

 from the Society Islands, but differs considerably in the buccal mass, 

 labial armature, and radula. (Bergh.) 



Genus 7. APHELODORIS. Bergh, 1879. 



Aphelodoris, Bergh, Malak. Blatter (n.f.), i, 1879, 107. Type: A. antil- 

 lensis, Bergh. 



Form of body somewhat resembling Chromodoris. the mantle with 

 frontal and caudal veil, but very narrow at the sides. Foot narrow, 

 rounded in front, with the sides very low. Pockets of the rhinophores 

 with slightly raised margin, the rhinophores as usual. Tentacles short, 

 truncated, grooved on the under-side. The retractile branchiae are not 

 less than 5 in number, usually tripinnate. Dorsal surface smooth. 

 Labial cuticle and genitalia without armature. Teeth of radula hamate. 



(July few species are known. 



Distribution. Antilles, Pacific. New Zealand, Tasmania, and South 

 Africa. 



