578 GASTROPODA. [Opisthobranchitt. 



KEY TO SPECIES. 



A. Colour yellow ; mantle with well-developed small tubercles ; 



branchiae 5 . . . . . . . . . . . . citrina. 



B. Colour light brown, with large brownish- black specks ; mantle 



with rows of large conical tubercles ; branchiae 6 . . mammo&a, 



1. Doriopsis citrina, Cheeseman, 1881. Plate 36, fig. 5. 



Doridopsis citrina, Chsm., T.N.Z.I., xiii, 1880 (1881), 223 ; Eliot, P. Mai. S., 

 vii, 329, 348. 



Body elliptic-oblong, a little depressed, equally rounded at both 

 ends. Mantle very large, margin thin and almost translucent, wavy ; 

 back covered with numerous well-developed tubercles of rather ir- 

 regular shape and size, and sometimes confluent ; near the margin 

 the tubercles are smaller and the intervals between them larger ; 

 under-surface smooth. Colour usually a pale lemon-yellow, but vary- 

 ing from nearly white to dark orange, always more or less freckled 

 with minute superficial opaque-white specks. The rims of the rhino- 

 phorial and branchial pockets are slightly raised, thin, and not tuber - 

 culate. Rhinophores clavate, upper two-thirds strongly laminated, 

 laminae 19-20. retractile. Branchicr 5, large, ramose, tri pinnate, set 

 round the anus in a circle that is interrupted behind, the two pos- 

 terior the largest and the most branched, the whole retractile. The 

 mantle-margin is fairly ample, and in places shows spicules arranged 

 in a reticulate pattern, but the integuments are thick and not very 

 transparent. The spicules are of various sizes and shapes, such as 

 straight and smooth ; straight with a projection on one side. V-shaped 

 and Y-shaped. Foot oblong, rounded in front and behind, margin 

 thin, even. In some specimens, but not in all, a groove can be seen 

 on its anterior margin. 



Length, 50-75 mm. Length, 24 mm. ; breadth, 18 mm. ; height, 

 7-5 mm. (spirit specimen). 



The anatomy of the animal is described by Sir Charles Eliot. 



Hob. Auckland Harbour, type (Cheeseman) ; Lyttelton Harbour 

 (H. S.). 



Remarks. It is particularly abundant in the winter and spring 

 months. It is usually found in sheltered rocky places, in tide-pools 

 or under stones. The spawn is deposited in the form of a few-coiled 

 spiral, and is generally seen in the months of June, July, and August. 

 (Cheeseman.) 



This form closely resembles D. fulva, MacFarland, from California. 

 If they are identical, Cheeseman's name has priority. (Eliot.) 



2. Doriopsis mammosa, Abraham, 1877. Plate 36, fig. 4. 



Doridopsis mammosa, Abrah., P.Z.S., 1877, 266, pi. 29, f. 20, 21 ; Cheese- 

 man, T.N.Z.I., xiv, 214 ; Eliot, P. Mai. S., vii, 329, 347. 



Body broadly elliptical, the back moderately elevated. Mantle 

 large, usually extending on all sides beyond the foot, margins thin 



