576 GASTROPODA. [Opisthobranchia. 



of the mantle the reddish- brown markings are often arranged in more 

 or less interrupted lines. Preserved specimens show various wrinkles 

 and swellings on the dorsal surface. The sheaths of the rhinophores 

 are about 2-5 mm. high, plain and entire, not tuberculate or denti- 

 culate. Rhinophores stout, clavate. completely retractile, strongly 

 laminate, lamina 1 over 20 in number ; they are blotched with dark 

 purple and greenish-yellow ; the tips of the sheaths are usually greenish- 

 yellow. The branchial pocket is surrounded by a flap (preserved 

 specimen), which may have formed a raised border in life ; it is re- 

 flexed and flattened. Near the pocket are some lumps, but these, 

 too. may perhaps be due to distortion. The branchice number 5. 

 rarely 6, forming an incomplete circle round the tubular anus, bipinnate 

 or tripinnate, rounded at the apex, flatly spreading ; colour dark- 

 purplish, sometimes mingled with greenish-yellow ; preserved speci- 

 mens have the branchia? white outside, dull dark-green inside. The 

 two hindermost branchise on either side are deeply cleft, and ac- 

 cording as they are reckoned as one bifid plume or two plumes the whole 

 number will be 5 or 1. Tentacles unusually long, slender, linear, 

 cylindrical, often protruding beyond the edge of the mantle when the 

 animal is crawling ; in preserved specimens they are thick, with a 

 short distinct groove at the tip, and connected with the foot by a 

 fold. Foot large, broad, with thick and high sides ; sole uniform 

 flesh-colour. Its anterior margin is entire and not grooved ; the 

 lateral margin ample ; the tail short. Preserved animals 1m ve the 

 mantle-edge rather narrow, and turned upwards, so as to show the 

 sides of the body. 



Length, 25-50 mm. Length, 33-5 mm. ; breadth, 16 mm. ; height, 

 15 mm. (spirit specimen). 



The labial cuticle shows a white granulation here and there, but 

 no armature. The radula consists of 36 rows, of which three or four 

 in front were short and broken. The rest contain 50-60 hamate teeth 

 on either side of the naked rhachis. The innermost teeth are smaller, 

 with long bases and low hooks. The hook of the first lateral is often 

 flat and irregularly shaped, but no distinct denticulation was seen. 

 The teeth increase in size up to nearly the end of the row ; the last 

 3 or 4 are lower, but not denticulate and not much degraded. (Eliot.) 



Further anatomical details are to be found in Sir Charles Eliot's 

 paper. 



Hob. Auckland Harbour, on rocky ground (Cheeseman). 



RcMtrtrks. The specific name luctuosa is preoccupied in the genus 

 by Bergh. 1905. 



It is possible that this may be the animal described and figured 

 by Basedow and Hedley as Archidoris varia, which has a somewhat 

 similar coloration, a smooth back, grooved tentacles, elevated rhino- 

 phore-sheaths, and a similar radula (23 x 70 + + 70). The shape, 

 however, seems to be different. (Eliot.) 



