372 SIR C. ELIOT ON XUDIBRAXCUS [Dec. 1, 



was marked by a thick line of chocolate with numei'oiis small 

 bright blue blotches. The dorsal siuface was arched and covered 

 with large irregularly shaped tubercles bearing secondary knobs. 



The alcoholic specimen is of a uniform greyish white. It is 

 4-7 centimetres long, 2"9 broad, and 1-9 high. The mai'gins of the 

 rhinophore-pockets are ivaised and smooth. The branchial pocket 

 is not much raised and in itself forms a faii'ly regidar cii'cle, which 

 is, however, somewhat distoited by the surrounding tubercles. 

 The margin, however, is not tuberculate as e. g. in Staurodoris. 

 The branchiae are eight and tiipinnate, the anterior paii- being 

 much larger than the othei'S. The anal papilla is large. The 

 spots at the junction of the foot and mantle appear to be glandular. 

 The foot is grooved and notched in front. On each side of the 

 mouth are two small conical tentacles. There is a labial armature 

 of two small yellowish plates composed of minute rods. The short 

 but very broad radula consists of only 28 rows, containing about 

 65 yellowish teeth on each side of the rhachis. The teeth are 

 hamate ; the innermost fold over the i-hachis : there is an 

 accessory denticle in the four or five outermost, and the outermost 

 of all are smaller and rudely formed. The rej)roductive system is 

 unarmed; there are ample folds surrounding the orifices and a 

 prostate is pi-esent. 



15. Halgerda willeyi, sp. n. (Plate XXXII. fig. 5.) 



One specimen captured by Dr. A. Willey, at Lifu, Loyalty 

 Islands, and kindly given by him to me, seems referable to this 

 genus. It was accompanied by a drawing [vide PI. XXXII. fig. 5) 

 and this note : — " Lifu, Sandal B., 3.10.96. Reddish yellow (rich 

 ochreous) ribbed Doris. The ribs are ochreous and intervening 

 valleys have black linear pigment. Tentacles {i. e. rhinophores) 

 white tipped with black gii'dle. The I'est of ground-colour is dull 

 gr'eyish black. Cloacal rim a dirty white. Foot oi-ange, pi'oduced 

 behind. On passing the hand over branchire so as to produce a 

 shadow they were i-etracted." I have captured an Ophiuroid at 

 Zanzibar, the coloration of which exactly resembled Dr. Wille}''s 

 drawing, so that it is possible that this I'emarkable pattern may be 

 cryptic in cei'tain suri'oundings. 



The preserved animal is considerably shorter and bi'oader than 

 the draAving. The length is 3'1 centimeti'es and the breadth 1-8. 

 The general shape is flat ; the foot long and narrow (2-3 centimetres 

 long by -5 broad), grooved but not cleft in front. The mantle- 

 margin is thin but ample, though a large piece has apparently 

 been bitten out behind. The genei-al consistency is tough and 

 leathery, but thei-e is no rough feeling as in Platydoris. Though 

 smooth to the touch, the back is covered with a series of low lidges 

 and valleys arranged in an elaborate pattern, which will be best 

 under.stood from the figure (PI. XXXII. fig. 5). It starts partly from 

 the mantle-edge and partly from the median doi'sal line, by which it 

 is divided into two pai-ts, though there, is no raised crest. On the 

 dorsal siu'face the ridges ai-e yellowish brown and the valleys black. 

 On the lower surface the coloration is much the same, there beinc 

 [20J 



