372 SIR C. ELIOT ON NUDIBRANCH8 [Dec. 1, 



was marked by a thick line of chocolate with nvimerovis small 

 bright blue blotches. The dorsal surface 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 margins of the 

 rhinophore-pockets are raised and smooth. The branchial pocket 

 is not much raised and in itself forms a fairly regiilar circle, which 

 is, however, somewhat distorted by the surrounding tubercles. 

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

 The branchiae are eight and tripinnate, the anterior pair being 

 much larger than the others. 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 rhachis : there is an 

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

 of all ai'e smaller and rudely formed. The reproductive system is 

 unarmed ; there are ample folds surrounding the orifices and a 

 prostate is present. 



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 dra\\ang {vide PI. XXXII. fig. 5) 

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

 ochreous) ribbed Doiis. The ribs are ochreous and intervening 

 valleys have black linear pigment. Tentacles (^. e. rhinophores) 

 white tipped with black girdle. The rest of ground-colour is dull 

 greyish black. Cloacal rim a dirty white. Foot orange, produced 

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

 shallow they were retracted." I have captured an Ophiuroid at 

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

 drawing, so that it is possible that this remarkable pattern may be 

 cryptic in certain surioundings. 



The preserved animal is considerably shorter and broader than 

 the drawing. The length is 3-1 centimetres and the breadth 1*8. 

 The geneial 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 general 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 ridges 

 and valleys arra,nged in an elaborate pattern, which will be best 

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

 the mantle-edge and partly from the median dorsal line, by which it 

 is divided into two parts, though there is no raised crest. On the 

 dorsal surface the ridges are yellowish brown and the valleys black. 

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



