572 SIR CHARLES ELIOT. 



right side of head and $ behind it. No jaws: a gizzard attached to the buccal mass: 

 radula ascoglossan : teeth generally denticulate : only a very few functional at a time. 

 Genital apparatus exceedingly complicated. 



There are three genera (I) Phyllohranchus A. and H. Foot undivided : teeth denticulate, 

 forming a spiral in the radula bag. Gizzard long. Vent lateral. Verge unarmed. Recorded 

 from the tropical parts of the Pacific and Indian Ocean and fi-om the Caribbean Sea. 

 (2) Gyerce B. Foot transversely divided: teeth denticulate, forming an irregular heap in 

 bag. Gizzard short. Vent dorsal. Verge armed. Recorded from the tropical Pacific and 

 Indian Ocean. (3) Caliphylla Da Costa. Foot undivided : no oral denticles : teeth not 

 denticulate, forming a spiral in the bag. Vent latero-dorsal. Verge unarmed. Two species 

 from the Mediterranean. It is possible that there may be really a fourth genus, since 

 A. and H. describe their Ph. orientalis as having cerata round the head, apparently like 

 Janus. Bergh thinks this is merely a mistake. 



The present collection contains two specimens referable to Gyerce. There is some doubt 

 as to the relations of the cerata, and the liver in this genus. Pelseneer {I. c. speaking of 

 Gyerce Jheringi, of which I have not seen a detailed description) states that the liver is 

 entirely contained in the visceral mass, and does not extend into the cerata. Bergh (1871) 

 seems satisfied that the papillae do contain hepatic ramifications, though he admits that 

 the structure of the liver is obscure, and that the "hyaline folliculi" in the cerata can only 

 doubtfully be homologised with the contents of the cerata of Phyllobranchus. The present 

 specimens throw no light on the matter. 



34. Gyerce nigra B. 



Two specimens from Miuikoi, which had entirely lost their cerata, only one small 

 detached leaflet being found with them. Apart from this the animals were well preserved 

 externally, but the internal organs were hardened into a uniform mass, in which nothing 

 could be distinguished. What remained of the colour was black with reddish-yellow spots, 

 and lines consisting of a border round the foot, another round the mantle edge, and two 

 lines behind the moderately large pericardial prominence. The body was very plump. The 

 length of the largest specimen 2-1 cm., the breadth 1 cm., the height 9 mm. The oval 

 tentacles small, canaliculate and continuous with the ends of the moderately-large frontal 

 veil, from which a sort of ridge runs down to the anterior margin of the foot. The foot 

 is broad, and very deeply grooved in fi'ont. The transverse division of the under surface 

 is quite distinct, but not very deep. The part of the foot before the division is 5 mm. 

 long. The anal papilla in front of the pericardium large and high. The rhinophores strong, 

 bifid and canaliculate. Of the internal organs nothing could be ascertained except that 

 the teeth are long and denticulate. The single small detached papilla, which was preserved, 

 was black, with a reddish-yellow margin and spots of the same colour on both sides. It 

 may therefore be concluded that at least one and probably both the specimens belonged 

 to the variety ocellata B. 



This collection of Nudibranchs does not in any way indicate that the fauna of the 

 Maldive and Laccadive Islands contains any element foreign to the rest of the Indo-Pacific. 

 All the genera except the very doubtful Staurodoris are typical of this area, and all the 

 species, which are not new, are more or less certainly recorded from it. Two points however 

 are worthy of notice. Firstly, a large number of common and characteristic Indo-Pacific 



