NOTES ON SOME BRITISH NUDIIJIJANCIIS. 375 



25. vi. 97." As preserved, it is of a uniform dull- white colour, slightly 

 transparent on the back, but elsewhere opaque. The length is 15'5 mm.; 

 the breadth 8; the height to the top of the pericardium 7"5, but the 

 end of the body has burst open, and the hennaphrodite gland is pro- 

 truding. The foot is broad (as much as 9o mm. in one place), with 

 ample and undulated mantle margins. * It is notched in front, and con- 

 nected with the head by two very distinct intermediate fleshy plates. 

 Above them are two small but distinct tentacles, forming the extremi- 

 ties of a narrow oral veil. The rhinophores are straight, cylindrical, 

 moderately stout, and bear irregular but distinctly vertical perfoliations, 

 which often join one another or end abruptly before they reach the 

 summit. Between them is a very distinct crest, consisting of about ten 

 transverse perfoliations, which are themselves crinkled and again 

 perfoliate. 



The only cerata preserved are minute, not more than 1 mm. high, 

 more numerous on the right than on the left, and set in one to two rows. 

 There are also several small cerata in front of the rhinophores. There 

 is no trace of larger cerata, but they have probably been lost and 

 replaced by young ones in the first stages of growth. The anus is 

 niedio-dorsal, set very far back, and cup-like. There appear to be a few 

 tubercles on the broad tail. 



The genital orifices are about 5 mm. from the head and surrounded 

 by strong folds. The verge is exserted and extremely long. It consists 

 of a straight cylindrical column, not tapering, 4 mm. long, and bearing 

 at the end a Hagelliform appendage 5 mm. long, so that the whole organ 

 measures 9 mm. 



The digestive organs are much compressed by the greatly developed 

 reproductive glands and are not very well preserved, but appear to 

 agree with Alder and Hancock's account of Antiopa cristata. The 

 oesophagus is short and opens into a large laminated stomach, from 

 which the intestine runs backwards and which receives the two 

 principal hepatic trunks. Owing to the cerata being minute and rudi- 

 mentary the course of the hepatic diverticula in them cannot be traced ; 

 but beneath the dorsal skin, and especially at the sides, there is a thick 

 network of tubes out of which the hepatic trunks seem to arise. 



The central nervous system is like that described by Dergh for 

 Janolus australis, and the eyes have long connectives. 



The buccal mass is large (5 mm. x 4 mm.) and yellowish white. 

 The jaws bright, deep orange, very thick and strong, as in Janolua 

 hyallnus. The radula consists of fifteen rows, with a maximum formula 

 of 20.1.20. The lateral teeth (Fig. 24. b.) are yellow, hamate, low, with 

 a large, broad ])ase. The median teeth (Fig. 24. a.) are snudl, with a low 

 inconspicuous ii(jul<. No denticulations could be seen. 



