374 NOTES ON SOMK lUMTlsH NUIITHII ANGUS. 



some respects superior. The general colour is transparent white with 

 a faint yellowish tinn;e. The rhinophores and the crest between them 

 are very large and distinctly yellowish. On the back and sides of the 

 body and on the tips of the cerata are very vivid metallic spots which 

 appear blue in some lights and pink in others. There is a streak of the 

 same colour on the tail. The hepatic system is of a deep, rich brown, 

 and its ramifications can be seen clearly through the transparent skin. 



Tlie cerata are very deciduous, and in these specimens many, or even 

 the majority, are quite small and tubercular. These are evidently new 

 growths replacing lost appendages. 



JANOLUS HYALINUR (A. Aj H.). 



(Alder and Hancock, Monog. Brit. Niulih., Fain. 3, pi. 44. Bergh, Mai. 

 Untersurh. in Sempcr's Reisen, vi. 1, }). 8.) 



Two preserved specimens from Plymouth, one 8 mm. long, the other 

 only 4"3 mm. They agree as to external characters with Alder and 

 Hancock's description. The colour is yellowish, with traces of lighter 

 and darker mottlings. The cerata are crowded and irregularly set. 

 There are generally four to five in a transverse row. The innermost are 

 the largest and about 5 mm. high ; they decrease in size outwards, and 

 the outermost are mere tubercles. They bear knobs, as described by 

 Alder and Hancock. The anterior margin of the foot is somewhat un- 

 dulated, with a l)end inwards in the middle. It is not grooved in the 

 ordinary way, but the sides of the head are developed into lappets which 

 extend downwards towards the sides of the foot and form a ridge 

 parallel to them. There is a small fold round the head bearing two 

 distinct tentacles. The rhinophores bear irregular perfoliations which 

 do not go all round the club. The interrhinophorial crest is elongate. 



The jaws are large and smooth, with no denticles. The radula consists 

 of fifteen rows varying from 11.1.11 to 13.1.13. The teeth are hamate 

 and increase in size from the rhachis outwards, the last but one being 

 the largest, and the outermost of all smaller (Fig. 23.). They bear 

 three to five (rarely seven) long ridge-like denticles, which are not 

 very small, but ditlicult to see on account of the extreme transparency 

 of the teeth. These denticles seem to have escaped the notice of both 

 Alder and Hancock (Tongues of the Eolididce) and Bergh, who describe 

 the teeth as smooth. The denticulation is probably varial)le. 



Alder and Hancock's figures of this species {Monograph, pi. 44, figs. 

 8 to 12) are not good, ])ut much better unpublished drawings l)y 

 Hancock are preserved in the Newcastle Museum. 



JANOLUS FLAGELLATUS, sp. 7iov. 

 One specimen from Plymoutii labelled "Aviio2y( hi/alina nr. Eddi/stonc 



