<'l<:i'l(AL<l'<>l>A MASSY. 



1 1.") 



(?) O.-lujnix ilii/iiim. Smile-vet, ill Kyil'iux ami Soulryrt, /i. c!t.. p. 1 ' 



1852. 



'I'fi iitiK-tiijillN ijinil/nilllx, llnylc, Mull. MllS. Colllji. Xndi., XL1II. I 



1904. 



Tri iiiin-tn/nix //'.. LII-I us, .la 1 1. -i, < Vt'alnpiiili, Fauna u. Flora (' . \. Ncapcl. Mnno<_;r. L'.'l. pp. I'Ol-'.l, 



pl. 6, )!-. i'; pl. 20, li-s. l is. [896; Merry, Mull. Mur. FMi., XXXII, pp. 281 286, 

 pl. 4!>. li.u's. ::. I, texl 6gs. 8-10, I'.'l I. 



Station sn. oil' Three Kings Islands, surface, 24-mesh net. plankton. Julv L'oth, 

 I'.M 1 . Two ", two $. 



Station 1 1".). otl' Three Kings Islands, surface, square IS-mesh net. plankton. 

 Aug. :2Gth, L911. Two ?. 



These are all young specimens, the two males having a ventral mantle measuring 

 4 mm. and 4'i25 mm. The smallest shows the third right (hectoeotylized) arm coiled 

 round beneath the skin. The females have a mantle measuring 4 to j nun. The 

 largest shows the two aquiferous pores at the base of the dorsal arms, but those on the 

 ventral surface cannot he seen; unless, however, the delicate integument is quite 

 uninjured the pores cannot be discovered. The colour of all the specimens is pale 

 butt, with a few rust-coloured or dark chromatophores on the mantle, and more 

 numerous and very dark chromatophores on the dorsal surface of the head. 1'suallv. 

 though not in one of the specimens, a very lame 

 dark chroma tophore is present at each side of 

 the base of the siphon. The chromatophores on 

 the dorsal surface of the arms in the six examples 

 follow a very definite plan namely, a single row 

 is arranged proximallv, changing into two rows 

 distally. There is also a well-defined row on 

 the outer surface of suckers at each side of t In- 

 arm, and a few are dotted about on the inner 

 surface of the suckers. In the largest specimen fourteen to fifteen suckers are 

 present on each of the third arms, and about forty-two were counted on cadi 

 of the first arms. The web extends dorsally to the fifth sucker, and to the 

 fourth ventrally. On the mantle of this female being slit open the viscera! envelope 

 was found to be much more deeply pigmented with dark chromatophores. both 

 dorsally and ventrally. than the outer surface. The anal aperture has verv long 

 appendages (Fig. 4, a.n/>/>.). The ink-sac is of an elongated flask-shape, and is 

 somewhat deeply imbedded in the liver, which latter has a strong median indentation 

 posteriorly. The nidamental glands, which are dotted with chromatophores, are 

 circular rather than oval, ami are coiled round, and raised up in the centre. The 

 ridged ^rinding pads of the stomach appear like transverse bands glimmering 

 through to the outer surface. Tin- posterior salivary glands are somewhat triangular 

 in outline, the anterior margin being the shortest. The radula (Fig. .'i) of this 

 .-|iecimeu is very like that li^ui-ed by .latta (/>. <//.. pl. _'<>. fig. 14). 



Fit',. 3. TremoctopUS ri<iln<-i n*. railula, 

 X 140. 



