l(j C. ISHTKAWA. 



the sainti fonii as that ul' Liuiiiadia Stanleyana of Sydney, to which it is 

 also ahied in many other res])ects, but the dorsal border of the shell more 

 curved, and forms a more abrupt angle with the anterior edge of the shell 

 than in that species. Oidy three lines of growth visible on the shell. Just 

 as in the Sydney species, the epithelial layer of the matrix of the shell (Fig. 

 5) consists of a pentagonal or hexagonal cells with spherical nuclei, and the 

 pillars of the connective tissue substances form star-shaped fig-ures between 

 which are found numerous blood corpuscles of variable shape and size. In 

 living specimens these corpurcles are seen freely wandering in the blood 

 plasm circulating within the diverticulum of the shell. The shell gland is 

 of exactly the same shapj and structure as in the Sydney species, but is 

 placed further away frouj the anterior border than in that species. 



The colour of the body and the appendages pale watery green. The 

 " Haftorgan " of moderate size. The compound eyes with numerous crys- 

 talline cones, black bordered by brick red. The unpaired frontal eye larg(?, 

 milky white, and in lateral aspect of an irregular triangular shape with its 

 posterior side deeply concave, and situated at the triangular projection of the 

 lower side of the head. The shape of the upper lip is also the same as in 

 the Sydney species. The liver lobes appear to be smaller and more 

 numerous, of an orange colour. The body of the mandible is of the same 

 colour, but its cutting edge sepia brown. The intestinal tract brown. The 

 heart with four ostia on each side. 



The iirst antemia (Fig. 0) a little UKjre half as long as the second, pro- 

 vided with about ten lobes on its frontal edge, each lobe beset with numerous 

 fine olfactory hairs, the length of which being nearly half the height of the 

 largest lobe. '^J'he second antenna (Fig, 4) with eight basal segments and 

 with its upper and lower Flagella each of eight segments, the segments 

 of the lower flagellum being longer than those of the upper. The upper edge 

 of all the segments provided with a number of stiff setae, of which those on 

 the basal segments being longer and hair like, while on the lower edge of the 

 segments of both the flagella are seen two, three, four or live long feathered 

 setae, the longest of which exceeding half the length of the lower flagellum. 

 The mandible and the maxiUa show no structures ])eculier to this si)ecies. 



