6 Marine Investigations in Soiith Africa. Vol. F.. 



The form of the animal as usual, the fore end of the head rather 

 large, the tentacles proper and the rhinophores rather small, the 

 male genital opening at the root of the (right) head-wing (about 

 9 mm. from the mouth). The seminal furrow very distinct, the 

 vulva rather thick. The mantle a little convex, without hole (to 

 the shell) ; the posterior third of the gill freely projecting, the anal 

 aperture flat, the branchio-pericardial on usual place. The margin 

 on the foot-wings finely crenulated, the foot rounded anteriorly, 

 with pronounced marginal furrow. 



The shell measured (floating in water) 6 cm. in length by a breadth 

 of 4, the height was about 7 mm. ; it was quite cuticular, somewhat 

 yellowish, without trace of calcification, the nuclear part very small 



(fig- 11). 



The cavity of the body extends to the root of the tail. 



The central nervous, system as usual. 



The mouth tube 8 mm. long, grayish, darker on the inside. The 

 bulhus 'pharyngeus 17 mm. long with a breadth of 13 and a height 

 of 12 mm., whitish with gray palate, the thick rasp-sheath forming 

 a prominence on the under side. The mandibles 9 mm. high with a 

 breadth of 4-5 and a thickness of about 0-3, the posterior margin 

 convex, the anterior somewhat concave ; the colour brownish yellow, 

 the anterior half darker; the elements high, rather straight, up to 

 0'3mm. long (tig. 12) with diameter of 0*007 mm. The median part 

 of the palate as usual, the thorns of the lateral parts thin, colourless, 

 somewhat bent, of a height up to 0"20 mm. (fig. 13). The large 

 tongue with brownish yellow rasp ; the whole organ was so hardened 

 that a proper examination was impossible ; the rasp contained per- 

 haps about 30 and the sheath about 12 rows of plates. The median 

 plates could not be seen ; the length of the body of the six outer 

 laterals was 0-04-0-08-0-10-0-20-0-25 and 0-30 mm., and did not 

 seem to be more ; that of the innermost scarcely exceeded 0"25 mm.; 

 the colour of the plates yellow. The lateral plates (tigs. 14-16) nearly 

 of the usual form, with long pointed hook, whose inferior half bore 

 denticles, larger on the outer margin, the upper half with some very 

 fine denticles. The outer plates are much smaller, nearly or quite 

 reduced to the basal plate (tig. 15a). 



The salivary glands a little depressed, yellowish white, about 

 4 cm. long, with a breadth in the anterior part of 2 mm., their duct 

 very short. 



The oesophagus (PL II., tig. la) rather dark gray, 2 mm. long with 

 a breadth of 5. It dilates suddenly in (fig. Ih) the anterior stomach, 

 which is somewhat bent, before smooth, and with some (5) strong 

 circular bands. The length of this rather stiff, somewhat cylindrical 



