46 Marine Investigations in South Africa. Vol. V. 



3. St. calva, Eliot. 



M. africano -indie. 



4. St. ? ijusttdata {Ahv&h&m). 



M. Pacific. 



5. St. ? depressa, E. 



M. africano -indie. 



6. St. ? pecten, E. 



M. africano-indic . 



St. verrucosa (Cuv.). 

 PL XI., figs. 26, 27. 



The single specimen sent had been procured on the shore amongst 

 rocks at St. James. It was unfortunately very hardened. 



The length of the animal was 8 by a breadth of 5 and a height of 

 3 mm. ; the breadth of the gill star 3, the height of the gill-leaves 0-5, 

 the breadth of the l)rim of the back 1-3 mm. ; the bi'eadth of the foot 

 3*5 mm. — The colour yellowish white. 



The form oval, somewhat depressed. The rhinophores protected 

 on each side by a little valva. The back covered all over with small 

 and quite small rounded tubercles of a diameter up to 0*5 mm. ; the 

 gill formed of about 20 (?) simple leaves the protecting valves 

 rather small ; the foot not narrow, the tail rather short. 



The cerebral and pleural ganglia quite distinct, smaller than the 

 roundish pedal. The eyes of a diameter of about 0-12 mm. ; that of 

 the otocysts 0-10, they were packed full of otokonia of a length up 

 to 0-016 mm. The skin (of the back) full of very calcified long 

 spicules of a diameter up to 0-025 mm. ; spicules of the same kind 

 in quantity in the valves, and in the lamellae of the rhinophores. 



The mouth tube 1-5 mm. long. The bulbus pharyngeus together 

 with the very projecting rasp-sheath 3 mm. long ; the lip disc 

 covered by a yellowish cuticle. The tongue with yellowish rasp 

 that contained 12 series of plates and in the sheath 15, the total 

 number of rows thus being 27 ; in the series up to 39 plates.''' The 

 nearly colourless plates of the common hook form (figs. 26, 27) ; the 

 height of the outermost 0-03, the height of the plates rising to 

 0-12 mm. 



* The number of series of plates and the number of plates in the series seem 

 to vary much in the St. verrucosa. In a small series of specimens of the typical 

 form the number of series varied from 40 to 73, with a number of plates in the 

 series from 41 to 95. In the St. bicolor these numbers were 28 to .33 and 33 to 

 36 ; in the St. Januarii the number varied from 39 to 6J and 40 to 65. 



